HIOKI ST5540 Leak Current Hitester Instruction Manual
- June 1, 2024
- HIOKI
Table of Contents
ST5540 Leak Current Hitester
“`html
Specifications:
- Model: ST5540
- Product Type: Leak Current HiTESTER
- Edition: Jan. 2021 Revised edition 9 ST5540A981-09 21-01H
Product Information:
The ST5540 Leak Current HiTESTER is a precision instrument
designed for measuring leakage current in various types of
equipment. It provides accurate readings and offers multiple
settings for customization based on the user’s requirements. The
instrument ensures compliance with standards and is equipped with
features to facilitate efficient testing processes.
Product Usage Instructions:
Chapter 1: Overview
1.1 Instrument Overview: Provides an overview of the
instrument’s capabilities.
1.2 Features: Describes the key features of the Leak Current
HiTESTER.
1.3 What is Leakage Current: Explains the concept of leakage
current.
1.4 Leakage Current Measurement Complying with Standards:
Ensures adherence to measurement standards.
1.5 Types of Leakage Current: Discusses the different types of
leakage currents.
Chapter 2: Instrument Labels and Screens
2.1 Instrument Labels and Functions: Details the labels and
functions of the instrument.
2.2 Screen configuration outline: Provides an overview of the
instrument’s screen layout.
2.3 About the Touch Panel: Information about the touch panel
interface.
Chapter 3: Setting Preparations
3.1 Power switch, breaker ON/OFF: Instructions on powering the
instrument.
3.2 Connecting the Power Cord: Steps to connect the power cord
to the instrument and the equipment under test.
3.3 Connecting equipment under test to the instrument:
Guidelines for proper connections.
3.4 Turning Power On and OFF: How to turn the power on and
off.
3.5 Pre-Test Inspection: Checks before conducting
measurements.
Chapter 4: Settings
4.1 Selecting a Network: Instructions on network selection.
4.2 Selecting the Grounding Class of Equipment Under Test:
Guidelines for selecting grounding class.
4.3 Selecting a Measurement Mode: Options for choosing
measurement modes.
4.4 Setting the Measurement Range: Setting the measurement range
as Auto/Hold.
4.5 Setting the Filter: Instructions for setting the filter.
Frequently Asked Questions (FAQ):
-
1. Q: How do I ensure accurate measurements with the ST5540 LeakCurrent HiTESTER?
A: To ensure accurate measurements, make sure to properly
connect the equipment under test to the instrument as per the
instructions provided in Chapter 3. Additionally, calibrate the
instrument regularly as recommended in the maintenance section of
the manual.
-
1. Q: Can I use the instrument for measuring leakage current inhigh-voltage equipment?
A: The ST5540 Leak Current HiTESTER is designed for specific
voltage ranges. Refer to the specifications section for details on
supported voltage levels. Avoid using the instrument outside its
specified voltage range to prevent damage.
“`
ST5540
ST5541
Instruction Manual
LEAK CURRENT HiTESTER
Be sure to read this manual before using the instrument.
When using the instrument for the
first time
Instrument Labels and Functions
p.24
Setting Preparations
p.31
Troubleshooting Maintenance and Service Troubleshooting
p.3
p.281 p.283
Jan. 2021 Revised edition 9 ST5540A981-09 21-01H
HIOKI ST5540A981-09
EN
HIOKI ST5540A981-09
i
Contents
Contents
1
Measurement Flowchart…………………………… 1 Introduction…………………………………………….. 2 Inspection ………………………………………………. 2 Checking the contents of the package ……….. 2 Safety Notes…………………………………………… 3 Usage Notes…………………………………………… 5
Chapter 1 Overview
7
1.1 Instrument Overview ……………… 7 1.2 Features ………………………………. 8 1.3 What is
Leakage Current? ……. 10 1.4 Leakage Current Measurement
Complying with Standards ……. 11 1.5 Types of Leakage Current ……. 12 1.6 Types
of Leakage Current
Measurement ……………………… 13
Chapter 2 Instrument Labels and Screens 23
2.1 Instrument Labels and Functions …………………………………………. 24
2.2 Screen configuration outline …. 27 2.3 About the Touch Panel ………… 30
Chapter 3 Setting Preparations 31
3.1 Power switch, breaker ON/OFF 31
3.2 Connecting the Power Cord ….. 32 Connecting the instrument power cord ……32
Connecting the power cord of the
equipment under test …………………………..33
Making connections to terminals S10,
S12 and S13 ………………………………………35
3.3 Connecting equipment under test to the instrument …………… 36
Connect the terminal …………………………… 36
2 3.4 Turning Power On and OFF …..38 Turning Power On ………………………………. 38 Turning
Power Off ………………………………. 40
3 3.5 Pre-Test Inspection ………………41 Checking measurement frequency ………… 43
Connection/VA check screen ……………….. 44 About the NG Indication ………………………. 44 4
Chapter 4 Settings
47
5 4.1 Selecting a Network ……………..48
4.2 Selecting the Grounding Class of Equipment Under Test ………….49
Registering an Equipment
Name/Control Number ……………………….. 50
4.3 Selecting a Measurement Mode (opens the measurement screen)
………………………………………….. 51
4.4 Setting the Measurement Range (Auto/Hold) ………………………….54
4.5 Setting the Filter …………………..59
4.6 Setting the Allowable Value …..61 Turning lower limit values on and off
for specific
leakage current measurements …………… 63
4.7 Selecting the Type of Target Current ……………………………….64
4.8 Changing the Measurement
Method (Auto/Manual) …………..67 Setting automatic measurement items …… 68
Setting the measurement delay
(delay time) ………………………………………. 70
Setting the measuring time …………………… 73
ST5540A981-09
HIOKI ST5540A981-09
ii
Contents
Chapter 5 Measurement Preparations 75
5.1 Connecting the Test Lead …….. 75 Using L2200 Test Lead ……………………….. 77
Using the 9195 Enclosure Probe
(for measuring enclosure leakage current) 77
Using Alligator Clips
(when using two or three test leads) …….. 78
Chapter 6 Measurements 79
6.1 Making manual measurements 79 6.2 Making automatic
measurements ……………………. 82 6.3 Measurement examples ………. 83
Earth leakage current measurement ……… 83 Touch current measurement ………………… 84
Patient leakage current measurement
(Patient connection – Earth) ………………… 90
Patient leakage current measurement
(external voltage on a SIP/SOP)………….. 93
Patient leakage current measurement
(external voltage on a specific F-type applied part) ……………………………………… 95
Patient leakage current measurement
(external voltage on metal accessible part not protectively earthed)
…………………….. 97
Patient auxiliary current measurement …. 99 Total patient leakage current
measurement
(Patient connection – Earth) ………………. 100
Free current measurement
(Enclosure – Enclosure) ……………………. 101
6.4 Saving Measurement Data (As required) …………………….. 102
Manual measurements ………………………. 102 Automatic measurements …………………… 103
Checking Saved Measurement Data ……. 104 Displaying Saved Measurement Data …..
104 Selecting Saved Measurement Data…… 105 Deleting Saved Data …………………………. 105
6.5 Saving Measurement Conditions
(Panel Save Function) (as required) …………………….. 106 6.6 Printing Measurement
Data (as required) …………………….. 108
Setting up and connecting a printer ……… 108
Chapter 7 Instrument System
Settings
115
System Screen Configuration ……………… 116 7.1 Setting the Mode (Using the
instrument as a voltmeter / measuring protective conductor current)
…………………………….. 117
7.1.1To use the instrument as a voltmeter ……………………………………. 118
7.1.2Measuring protective conductor current……………………………………….. 119
7.2 Panel Load(Loading Saved Measurement Conditions) …… 120
7.3 Initializing the Instrument ……. 121
7.4 Setting the Display Language 123
7.5 Checking Fuses (During Earth leakage current and protective conductor current measurements: Fuse on the relay board ) ……………………………… 124
7.6 Self-Test …………………………… 125
7.7 Power On Polarity Switching (to keep equipment under test on during
polarity switching) ……. 127
Connect the isolation transformer ………… 127 Setting Power On Polarity Switching
……. 128 Relay check 2 …………………………………… 130 7.8 Auto Measure Setting
(set instrument status) ……….. 132
7.9 Setting Lower Limit Values (factor) ………………………………………… 133
7.10 Setting Indication Unit ………… 134
7.11 Setting Date and Time ……….. 135
7.12 Interface Setting (For Communication and Printing) . 136
7.13 Setting the Beep Sound ……… 138
7.14 Setting the Backlight ………….. 139
HIOKI ST5540A981-09
Chapter 8 Controlling the Instrument From a Computer (RS-232C, USB interface)
141
8.1 ST5540/ST5541 Remote Interface Overview (USB connection) ………………. 142
8.2 Connect and be sure to tighten the screws on the connector .. 143
Installation and operation procedures ……145 Specifications of RS-232C
…………………..146 Specifications of USB ………………………….146 8.3 Setting Communication
Conditions on the HiTESTER 147
8.4 Command Message Description ………………………………………… 148
Message Format ………………………………..148 Output Queue and Input Buffer …………….153 Event
Registers ………………………………….154 8.5 Initialization Items ……………… 155
8.6 Message Reference …………… 156 Common Messages ……………………………156 Messages
Specific to the HiTESTER …….156
8.7 Command Message Description ……………………….. 164
Common Messages …………………………… 165 Specific commands ……………………………. 167 8.8 To
Transfer All Saved Data
to a Computer …………………… 245
8.9 Troubleshooting ………………… 246
Chapter 9 External Control 247
9.1 Description of Signals ………… 248
9.2 Connecting to the EXT I/O Terminal …………………………… 249
9.3 Electrical Specifications ……… 251
iii
Contents
11 9.4 Internal Circuit Configuration.. 252
9.5 Timing Chart ………………………253 Panel load function at EXT I/O start …….. 255
9.6 Example of Output Signal Connection ………………………..256
Chapter 10Specifications 257
10.1 Basic Functions ………………….257
10.2 Auxiliary measurement functions* ………………………….258
10.3 Measurement System …………258
5 10.4 Accuracy …………………………..260 Current Measurement Section ……………. 260 Network
Section ……………………………….. 261
6 10.5 Other Functions ………………….263
10.6 System-related Functions ……265
10.7 User interface …………………….266
7 10.8 EXT I/O …………………………….266
10.9 Relay output for medical equipment
(only ST5540) …………………….266
8 10.10 PC Interfaces …………………..267
10.11Printer ……………………………..267
9 10.12General Specifications ……….268
10.13Compliant standards ………….270
10.14Measurement Networks ……..271 Network A (for Electrical Appliance
and Material Safety Law) ………………….. 271
Network B1 (for JIS T 0601-1:1999) …….. 272 Network B2 (for IEC 60601-1:2005
3rd) .. 273 Network C (for IEC 60990) …………………. 274 Network D (for UL)
……………………………. 276 Network E (General-purpose 1) ………….. 277 Network F (General-
purpose 2) …………… 277 Network G (for IEC61010-1) ……………….. 278
10
Appendix Index
HIOKI ST5540A981-09
iv
Contents
Chapter 11 Maintenance and Service 281
11.1 Cleaning and Storage ………… 281 11.2 Repair and Servicing …………. 282 11.3
Replacing Fuses ……………….. 285 11.4 Instrument Disposal …………… 286
Appendix
A1
Appendix1Terminology …………………A1 Appendix2List of instrument status,
other test condition and special test condition……………………..A4 Appendix3List of
default settings ……A7 Appendix4External Dimensions……A29
Index
i
HIOKI ST5540A981-09
1
Measurement Flowchart
Measurement Flowchart
Be sure to read “Usage Notes” (p. 5) before measuring.
The flowchart does not show the detailed procedures but the rough workflow. Connect the power cord
2
See “Connecting the instrument power cord” (p. 32)
See “Connecting the power cord of the equipment under test” (p. 33)
Connecting equipment under test to the instrument
See “3.3 Connecting equipment under test to the instrument” (p. 36)
The actual connection procedure will vary with the power supply of the
equipment under test.
Turn on the power switch of the HiTESTER
See “3.4 Turning Power On and OFF” (p. 38)
Pre-Operation Inspection See “3.5 Pre-Test Inspection” (p. 41)
Settings
See “Chapter 4 Settings” (p. 47) Settings depend on measurement method (Manual
or Automatic) Manual measurement : Perform settings from (p. 48) to (p. 67)
Automatic measurement : Perform settings from (p. 48) to (p. 73)
Turn on the circuit breaker
See “3.1 Power switch, breaker ON/OFF” (p. 31)
Connect test leads See “5.1 Connecting the Test Lead” (p. 75)
Measurements
See “Chapter 6 Measurements” (p. 79) Manual : Free-run measurement
(Measurement conditions can be changed during ongoing measurements) Automatic
: Set measurement conditions and measuring time to perform automatic
measurements.
After automatic measurement ends See “6.4 Saving Measurement Data (As
required)” (p. 102) See “6.5 Saving Measurement Conditions (Panel Save
Function) (as required)” (p. 106) See “6.6 Printing Measurement Data (as
required)” (p. 108)
Turn off breakers and instrument power
See “3.1 Power switch, breaker ON/OFF” (p. 31) See “3.4 Turning Power On and
OFF” (p. 38)
Disconnect test leads and equipment under test
HIOKI ST5540A981-09
2
Inspection
0.1 Introduction
Thank you for purchasing the HIOKI Model “ST5540/ST5541 Leak Current
HiTester”. To obtain maximum performance from the instrument, please read this
manual first, and keep it handy for future reference.
Inspection
When you receive the instrument, inspect it carefully to ensure that no damage
occurred during shipping. In particular, check the accessories and connectors.
If damage is evident, or if it fails to operate according to the
specifications, contact your dealer or Hioki representative.
· Before using the instrument, make sure that the insulation on the test leads
is undamaged and that no bare conductors are improperly exposed. Using the
Model L2200 Test Lead in such conditions could cause an electric shock, so
contact your dealer or Hioki representative for replacements.
· Before using the instrument, make sure that the insulation on the power
cords is undamaged and that no bare conductors are improperly exposed. Using
the instrument in such conditions could cause an electric shock, so contact
your dealer or Hioki representative for replacements.
· Use the original packing materials when transporting the instrument, if
possible.
Checking the contents of the package
Confirm that these contents are provided.
“ST5540/ST5541 Leak Current HiTester”……… 1 Spare fuse for main instrument
…………………… 1 (250 V F50 mAL)
L2200 Test Lead…………………………………….1set (1 red, 1 black)
Power cord (for main instrument)………………… 1
Test lead(red) …………………………………………… 1 (only ST5540)
Power cord for equipment under test …………… 2 Instruction manual…………………………………….. 1 (for [LINE IN])
Enclosure Probe……………………………………….. 1 CD-ROM …………………………………………………. 1
HIOKI ST5540A981-09
Safety Notes
3
Safety Notes
2 This instrument is designed to comply with IEC 61010 Safety Standards,
and has been thoroughly tested for safety prior to shipment. However,
mishandling during use could result in injury or death, as well as damage to
the instrument. Using the instrument in a way not described in this manual may
negate the provided safety features. Be certain that you understand the
instructions and precautions in the manual before use. We disclaim any
responsibility for accidents or injuries not resulting directly from
instrument defects.
This manual contains information and warnings essential for safe operation of
the instrument and for maintaining it in safe operating condition. Before
using it, be sure to carefully read the following safety precautions.
Safety Symbols
In the manual, the symbol indicates particularly important information that
the user should read before using the instrument. The symbol printed on the
instrument indicates that the user should refer to a corresponding topic in
the manual (marked with the symbol) before using the relevant function.
Indicates a fuse.
Indicates a grounding terminal.
Indicates AC (Alternating Current).
Indicates the ON side of the power switch.
Indicates the OFF side of the power switch.
IIndicates that the product conforms to regulations set out by the EU
Directive.
WEEE marking: This symbol indicates that the electrical and electronic
appliance is put on the EU market after August 13, 2005, and producers of the
Member States are required to display it on the appliance under Article 11.2
of Directive 2002/96/EC (WEEE). The following symbols in this manual indicate
the relative importance of cautions and warnings.
Indicates that incorrect operation presents an extreme hazard that could
result in serious injury or death to the user. Indicates that incorrect
operation presents a significant hazard that could result in serious injury or
death to the user. Indicates that incorrect operation presents a possibility
of injury to the user or damage to the instrument.
Indicates advisory items related to performance or correct operation of the
instrument.
HIOKI ST5540A981-09
4
Safety Notes
Other Symbols
See
- (Example) Leakage current
Indicates a prohibited action. Indicates the location of reference
information. Indicates that descriptive information is provided below. For
information on text in italics, refer to “Appendix1 Terminology” (p. A1).
Indicates descriptions relating to the RS-232C only.
USB
Indicates descriptions relating to the USB only.
Accuracy
We define measurement tolerances in terms of f.s. (full scale), rdg. (reading)
and dgt. (digit) values, with the following meanings:
f.s. (maximum display value):
rdg. (reading or displayed value):
dgt. (resolution):
The maximum displayable value. This is usually the name of the currently
selected range.
The value currently being measured and indicated on the measuring instrument.
The smallest displayable unit on a digital measuring instrument , i.e., the
input value that causes the digital display to show a “1” as the least-
significant digit.
Measurement categories
This instrument complies with CAT II (300 V) safety requirements. To ensure safe operation of measurement instruments, IEC 61010 establishes safety standards for various electrical environments, categorized as CAT II to CAT IV, and called measurement categories.
CAT II :
Primary electrical circuits in equipment connected to an AC electrical outlet by a power cord (portable tools, household appliances, etc.) CAT II covers directly measuring electrical outlet receptacles.
CAT III : Prima ry electrical circuits o f heavy equipment (fixed installations) connected directly to the distribution panel, and feeders from the distribution panel to outlets.
CAT IV : The circuit from the service drop to the service entrance, and to the power meter and primary overcurrent protection device (distribution panel).
Using a measurement instrument in an environment designated with a higher- numbered category than that for which the instrument is rated could result in a severe accident, and must be carefully avoided. Use of a measurement instrument that is not CAT-rated in CAT II to CAT IV measurement applications could result in a severe accident, and must be carefully avoided.
HIOKI ST5540A981-09
5
Usage Notes
Usage Notes
Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions.
Use of the instrument should confirm not only to itsspecifications, but also to the specifications of all
accessories, options,and other equipment in use.
2
Avoid the following locations that could cause an accident or damage to the instru-
ment.
Exposed to direct sunlight Exposed to high temperature
In the presence of corrosive or explosive gases
Exposed to water, oil, other chemicals, or solvents Exposed to high humidity
or condensation
Exposed to high levels of particulate dust
Exposed to strong electromagnetic fields Near electromagnetic radiators
Near induction heating systems (e.g., high-frequency induction heating systems
and IH cooking utensils)
Subject to vibration
Avoid obstructing the ventilation holes on the sides of the instrument, as it
could overheat and be damaged, or cause a fire.
If the instrument operates abnormally or displays an abnormal indication, turn
off the power switch immediately, and contact your dealer or Hioki
representative.
Precautions before measurement
· Before turning on the instrument, confirm that the voltage of the power
source matches the voltage specification indicated on the instrument’s power
connector ([AC IN]). (The voltage specification (100, 120, 220 or 240 V)
ordered by the customer is marked with a black dot in the line voltage column
on the rear panel.) Note that using the power supply with improper voltage may
damage the instrument and result in electrical hazards.
· To avoid electrical accidents and to maintain the safety specifications of
this instrument, connect the power cord provided only to a 3-contact (two-
conductor + ground) outlet.
Do not use excessive force on the touch panel, and do not use sharp objects
that could damage the touch screen.
HIOKI ST5540A981-09
6
Usage Notes
Fuse
Connection
· Replace the fuse only with one of the specified characteristics and voltage
and current ratings. Using a non-specified fuse or shorting the fuse holder
may cause a life-threatening hazard. Measurement terminal section : 250 V F50
mAL
· To avoid electric shock, turn off the power switch and disconnect the power
cord and test leads before replacing the fuse.
· Since a blown fuse cannot be repaired or replaced by the customer, contact
your dealer or nearest Hioki sales office. Use the VA check function for power
supply fuse and blown fuse check function for measurement circuit fuse to
check for blown fuses.
· Always turn both devices OFF when connecting and disconnecting an interface
connector and test lead. Otherwise, an electric shock accident may occur.
· To avoid damaging the power cord, grasp the plug, not the cord, when
unplugging it from the power outlet.
· To avoid breaking the test lead or enclosure probe, do not bend or pull
them. · When the power is turned off, do not apply voltage or current to the
measure-
ment terminals. Doing so may damage the instrument. · L (Line), N (Neutral)
and G (Ground) are indicated on the terminal block of the
instrument, and the contacts of the power cord of the device to be measured
are denoted L, N and E (Earth). If the power cord does not include an earth
(E) line, connect only the L and N terminals. For details regarding the
terminal block, refer to “3.3 Connecting equipment under test to the
instrument” (p. 36).
Measurement
To avoid the risk of electric shock when test leads are connected to the T1 –
T3 terminals, do not touch the part of the test lead that is beyond the finger
barrier. The terminals output high voltages in some measurement modes.
Do not touch any part of the test lead beyond the finger barrier
HIOKI ST5540A981-09
Overview
7
1.1 Instrument Overview
Chapter 1 1
Chapter 1 Overview
1.1 Instrument Overview
To ensure the safe use of electrical products, it is necessary to conduct
electrical safety tests such as insulation resistance, withstand voltage,
ground resistance, and leakage current. Complying with laws and standards
regarding medical electrical equipment as well as non-medical electrical
equipment, this instrument can be used to measure leakage current in all types
of electrical products from computers to medical equipment. It consists of
measurement networks that simulate the human body and a high-frequency volt
meter. It is also capable of switching power supply polarities and making
measurements under simulated singlefault conditions in equipment under test.
To simplify leakage current testing, all test operations can be selected and
run from a touch panel on the display screen.
Applicable lines of business and product applications
Manufacturers of medical electrical equipment
Type approval testing, shipment inspection
Dealers of medical electrical equipment
Maintenance, inspection
Service technicians for medical electrical equipment Maintenance, inspection (authorized service technicians)
Clinical engineers, hospitals
Maintenance, inspection
Clinical engineering schools
For educational purposes
Authorized electricians for operating rooms, ICUs, Isolation transformer inspection and CCUs
Public organizations
Type inspection
Manufacturers of general electrical equipment
Type inspection, shipment inspection
Users of general electrical equipment
Maintenance, inspection
General electrical equipment installers
Maintenance, inspection
Service technicians for general electrical equipment Maintenance, inspection
Manufacturers of general electrical equipment parts Type inspection, shipment inspection
Manufacturers of power supply equipment
Type inspection, shipment inspection
Manufacturers of electrical automobiles
Type inspection, shipment inspection
HIOKI ST5540A981-09
8
1.2 Features
1.2 Features
Wide range of measurement networks in compliance with standards and laws
To test electrical equipment for leakage current, it is necessary to use a
measurement network that simulates the human body in compliance with
applicable standards or laws. The instrument includes the 8 measurement
networks below.
1. Network A :For compliance with Electrical Appliance and MaterialSafety Law
2. Network B1 :For JIS T0601-1:1999 IEC62353 (Some measurement modes require
a separate power supply.)
3. Network B2 :IEC 60601-1:2005 3rd Complies with JIS T 0601-1:2017 IEC62353
(Some measurement modes require a separate power supply.)
4. Network C :For IEC60990 5. Network D :For UL 6. Network E :For general-
purpose 1 7. Network F :For general-purpose 2 8. Network G :For IEC 61010-1
The use of these networks enables instrument compliance with other standards.
- Unusable for the differential method defined in IEC 62353.
Leakage current measurement mode
Once a measurement network is selected, the instrument displays a leakage current measurement mode corresponding to the applicable standard or law.
1. Earth leakage current 2. Touch current (Enclosure – Earth) 3. Touch current (Enclosure – Enclosure) 4. Touch current (Enclosure – Line) 5. Patient auxiliary current 6. Patient leakage current (Patient connection – Earth) 7. Patient leakage current (external voltage on a SIP/SOP) 8. Patient leakage current (external voltage on a specific F-type applied part) 9. Patient leakage current
(external voltage on metal accessible part not protectively earthed) 10. Total patient leakage current (Patient connection – Earth) 11. Total patient leakage current (external voltage on a SIP/SOP) 12. Total patient leakage current (external voltage on a specific F-type applied part) 13. Total patient leakage current
(external voltage on metal accessible part not protectively earthed) 14. Free current (Enclosure – Enclosure) 15. Enclosure – Earth leakage current 16. Enclosure – Enclosure leakage current 17. Enclosure – Line leakage current 18. Patient leakage current I 19. Patient leakage current II 20. Patient leakage current III
*SIP(Signal Input Part)/SOP(Signal Output Part)
HIOKI ST5540A981-09
9
1.2 Features
Power on polarity switching function
1
This function makes it possible to continue testing without shutting down the equipment under test when
polarities are changed, which shortens the duration of the test.
(Be sure to use an isolation transformer when using power on polarity switching.)
Chapter 1 Overview
Rated current 20 A
The instrument provides a rated current of 20 A and a rated voltage of 250 V.
Function for checking for blown fuses
The insutrument allows you to check for unintended blown fuses in networks.
Check for blown fuses before and after measurements to enable high-reliability
measurements.
Ease of operation
All operations are performed using the touch panel. The display shows operable
keys and the interactive system guides you through measurement procedures.
Interfaces
The RS-232C, EXT I/O and USB interfaces are provided as standard equipment to
enable the easy transfer of measurement data with a computer. The EXT I/O
connector allows external control.
Printing (with optional printer)
Connect the optional 9442 Printer to print out measurement data and saved
measurement data.
Monitor function
The instrument is equipped with a function to monitor the power supply voltage
and current of equipment under test.
HIOKI ST5540A981-09
10
1.3 What is Leakage Current?
1.3 What is Leakage Current?
High voltage is present in an electrical appliance that uses a commercial
power supply as its main power source. Touching such equipment may expose a
person to an electrical shock when current passes through the body to ground.
This electrical shock is the result of “leakage current” or “touch current.”
Normally, electrical equipment is grounded to protect against electrical
shocks. Current regularly flows through the grounding wire, but should an
abnormality (due to faulty design or fault) occur in equipment, the resulting
electrical shock may cause serious personal injury and sometimes lead to the
death of the victim. For this reason, leakage current measurements including
single-fault conditions1 are strictly regulated. Leakage current measurements
performed according to the applicable standard makes it possible to verify the
safety of equipment. 1What is a single-fault condition? This refers to when
equipment has a fault in a safety protection measure, or a fault that may
result in a hazardous condition. Leakage current testing includes the
following three single-fault conditions.
1. Disconnected grounding wire (not applicable in current tests of leakage
current) 2. One wire in the power cord is disconnected (neutral power supply
wire) 3. External equipment damage2
(patient leakage current II and patient leakage current III) 2 In JIS
T0601-1:1999 classified as a single-fault condition. Not a single-fault
condition, the instrument is capable of switching polarity during measurements
and retaining a recording of the phase with the highest leakage current.
HIOKI ST5540A981-09
11
1.4 Leakage Current Measurement Complying with Standards
1.4 Leakage Current Measurement Complying with Standards
1
Chapter 1 Overview
Electrical safety standards and laws are enacted for electrical products
according to fields of application. Each standard and law specifies a circuit
network for simulating the human body, and prescribes network performance, as
well as measuring locations, type (e.g., AC, DC) of current to be measured,
allowable values, and other characteristics. Listed below are various
standards that require leakage current measurement.
Standards requiring leakage current measurement
Electrical equipment
IEC 60065:2001 +A1:2005
Audio, video, and similar electronic apparatus – Safety requirements
IEC60335-1:2010
Safety of household and similar electrical appliances. – Part 1: General requirements
IEC 60950-1:2005
Safety of information technology equipment
IEC 60990:2016
Methods of measuring touch current and protective conductor current
UL2231-1, UL2231-2
Personnel Protection Systems for EV
Electric measuring instruments
IEC 61010-1:2010
Safety requirements for electrical equipment used in measurements, control and laboratories Current measurement circuits for testing in damp conditions
Medical electrical equipment
JIS T 0601-1:1999 JIS T 0601-1:2017
Medical electrical equipment-Part1:General requirements for basic safety and essential performace
IEC 60601-1:2005 3rd
Medical electrical equipment Part 1: General requirements for safety
Electric measuring instruments (maintenance)
IEC 62353:2014 2.0
Medical electrical equipment Recurrent test and test after repair of ME equipment Method complying with IEC 61010-1
HIOKI ST5540A981-09
12
1.5 Types of Leakage Current
1.5 Types of Leakage Current
Leakage current can largely be classified as shown in the table below.
Types of Leakage Current
Overview
Earth leakage This refers to electric current that flows through a protective earth conductor to
current
the ground.
Touch current Touch current is electric current that flows through a person who touches an
Enclosure leakage current
uflonwgrsotuontdheedheunmcalonsebdodsyeicnticoonnotafcet qwuitihpmanenatp. pItlieddoepsarnt.ot include current that
Patient leakage current
Patient auxiliary current
Total patient leakage current
PaTepasptitleiientedtmlpesaarkvt.aagryebcausrerednotnflothwestythpreouogf haptphleiebdopdayrto. f someone connected to the
Electric current that flows between applied parts and through a patient during normal operation of medical equipment that is not intended to have any physiological effect.
When multiple applied parts are attached to a patient, the total leakage current
must be measured. The sum of patient leakage
current
of
applied
parts
is
total
patient
leakage
cur-
rent.
Protective Electric current that flows through a protective earth conductor (grounding conductor current wire) during normal operating conditions
Reference Page P.13 P.14 P.15 P.15
P.19 P.20
HIOKI ST5540A981-09
Chapter 1 Overview
13
1.6 Types of Leakage Current Measurement
1.6 Types of Leakage Current Measurement 1
Earth leakage current measurement
Class-II equipment does not require the measurement of Earth leakage current
since it has no protective earth conductor. Earth leakage current is measured
by inserting a resistance equivalent to the human body in the protective earth
conductor. Using a clamp (Clamp On HiTester) for measuring current does not
satisfy the standard.
HIOKI ST5540A981-09
14
1.6 Types of Leakage Current Measurement
Touch current measurement
Class-I equipment does not require the measurement of enclosure leakage
current since metal enclosures must be grounded for electrical protection.
However, when the protective earth conductor becomes disconnected (single
fault), the enclosure is no longer grounded for protection and must be
measured. For Class-II equipment, all enclosures are ungrounded for electrical
protection and must be tested. Ungrounded equipment are often made of plastics
and other insulated materials. Since leakage current flows through the human
body, the standard stipulates that a probe is applied to metal foil the size
of a hand pressed against the insulated material. Use the 9195 enclosure probe
supplied with the instrument for measurements involving this instrument. There
are two paths for touch current to flow: “enclosure human body earth” and
“enclosure human body enclosure.” Note that for “enclosure human body
enclosure” to occur a person must touch two electrically isolated (separate)
enclosure sections not two sections on the same enclosure.
HIOKI ST5540A981-09
15
1.6 Types of Leakage Current Measurement
Patient auxiliary current
1
Patient auxiliary current is current that flows through an “applied part human
body applied part” path. Regardless of the medical equipment class, type of
applied parts, and signal input/output selection, all medical equipment with
multiple applied parts must undergo this measurement.
Make both AC and DC measurements for this type of leakage current.
Chapter 1 Overview
Patient leakage current measurement (Patient connection – Earth)
This is electric current that flows through an “applied part human body
ground” path. Regardless of medical equipment class, type of applied parts and
signal input/output section, all medical equipment with patient connections
must undergo this measurement. Make both AC and DC measurements for this type
of leakage current.
HIOKI ST5540A981-09
16
1.6 Types of Leakage Current Measurement
Patient leakage current measurement (external voltage on a SIP/SOP)
This is electric current that flows through an “applied part human body
ground” path. Measure medical instruments with a signal input/output section
and applied parts other than F-type. Measure assuming that medical equipment
with a broken signal input/output section is connected. Instead of connecting
damaged medical equipment to generate a single-fault condition, input a
voltage that is 110% of the rated voltage. (Use the T3 terminal on the
instrument) IEC 60601-1:2005 3rd Edition stipulates that the connection of
damaged medical equipment does not constitute a single-fault condition, but
handles it as a normal condition.
JIS T0601-1:1999 treats patient leakage current II as patient leakage current
I plus a single fault condition.
HIOKI ST5540A981-09
17
1.6 Types of Leakage Current Measurement
Patient leakage current measurement
1
(external voltage on a specific F-type applied part)
This is electric current that flows through an “applied part of malfunctioning medical equipment human body F-type applied part” path. The measurement of this leakage current is required only for medical devices with an F-type applied part. Instead of connecting damaged medical equipment to generate a single-fault condition, input a voltage that is 110% of the rated voltage.
Chapter 1 Overview
HIOKI ST5540A981-09
18
1.6 Types of Leakage Current Measurement
Patient leakage current measurement (external voltage on metal accessible part
not protectively earthed)
Additions to IEC 60601-1:2005 3rd Edition Patient leakage current is current
that takes the following route: “metal accessible part not protectively
earthed applied part human body Earth.” Use this standard to measure medical
equipment with patient connection of applied parts that are not protectively
earthed (B-type or BF-type) and with metal accessible parts that are not
protectively earthed. Instead of connecting damaged medical equipment to
generate a single-fault condition, input a voltage that is 110% of the rated
voltage to metal accessible parts not protectively earthed. (Use the T3
terminal on the instrument) This test is not required for CF-type applied
parts.
HIOKI ST5540A981-09
19
1.6 Types of Leakage Current Measurement
Total patient leakage current measurement
1
Chapter 1 Overview
Total patient leakage current is the total of all leakage current to or from
patient connections of all the same type of applied parts (B-Type, BF-Type and
CF-Type applied parts) simultaneously connected. When there are two or more
patient connections that go to different functions and are not electrically
connected together, the total patient leakage current for B-Type applied parts
must be measured.
If required, measure all patient leakage current components (patient
connection – earth, external voltage on an SIP/SOP, external voltage on an
F-type applied part, external voltage on a metal accessible part that is not
protectively earthed.) (The figure shows patient – earth.)
HIOKI ST5540A981-09
20
1.6 Types of Leakage Current Measurement
Protective conductor current measurement
A protective conductor current measurement measures the electric current that
flows through a protective earth conductor (grounding wire) during normal
operating conditions. Like Earth leakage current, class II equipment does not
have a protective earth wire and therefore does not require measurement of
protective conductor current. To measure the protective conductor current,
place a resistor with a resistance so small as to be negligible in the
protective earth wire circuit.
HIOKI ST5540A981-09
General electrical equipment
21
1.6 Types of Leakage Current Measurement
List of Leakage-Current Measurement Items
Measurement
Normal condition
Singlefault
condition
(Description of fault)
(Other conditions)
1
Touch current Enclosure – Line
Situation other than touch current (Enclosure – Line) is applicable
Chapter 1 Overview
Touch current
·Enclosure – Earth ·Enclosure – Enclosure
1. One wire in the power 1. Functional grounding wire is disconnected
cord is disconnected. 2. Grounding wire for patient connection and power 2. protective earth conduc- supply circuit for measurement are disconnect-
tor is disconnected*
ed
3. A voltage that is 110% of the rated voltage is ap-
plied between an isolated signal input/output
section and earth (Not medical equipment)
Earth leakage current
1. Functional grounding wire is disconnected
1. One wire in the power cord is disconnected.
(Class I only) 2. Grounding wire for patient connection and power
supply circuit for measurement are disconnect-
ed (Class I only)
Patient leakage cur-
rent (Patient connec-
tion – Earth)/
(Patient leakage
current I)
1. One wire in the power cord is disconnected.
2. The protective earth conductor is disconnected.
1 Functional grounding wire is disconnected 2. Grounding wire for patient
connection and power
supply circuit for measurement are disconnected
Patient leakage
current
(external voltage on a
SIP/SOP)/
(Patient leakage
current II)
1. One wire in the power cord is disconnected.
2. The protective earth conductor is disconnected.
1. Functional grounding wire is disconnected 2. Metal accessible part not
protectively earthed
and grounding wire is disconnected 3. A voltage that is 110% of the rated
voltage is ap-
plied between an isolated signal input/output section and earth
Patient leakage cur-
rent (external voltage
on a specific F-type applied part)/
(Patient leakage
current III)
1. A voltage that is 110% of the rated voltage is applied between an
F-applied part and earth. (Does not qualify as a single fault condition under
IEC 60601-1: 2005 3rd Edition.)
2. Metal accessible part not protectively earthed and grounding wire is
disconnected
3. Functional grounding wire is disconnected
Patient leakage cur-
rent (external voltage
on metal accessible
part not protectively
earthed)
1. The protective earth 1. Applied to metal accessible part not protectively
conductor is discon-
earthed
nected.
2. Functional grounding wire is disconnected
Patient auxiliary current
1. One wire in the power
cord is disconnected.
2. The protective earth
Functional grounding wire is disconnected
conductor is discon-
nected.
*Measurement with a disconnected protective earth conductor is applicable only to Class-I equipment.
Medical electrical equipment
HIOKI ST5540A981-09
22
1.6 Types of Leakage Current Measurement
ST5540/ST5541 List of functions
Network Testing leakage current mode
Major functions
item Network A Network B1 Network B2 Network C Network D Network E Network F
Network G
Earth leakage current Touch current
Patient auxiliary current Patient leakage current Total patient leakage
current
Free current Enclosure – Earth leakage current Enclosure – Enclosure leakage
current Enclosure – Line leakage current
Patient leakage current I Patient leakage current II Patient leakage current
III Power on polarity switching function
Rated current 20 A Function for checking for blown fuses
Frequency band switching 110% voltage output terminal (T3 terminal)
S10, S12, S13, E terminal
ST5540
ST5541
HIOKI ST5540A981-09
23
Instrument Labels
and Screens
Chapter 2 2
Chapter 2 Instrument Labels and Screens
HIOKI ST5540A981-09
24
2.1 Instrument Labels and Functions
2.1 Instrument Labels and Functions
Front Panel
1
11 10 9 8
7 6
2 5
3
4
1. Circuit breaker
6. Buzzer
Detects overcurrent in the power line for equipment Generates a beep sound when a key is pressed, and
under test and activates a protective device.
activates a warning buzzer.
(Rated current : 20 A)
See (p. 138)
: ON (for normal measuring operation)
7. Contrast adjustment dial
: OFF (idle condition or when overcurrent
Used to adjust screen contrast.
protection device has been triggered) Turning the dial to the right darkens the display; turn-
See (p. 31)
ing to the left lightens the display.
2. Terminal block cover
Use this dial when the display requires adjustment.
Covers the terminal block to prevent electric shock. 8. 110% voltage output terminal (terminal T3)
Turn the circuit breaker off ( cover. See (p. 37)
3. Terminal block
) before opening the Insulates the voltage supplied to [LINE IN] (p. 25) using the built-in transformer and outputs a 1:1 voltage from terminal T3. Effective only when B1 or B2 network is selected. (only ST5540) See (p. 75)
Outputs voltage based on the power supplied to [LINE IN] (p. 25). Also used to connect the power cord of equipment under test. See (p. 36)
Input 110% of the rated voltage to [LINE IN] (p. 25) using the isolation transformer to use the T3 terminal. The T3 terminal will only output a 110% of the rated voltage when the same voltage is input to [LINE IN].
4. Liquid crystal display unit (LCD)
9. Warning lamp
Five-inch liquid crystal display unit with panel function. Also provided with input key functions.
a
touch
Lights when high volltage is generated at the T1 – T3 terminals.
The backlight (p. 139) can be set to turn OFF auto- 10. Measuring terminals (terminals T1)
matically.
11. Measuring terminals (terminals T2)
5. Power switch
Turns the main instrument ON and OFF. See (p. 38)
Used to measure leakage current other than Earth leakage current. The T2 terminal is provided with a protective fuse. (fuse rating : 250 V, F50 mAL) See (p. 75), (p. 285)
HIOKI ST5540A981-09
Rear Panel
6
5
25
2.1 Instrument Labels and Functions
4
2
Chapter 2 Instrument Labels and Screens
1
3
2
78910
1. Power inlet [AC IN]
7. S10 terminal*
Used for input of the power supply to operate the Terminal for connecting function ground terminal
instrument.
and power supply system for measurement. Con-
Used to connect the power cord provided.
nect to E (earth) for [LINE IN].
2. Power source rating
Enables connection to earth during leakage current measurements. (only ST5540)
Marked with a black dot () in the power line voltage See (p. 35)
specification section.
8. S12 terminal*
3. Inlet for power line of equipment under test Terminal for connecting patient connection to
[LINE IN]
ground for power supply circuit for measurement.
Used for input of the power supply for equipment Connect to E (earth) for [LINE IN].
under test.
Enables connection to earth during leakage current
Used to connect the power cord provided.
measurements. (only ST5540)
(Maximum rating: 250 V/20 A)
See (p. 35)
Correct measurements are not made when no 9. S13 terminal*
voltage is input to [LINE IN]. See (p. 33)
Terminal providing ground connection for metal accessible part not protectively earthed. Connect to
4. EXT I/O connector
E (earth) for [LINE IN]. Enables ground connection
Input/output terminal for external control. (The proper connector is required for connection.) See (p. 247)
during leakage current measurements. (only ST5540) See (p. 35)
5. RS-232C connector
10. E terminal
Used to connect an RS-232C cable or 9444 Con- Connected to E (earth) of [LINE IN].
nection Cable (for the 9442 Printer).
This is a permanent connection that cannot be
(The 9442 Printer, 9444 Connection Cable,
changed.
and other accessories are optional products.) See (p. 141)
- Setting enabled only when B1 or B2 network
6. USB connector
is selected.
Used to connect a USB cable. (The USB terminal provides communication functions but no storage capacity.) See (p. 141)
HIOKI ST5540A981-09
26
2.1 Instrument Labels and Functions
Side Panel
1
2
1. Handle Used to carry the instrument.
2. Stand Used to tilt the instrument.
Take the following precautions to prevent electric shock accidents and damage
to the instrument. · Use M3 screws to attach rack mount brackets after
removing the feet. · When the rack mount brackets are removed to restore the
instrument to its
original condition, be sure to use the original screws. · The screws used must
not penetrate more than 5 mm below the metal panels. · Do not apply heavy
downward pressure with the stand extended. The stand
could be damaged.
HIOKI ST5540A981-09
27
2.2 Screen configuration outline
2.2 Screen configuration outline
The following example shows screens that appear after selecting network A.
(Screens for networks C to
2 G look the same as the screen for network A only the network keys differ.
Due to the larger number of
measurement mode keys, selecting network B1 opens three initial screens and
selecting B2 opens four initial screens.)
Network select screen
Select network to use. (p. 48)
Setting screen of equipment under test
Set up equipment under test.(p. 49)
Chapter 2 Instrument Labels and Screens
Network select screen 1
Network select screen 2
Return to initial screen 1.
Network key
Initial screen 1
measurement mode keys
Return to initial screen 1. Initial screen 2
Go between pages.
System screen
Press to set up the system. (p. 115)
Go between pages.
Measurement screen
Set measurement conditions for the selected measurement mode. (p. 51)
Return to initial screen 1.
HIOKI ST5540A981-09
Return to initial screen 1.
28
2.2 Screen configuration outline
Shared measurement screen displays
The following describes shared measurement screen displays. (Screen example :
Earth leakage current measurement screen)
Result of comparison between maximum value and
allowable value. PASS : Maximum value is equal to or less than
the Upper limit value. FAIL : Maximum value is greater than the Upper
limit value. LOW : Maximum value is equal to or less than
the Lower limit value. Range Up: Measurements exceed the guaranteed accuracy
range.
(PASS or FAIL is not determined) Range Down: Measurements drop below the
guaranteed accuracy
range. (PASS or FAIL is not determined)
Result of comparison between current measurement
value and allowable value. PASS : Current measurement value is equal to or
less than the Upper limit value. FAIL : Current measurement value is greater
than
the Upper limit value. LOW : Current measurement value is equal to or
less than the Lower limit value. Range Up: Measurements exceed the guaranteed
accuracy range.
(PASS or FAIL is not determined) Range Down: Measurements drop below the
guaranteed accuracy range.
(PASS or FAIL is not determined)
Current measurement mode
Maximum measurement value in same measurement item
Measurement conditions at maximum value acquisition
Currently set allowable value
Current measurement value
Current measurement value is minus Current measurement conditions
Selected network Grounding class Equipment name Control number Date
Measurement screen (manual measurement)
HIOKI ST5540A981-09
29
2.2 Screen configuration outline
Key description
Shared keys
Clears the maximum value. Unless this key is pressed, the maximum value is not cleared even if measurement conditions are changed in the same measurement mode.
2
Changing the measurement mode clears the maximum value.
Displays the allowable value setting screen. See “4.6 Setting the Allowable Value” (p. 61)
Chapter 2 Instrument Labels and Screens
The measurement condition setup screen appears. See “4.8 Changing the Measurement Method (Auto/Manual)” (p. 67) Displays the filter setting screen. (When a filter selection is available) Used to turn the filter ON and OFF, or change the setting of the filter. See “4.5 Setting the Filter” (p. 59) Displays the screen for setting the target current. (When an target current selection is available) See “4.7 Selecting the Type of Target Current” (p. 64) Displays the screen for setting the measurement range. Switches the range between Auto and Hold. See “4.4 Setting the Measurement Range (Auto/Hold)” (p. 54) Displays the screen for selecting data to be saved. See “6.4 Saving Measurement Data (As required)” (p. 102)
Starts transmitting data to the 9442 Printer (option). This key is displayed only when the interface setting is set to “Printer”. See “6.6 Printing Measurement Data (as required)” (p. 108)
Exits the currently selected measurement mode, and returns to the system screen.
Specific keys (not displayed for some measurement method)
Applies a high voltage to a test lead connected to the T3 terminal. See “6.3 Measurement examples” (p. 83)
Starts automatic measurements. See “6.2 Making automatic measurements” (p. 82)
During automatic measurement : Stops automatic measurements.
During application
: Stops output of high voltage.
During printing
: Terminates printing.
See “6.2 Making automatic measurements” (p. 82)
See “6.3 Measurement examples” (p. 83)
See “Printing” (p. 111)
Displayed only when the frequency range is set from 0.1 Hz. Press this key to adjust the measurement value. (Measurement values are automatically adjusted when set from 15 Hz.)
Displayed when patient leakage current (patient – earth) and internally powered equipment are selected. See “Measuring the internally powered equipment 1” (p. 91) See “Measuring the internally powered equipment 2” (p. 92)
HIOKI ST5540A981-09
30
2.3 About the Touch Panel
2.3 About the Touch Panel
The HiTESTER uses a touch panel for setting and changing all of the
measurement conditions. Gently touch the black keys on the screen to make
settings and selections. A key turns white and has a concave look when
selected. In this manual, lightly touching a soft key area on the screen is
termed “pressing” a key.
Do not use excessive force on the touch panel, and do not use sharp objects
that could damage the touch screen.
Keys on screen
Selectable keys (Black)
Selected keys (indicated in white and pushed in)
Non-selectable keys (indicated in white and protruding)
Keys whose key captions appear as dotted lines are keys for measurement modes
not required for the selected grounding class.
HIOKI ST5540A981-09
31
3.1 Power switch, breaker ON/OFF
Setting Preparations
Chapter 3
3.1 Power switch, breaker ON/OFF
3
Circuit
ON
OFF
Chapter 3 Setting Preparations
Power switch
ON
OFF
HIOKI ST5540A981-09
32
3.2 Connecting the Power Cord
3.2 Connecting the Power Cord
Connecting the instrument power cord
· Before turning on the instrument, confirm that the voltage of the power
source matches the voltage specification indicated on the instrument’s power
connector ([AC IN]). (The voltage specification (100, 120, 220 or 240 V)
ordered by the customer is marked with a black dot in the line voltage column
on the rear panel.) Note that using the power supply with improper voltage may
damage the instrument and result in electrical hazards.
· To avoid electrical accidents and to maintain the safety specifications of
this instrument, connect the power cord provided only to a 3-contact (two-
conductor + ground) outlet.
To avoid damaging the power cord, grasp the plug, not the cord, when
unplugging it from the power outlet. Preparation items : Power cord for main
instrument
1. Confirm that the main power switch on the front panel of the main
instrument and the circuit breaker are turned off.
2. Connect the power cord to the [AC IN] power inlet on the rear panel of the
main instrument, and insert the power cord plug into a power outlet that
supplies the voltage specified for the instrument.
[AC IN] The ground (G) for the power inlet [AC IN] is a protective earth
conductor and is connected to the enclosure of the instrument.
HIOKI ST5540A981-09
33
3.2 Connecting the Power Cord
Connecting the power cord of the equipment under test
Preparation items : Power cord for equipment under test Isolation transformer
(separately purchased)
Confirm that the main power switch on the front panel of the main instrument
and the circuit breaker are turned off.
3
Chapter 3 Setting Preparations
2. Connect the supplied power cord of the equipment under test to the [LINE
IN] line power terminal block for equipment under test on the rear panel of
the instrument.
3. Connect the plug of the power cord to the isolation transformer. 4.
Connect the isolation transformer plug to a power supply with the voltage
specified by the equip-
ment under test.
2
ENL
Use the screws to secure the connection
ENL
Isolation transformer
4
Secondary side of the Isolation transformer
3
[LINE IN] [AC IN]
· When the power on polarity switching function is used, be sure not to
connect the neutral wire on the secondary side of the isolation transformer to
ground. If it is connected to ground, a ground fault will occur.
· Use a voltmeter or voltage detector to make sure that terminal E [LINE IN]
is at ground potential (approx. 0 V). Failure to make this confirmation could
lead to electric shock or damage the instrument or the equipment under test.
· When connecting the power cord of the equipment under test to the [LINE IN]
terminal, use a cord suitable for the capacity of the equipment under test.
Using a power cord with another rating may result in fire.
HIOKI ST5540A981-09
34
3.2 Connecting the Power Cord
· Use of network B1 or B2 requires the connection of an isolation transformer
capable of outputting a voltage equivalent to 110% of the rated power supply
voltage of the equipment under test.
· When network C is selected, an isolation transformer is required. However,
when the power on polarity switching function is not used, connect the neutral
wire on the secondary side to ground. When the function is used, not to
connect the neutral wire to ground.
· The [LINE IN] and [AC IN] power supplies are isolated from each other. · Use
the cable supplied with the ST5540 and ST5541 instruments to connect
the equipment under test [LINE IN]. Do not connect any other electrical
appliance to this inlet. · The [LINE IN] terminal cannot be used to connect a
single-phase three-wire or center-grounded power supply (for example, a
stabilized power supply). · Nor will the input of 110% of a rated 250 V power
supply voltage be a problem.
Description of isolation transformer
The standard requires that an isolation transformer is used for performing
leakage current measurements. Should the equipment under test break down
during measurements, unforeseen current could be generated resulting in
tripping the earth leakage breaker. Such an event could shut down other
electrical equipment used in the same facility, which could cause a serious
accident. Since an isolation transformer isolates equipment under test from
the earth leakage breaker, equipment breakdown will not have an impact on the
earth leakage breaker or on any other equipment.
Voltage fluctuations of ±10% from the rated supply voltage are taken into
account. Nor will the input of 110% of a rated 250 V power supply voltage be a
problem.
HIOKI ST5540A981-09
35
3.2 Connecting the Power Cord
Making connections to terminals S10, S12 and S13
1. Make sure that the connection to [LINE IN] is correct.
ENL
Use the screws
3
to secure
the connection
E NL
Chapter 3 Setting Preparations
If the wrong connection has been made to [LINE IN], the E terminal may output
the power supply voltage. Since there is then a risk of electric shock, make
sure that the [LINE IN] connection is correct before making connections to the
S10, S12 and S13 terminals.
2. Make connections to S10, S12 and S13 to prepare for a leakage current
test.
S10 terminal S12 terminal S13 terminal
For testing connection of function ground terminal to ground of power supply
system for measurement
For testing connection of patient connections to ground of power supply system
for measurement
For testing connection of metal accessible part not protectively earthed to
ground
Example: Connecting S10 terminal to functional earth terminal
S10 terminal and functional earth terminal
· S10, S12 and S13 are internally connected to the [LINE IN] E terminal (E
terminal is permanently connected to the [LINE IN] E terminal) and correct
measurements are not possible unless a power supply is connected to [LINE IN].
· When you do not know whether the S10, S12 or S13 terminal should be used,
refer to the documentation supplied with the equipment under test.
HIOKI ST5540A981-09
36
3.3 Connecting equipment under test to the instrument
3.3 Connecting equipment under test to the instrument
The actual connection procedure will vary with the power supply of the
equipment under test. A cord to connect the instrument and the equipment under
test is not supplied. Use a power cord that suits the power supply of the
equipment under test.
· To avoid electrical accidents, confirm that all connections are secure. The
increased resistance of loose connections can lead to overheating and fire.
· To avoid electric shock or damage to the equipment, always observe the
following precautions when connecting to external terminals. Always turn off
the power to the instrument and to any devices to be connected before making
connections. Be careful to avoid exceeding the ratings of external terminals
and connectors. During operation, a wire becoming dislocated and contacting
another conductive object can be serious hazard. Make sure that connections
are secure and use screws to secure the external connectors.
· The permissible current for the terminal block is 20 A. Current exceeding
this limit will trip the breaker and shut down the power supply of the
equipment under test.
Connect the terminal
When connecting the HiTESTER to equipment under test with a power cord, use
the terminal block.
· L (Line), N (Neutral) and G (Ground) are indicated on the terminal block of
the instrument, and the contacts of the power cord of the device to be
measured are denoted L, N and G. Connect the wires as shown below. Other
wiring configurations may cause electric shock or damage.
· If the power cord does not include an Ground (G) line, connect only the L
and N terminals.
HiTESTER Terminal block
Power cord (cable case)
E N
L G NL
· When reinstalling the terminal block cover, hang the connected wires
straight down to prevent the wires from being pinched by the cover. Otherwise,
the wires may be disconnected when pinched by the cover.
· To avoid the risk of electric shock and short-circuiting, use the supplied
power cord to connect the measurement line and voltage input terminal.
HIOKI ST5540A981-09
37
3.3 Connecting equipment under test to the instrument
Connecting wires to the terminal block
1 Turn off the instrument and set the breaker to Off. See “Turning Power Off” (p. 40) See “3.1 Power switch, breaker ON/OFF” (p. 31)
2
3
4
Fit the right and left projecting portions of the terminal block cover into the panel slit. Slide the cover downwards until it clicks into place
5
GN L
Clicking
3
sound
Chapter 3 Setting Preparations
Slide upwards
Raise the cover. (The cover will stay in place when raised to a certain height)
Check that the G, N and L terminals are correctly connected and make sure the wires are properly secured Turn on the instrument.
6 Turn on the HiTESTER. See “3.4 Turning Power On and OFF” (p. 38)
G : For grounding wire connection (Class-I equipment only)
N : For neutral wire connection L : For live wire connection
Using a wiring adapter
Obtain and use a wiring adapter as shown below.
Multi-connection adapter, etc.
· Turn off the circuit breaker connecting a wiring adapter or equipment. · The
terminal block continuously output the voltage based on the power sup-
plied to [LINE IN]. Leakage current will increase with the use of multi-
connection adapters, etc.
HIOKI ST5540A981-09
38
3.4 Turning Power On and OFF
3.4 Turning Power On and OFF
Turning Power On
· Before turning on the instrument, confirm that the voltage of the power
source matches the voltage specification indicated on the instrument’s power
connector ([AC IN]). (The voltage specification (100, 120, 220 or 240 V)
ordered by the customer is marked with a black dot in the line voltage column
on the rear panel.) Note that using the power supply with improper voltage may
damage the instrument and result in electrical hazards.
· To avoid electrical accidents and to maintain the safety specifications of
this instrument, connect the power cord provided only to a 3-contact (two-
conductor + ground) outlet.
· Before turning on the power switch, confirm that the circuit breaker is
turned off. Even if the instrument was turned off in fault mode (i.e.,
disconnection of one wire in the power line) at last use, the instrument will
be initialized to normal condition when the power switch is turned on.
Therefore, the terminal block outputs voltage.
· The instrument can operate continuously for 30 minutes at maximum load.
Measurements that continue for longer than 30 minutes may raise internal
temperature and thereby trip the circuit breaker.
HIOKI ST5540A981-09
39
3.4 Turning Power On and OFF
1
4
2
Chapter 3 Setting Preparations
1. Confirm that the circuit breaker is turned off.
3
(If the instrument is turned on when the circuit breaker is
On, the circuit breaker may be triggered.)
2. Turn on the power switch (ON: ) on the front panel.
3. The LCD shows the opening message.Then the wiring
check screen appears.
4. Use the contrast adjustment dial to set the LCD for easy
5. viewing. Turn the circuit breaker On and press
to check
56
Wiring check screen Check again.
wires connected to LINE IN.(
appears only when
6. 7. 8.
9.
wiring is incorrect. Press
for advice.)
Press
to open the fuse check screen.
See “7.5 Checking Fuses (During Earth leakage current and
protective conductor current measurements: Fuse on the
relay board )” (p. 124)
Pressing
in the fuse check screen opens the
relay check screen.
See “Relay Check” (p. 41)
Pressing
in the relay check screen,The network
select screen appears by default.
If the instrument was turned off with the LCD showing
the measurement screen at last use, that measurement
screen appears.
If the instrument was turned off with the LCD showing a
screen other than the measurement screen, the initial
screen appears.
After turning the power on, let the instrument warm up for about 20 minutes before starting measurement oper-
7
Fuse check screen
8
Relay check screen
When “Check at each power ON operation” is enabled on the connection/VA check screen, the connection/VA check screen appears after the power switch is turned on. See .”Inspecting line power supply for the equipment under test” (p. 42) (If the power on polarity switching function was on when the instrument was last turned off, a message to check isolation transformer connection and precautions appear before the wiring check screen.) When the grounding class of the equipment under test is set to internally pow-
ered equipment,
is displayed, and after the initial measurement, the volt-
age value will not be renewed as long as “Renew” is not pressed.
HIOKI ST5540A981-09
40
3.4 Turning Power On and OFF
Turning Power Off
Always turn off the power switch of equipment under test before turning off
power of the instrument to avoid damaging the equipment under test. The
instrument uses an internal relay for switching the power line to equipment
under test and turning off the power switch of the instrument opens all lines
and turns off the equipment under test.
NONormally open
Condition of power line for equipment under test with the main instrument
power switch turned OFF (schematic diagram)
2 3
1. Turn off the power switch of equipment under test connected to the
terminal block. 2. Turn off the circuit breaker. 3. Turn off the power switch
(OFF: ) on the front panel.
When the power switch is turned off, the measurement conditions are saved. In
case of power supply failure (e.g., power outage), the instrument restores the
conditions held immediately before power failure occurred.
HIOKI ST5540A981-09
41
3.5 Pre-Test Inspection
3.5 Pre-Test Inspection
Do not leave any equipment under test connected to the instrument during the
relay check and fuse check (when using any mode other than earth leakage
current mode or protective conductor current mode). The equipment under test
can be subjected to unexpected voltage due to the internal circuit
architecture, damaging the equipment under test.
3
Before using the instrument the first time, verify that it operates normally
to ensure that no damage occurred
during storage or shipping. If you find any damage, contact your dealer or
Hioki representative.
Chapter 3 Setting Preparations
Pre-connection inspection
Does any cable insulation appear damaged, Do not use if damage is present, as you could receive an elec-
or is bare metal exposed?
tric shock. Contact your dealer or Hioki representative if you
Is damage to the instrument evident?
find any damage.
Does the power supply use single-sidegrounded wiring?
When using a center-grounded wiring type power supply (for example, a stabilized power supply), you may not be able to perform all checks accurately.
Power-on confirmation
1 Relay Check
Enables the user to check whether the measurement network and internal circuit
relays work normally.
(1) Press
on the initial screen to display the system screen.
(2) Press
to open the relay check screen.
(3) Press
to start a relay check.
(4) An “OK” appears when the check ends without error.
(5) Press
to return to the system screen.
Relay check screen
3
4
Supply power via [LINE IN] and turn the circuit breaker On as a relay check will otherwise not operate normally. Always confirm this before performing a relay check. Do not connect a device under test during a relay check.
Press
or
to select whether the check
is to be conducted each time power is turned.
An “OK” is displayed See next page.
A “NG” is displayed
A “NG” indication indicates that the measurement network or an internal relay
does not work normally. As the instrument is not in normal working order,
contact your dealer or nearest Hioki sales office.
HIOKI ST5540A981-09
42
3.5 Pre-Test Inspection
2 Fuse inspection (when using modes other than Earth leakage current
and protective conductor current modes: T2-terminal fuse)
For details about the fuse check for the relay board, see “Checking Fuses
(During Earth leakage current and protective conductor current
measurements:”7.5 Checking Fuses (During Earth leakage current and protective
conductor current measurements: Fuse on the relay board )” (p. 124)
The current detection circuit in the instrument contains a fuse. Should the
fuse blow due to incorrect wiring or an over-current condition, the instrument
may no longer be able to detect current. Before use, make sure that the fuse
is not blown.
Required items
· A device for measuring impedance
(for example, a tester)
(1) Select network E in the Network Select screen and select
Enclosure – Enclosure leakage current. (2) Use a tester to measure the
impedance between
the T1 and T2 terminals on the front panel.
Network E : Enclosure-Enclosure leakage current measurement screen
(Or place the tip of test leads connected to the T1 and T2 terminals on the tester to measure.)
(3) Check that an impedance value of 1015 10 is obtained.
When the tester is connected to the T1 and T2 terminals, the instrument measures the leakage current going through the tester.
The impedance is not 1015 10 .
Remove the fuse from the T2 terminal, and directly measure the fuse
resistance.
The impedance is about 15 . (The fuse is not blown.)
The impedance is an overflow
The impedance is not about 15 .
The fuse at the T2 terminal on the front of the instrument may be blown, or a non-specified fuse may be inserted. Replace the fuse. See “11.3 Replacing Fuses” (p. 285)
3 Inspecting line power supply for the equipment under test
Check the line power supply of the equipment under test.
(1) Press
in the initial screen.
(2) Turn on the circuit breaker of the instrument. (p. 31)
(3) Press
to display the connection/VA
check screen.
(4) The check is made automatically.
(5) Press
to return to the system screen.
Supply power via LINE IN and turn the circuit breaker On as a connection / VA check will not otherwise operate normally. Always confirm this before performing a connection / VA check.
Press
or
to select
whether the check is to be conducted
each time power is turned.
An “NG” appears
Inspection complete (When network B2 is selected(p. 43))
Press
to display the screen that shows advice con-
cerning the present condition. According to the displayed
advice, check the current consumption, power cord con-
nection, and other aspects of the equipment under test.
See “About the NG Indication” (p. 44)
HIOKI ST5540A981-09
43
3.5 Pre-Test Inspection
Checking measurement frequency
When network B2 is selected
The frequency range setting of the instrument is 0.1 – 1 MHz allowing the user
to select 0.1 Hz – 1 MHz or 15 Hz – 1 MHz. An 0.1 Hz – 1 MHz setting will slow
down the response of internal circuits and increase measurement time.
Therefore perform the following tests to check the frequency range setting
when using a B2 network. (Default setting: 15 Hz – 1 MHz)
(1) Press
in the initial screen.
3
Chapter 3 Setting Preparations
(2) Press
.
(3) Press
and set a frequency range setting of 0.1 Hz.
(Press
to confirm and return to the system screen.)
(4) The
appears when 0.1 Hz frequency range is set.
Press
and adjust the value
(5) Measure the leakage current of the equipment under test and record the
measured value. (Perform this measurement for 1 or 2 minutes.)
(6) When recording ends, perform operations in step (1) and (2)
again and press
and set a frequency range setting of
15 Hz.
(7) Measure the leakage current of the equipment under test
and compare this value with the value obtained in the 0.1 Hz
– 1 MHz setting.
Unless the two values differ substantially, the customer’s
equipment under test does not produce any leakage current
and the 15 Hz – 1 MHz setting is enough for any subsequent
measurement.
Check the frequency range setting at regular intervals.
· Use the 0.1 Hz setting only for measurements in the B2 network.
· Selecting a network other than the B2 network in an 0.1 Hz setting will
invalidate the 0.1 Hz setting. (The display does not change.)
· The auto range is not available when a 0.1 Hz frequency range setting is
made. Selecting auto range automatically sets the hold range. (during ACpeak
measurements: 1.000 mA range; during AC/DC/AC+DC measurements: 500.0 A range)
· Setting the frequency range to 0.1 Hz in voltmeter mode engages the hold
range (500.0 mV range).
· Setting the frequency range to 0.1 Hz when ACPeak is selected in leakage
current meter mode selects ACDC.
· The CAL key appears when 0.1 Hz frequency range is set. See “Specific keys
(not displayed for some measurement method)” (p. 29)
HIOKI ST5540A981-09
44
3.5 Pre-Test Inspection
Connection/VA check screen
Indicates the voltage of power supplied to [LINE IN].
Indicates the current consumption of the equipment under test.
Indicates the power consumption.
Measures voltage between the terminals of [LINE IN] to check the polarity. Indicates the voltages between phase L and terminal G and between phase N and terminal G on the terminal block.
Press
or
to select whether the check is to
be conducted each time power is turned.
Check again.
When the grounding class of the equipment under test is set to internally pow-
ered equipment,
is displayed, and after the initial measurement, the volt-
age value will not be renewed as long as “Renew” is not pressed.
About the NG Indication
1. If the result of a check is judged not normal, an “NG” indication appears to the right of the corre-
sponding item, along with a
key for the display of details.
(In the screen example shown on the below, the voltage is not normal (NG).)
2. Press
to display the screen that shows advice concerning the present condition. According
to the displayed advice, check the current consumption, power cord connection, and other
aspects of the equipment under test.
The polarity check’s
key may be displayed for uninterrupted polarity
switching wiring but does not indicate a problem with the wiring. When the unin-
terrupted polarity switching function has been enabled, an uninterrupted perfor-
mance check (uninterrupted polarity switching wiring check) is performed before
measurement to check the wiring.
HIOKI ST5540A981-09
45
3.5 Pre-Test Inspection
Check examples (1) If the voltage check results in NG
· Check the voltage of the power supply.
· Check whether the circuit breaker is ON.
· The internal fuse (power) may be blown.
Check connections.
3
Chapter 3 Setting Preparations
The maximum allowed power supply voltage is 275 V.
(2) If the current check results in NG
Reduce the current to 20 A or less.
(3) If the VA check results in NG
The VA (voltage x current) must be 5,000 VA or lower.
HIOKI ST5540A981-09
46
3.5 Pre-Test Inspection
(4) Polarity check results
The wiring may not be configured for uninterrupted polarity switching. Check
the wiring. · The grounding wire may be disconnected. · The power supply may
be a floating power supply. · The power supply may be a single-phase, 3-wire
power
source. The polarities of the power supply are reversed. Reverse the L and N
wire connections on [LINE IN]. See “Connecting the power cord of the equipment
under test” (p. 33)
HIOKI ST5540A981-09
47
Settings
Chapter 4
The setup procedure differs with the measurement method (Manual/Automatic).
Manual measurement :
3
Perform the settings described from “4.1 Selecting a Network” (p. 48) to “4.8 Changing the Measurement
Method (Auto/Manual)” (p. 67).
Automatic measurement :
4
Perform the settings described from “4.1 Selecting a Network” (p. 48) to “Setting the measuring time” (p. 73).
Chapter 4 Settings
HIOKI ST5540A981-09
48
4.1 Selecting a Network
4.1 Selecting a Network
1. After the power switch of the HiTESTER is set to ON ( ), the initial screen appears.
2. Press
and then display the network select screen.
Press the
Initial screen to switch the network selection screen.
Network select screen 1
Network select screen 2
3. After the desired network is selected, the initial screen appears.
To change the network, return to the network select screen by pressing the
key.
· The instrument normally functions as an ammeter, but will operate as a volt
meter when “voltmeter” is selected in the mode setting screen.
When the network configuration not supported by networks A to G is required,
your own network can be connected for testing by using the instrument as a
voltmeter. See “7.1 Setting the Mode (Using the instrument as a voltmeter /
measuring protective
conductor current)” (p. 117)
· Once a network is selected, the initial screen appears the next time power
is turned on. If turning the power switch off with the measurement screen
displayed, the measurement screen is redisplayed the next time power is on.
HIOKI ST5540A981-09
49
4.2 Selecting the Grounding Class of Equipment Under Test
4.2 Selecting the Grounding Class of Equipment Under Test
2 3
13
4
4
Setting screen of equipment under test (when selecting network A, C, D, E, F or G)
Chapter 4 Settings
2
Initial screen
3
4
Setting screen of equipment under test (when selecting network B1 or B2)
1. On the initial screen, press the
key to display the setting screen of the equip-
ment under test. Set the grounding class of the equipment under test.
Inspection of Class-I equipment Inspection of Class-II equipment Inspection of internally powered equipment
Inspection of equipment with Type B applied part (when selecting network B1,
B2)
Inspection of equipment with Type BF applied part (when selecting network B1,
B2)
Inspection of equipment with Type CF applied part (when selecting network B1,
B2)
3. 4.
To manage measurement data, register equipment name and control number. See “Registering an Equipment Name/Control Number” (p. 50)
Press
to return to the initial screen.The keys displayed indicate inspection items required
by the selected class.
HIOKI ST5540A981-09
50
4.2 Selecting the Grounding Class of Equipment Under Test
When the grounding class set for the equipment under test is changed, the condition settings on the measurement screen are initialized except for the allowable value factor. When the instrument is set to internally powered equipment, even if the breaker is turned On, the power supply to the equipment under test will be interrupted (grounding connection will also be interrupted).
Registering an Equipment Name/Control Number
An equipment name and a control number can be registered. The name and number
registered are included in the data that is printed or saved. Once a name and
number are registered, both are included in printed and saved data until the
setting is changed. Up to 12 characters can be entered. Since the entered
information is saved along with measurement data, entering information can be
useful.
1. On the setting screen of the equipment under test,
press
to display the alphabetic character
input screen.
The input screen shows “—–” by default.
1
4
7
2. Enter an equipment name.
Before entering, be sure to press input box.
to clear the
Setting screen of equipment under test
Clears the equipment name or control number.
Backspace.
Switches between the alphabetic character input screen and numeric character input screen.
2
3
3. Press
to register the input and return to the
setting screen of the equipment under test.
4. Press
to display the numeric character input
screen.
5. Enter a control number.
6. Press
to register the input and return to the
setting screen of the equipment under test.
7. Press
to return to the initial screen.
Alphabetic character input screen
6
Numeric character input screen
HIOKI ST5540A981-09
Chapter 4 Settings
51
4.3 Selecting a Measurement Mode (opens the measurement screen)
4.3 Selecting a Measurement Mode (opens the measurement screen)
To use the instrument as a voltmeter or measure protective conductor current,
see “Chapter 7 Instrument System Settings” (p. 115). After a measurement mode
is selected on the initial screen, the measurement screen appears.
· The number of measurement modes displayed on the screen varies depend-
3 ing on the network and class settings selected.
· Some measurement modes may not be available for selection depending on the
class and applied part settings.
· When power on polarity switching is set to On, a power on check is performed
4 before a measurement screen appears. If the result of the power on check is
NG, press “Yes” to return to the leakage current mode selection screen to
check connections again. Example : Selecting measurement mode (Enclosure-
Enclosure leakage current) in the initial screen. (network A)
Return to initial screen.
HIOKI ST5540A981-09
52
4.3 Selecting a Measurement Mode (opens the measurement screen)
Selectable measurement modes
When selecting network A
Grounding class
Measurement mode
Earth leakage current Enclosure – Earth leakage current
Enclosure – Enclosure leakage current
Enclosure – Line leakage current Free current
Class-I equipment
When selecting network C or G
Grounding class
Measurement mode Earth leakage current
Touch current (Enclosure – Earth) Touch current
(Enclosure – Enclosure) Touch current (Enclosure – Line)
Class-I equipment
When selecting network D, E or F
Grounding class
Measurement mode
Earth leakage current Enclosure – Earth leakage current
Enclosure – Enclosure leakage current
Enclosure – Line leakage current
Class-I equipment
Class-ll equipment
Internally powered equipment
: Can be set, : Cannot be set
Class-ll equipment
Internally powered equipment
: Can be set, : Cannot be set
Class-ll equipment
Internally powered equipment
: Can be set, : Cannot be set
HIOKI ST5540A981-09
53
4.3 Selecting a Measurement Mode (opens the measurement screen)
When selecting network B1
Grounding class Class-I equipment
Class-ll equipment
Internally powered equipment
Measurement mode applied part
Earth leakage current
Enclosure – Earth leakage current
Enclosure – Enclosure leakage current
Patient auxiliary current
Patient leakage current I
Patient leakage current II
Patient leakage current III
Free current
Type Type Type Type Type Type Type Type Type
B
BF CF
B
BF CF
B
BF CF
3
4
When selecting network B2 Grounding class
: Can be set, : Cannot be set
Class-I equipment
Class-ll equipment
Internally powered equipment
Chapter 4 Settings
Measurement mode applied part
Earth leakage current
Touch current (Enclosure – Earth)
Touch current (Enclosure – Enclosure)
Patient auxiliary current
Patient leakage current (Patient connection – Earth)
Patient leakage current (external voltage on a SIP/SOP)
Patient leakage current (external voltage on a specific F-type
applied part)
Patient leakage current (external voltage on metal accessible
part not protectively earthed)
Total patient leakage current (Patient connection – Earth)
Total patient leakage current (external voltage on a SIP/SOP)
Total patient leakage current (external voltage on a specific F-type
applied part)
Total patient leakage current (external voltage on metal accessible
part not protectively earthed)
Free current
Type B
Type BF
Type CF
Type B
Type BF
Type CF
Type B
Type BF
Type CF
: Can be set, : Cannot be set
HIOKI ST5540A981-09
54
4.4 Setting the Measurement Range (Auto/Hold)
4.4 Setting the Measurement Range (Auto/Hold)
Select auto range for automatic range selection. Selecting hold range allows
the user to specify one of four ranges. When using the Hold range, if you
cannot have the faintest idea about the current type and size, please measure
it by “AC+DC” to have a rough idea and decide the measurement range.
Note that the instrument may be damaged if the applied current exceeds the
measurement range.
· Any input that exceeds the indication range is indicated as “OVER FLOW”. ·
The maximum indication value differs for network D,F and G.
(The range name indicated is the name of the representative network whose
basic element is 1 k.) · The minimum indication value in the Hold range
setting varies depending on the network selected. · The range configuration
differs only when the target current is set to “ACPeak.” · Caution on using
the Hold range When “!” is displayed and then a lower sensitivity range is
chosen, the judgement result may be out of the guaranteed accuracy range. See
“About Peak Over “!”” (p. 58) · As for ACPeak measurement, please set the
allowable value to a bigger one than the minimum indication value in the
range. Setting a value less than the minimum indication value disables any
numeric comparison,displayed “Comp Low, Range Down” and setting a value bigger
than the maximum indication value,displayed “Range Up.” See Range of
indication:
“Ammeter mode/unit of indication : AUTO range of indication” (p. 55) See
“Ammeter mode/unit of indication : mA (HOLD) range of indication” (p. 57) ·
The auto range is not available when a 0.1 Hz frequency range setting is
made. Selecting auto range automatically sets the hold range (during AC peak
measurements: 1.000 mA range; during AC/DC/AC+DC measurements: 500.0 A range).
HIOKI ST5540A981-09
55
4.4 Setting the Measurement Range (Auto/Hold)
1. On the measurement screen, press
to display the measurement range setting screen.
Select a measurement range.
Sets the current range to the Auto (automatic) range.
3
Sets the current range to the Hold (fixed) range.
4 2. Selecting the Hold range displays a set of range setting keys.
Use these keys to select a range.
When setting the target current to AC, DC, or AC+DC
When setting the target current to AC Peak
Chapter 4 Settings
Sets the fixed 50 mA range.
Sets the fixed 75 mA range.
Sets the fixed 5 mA range.
Sets the fixed 10 mA range.
Sets the fixed 500 A range.
Sets the fixed 1 mA range.
Sets the fixed 50 A range.
Sets the fixed 500 A range.
The “fixed 500 A range” is selected in this screen.
The “fixed 1 mA range” is selected in this screen.
3. Press
to return to the measurement screen.
Ammeter mode/unit of indication : AUTO range of indication
HIOKI ST5540A981-09
56
4.4 Setting the Measurement Range (Auto/Hold)
Range of indication depends on selected unit of indication.
See “7.1 Setting the Mode (Using the instrument as a voltmeter / measuring
protective conductor current)” (p. 117) See For details of accuracy guaranteed
range: “10.4 Accuracy” (p. 260) See “7.10 Setting Indication Unit” (p. 134)
When selecting network A, B1, B2, C, E, or G (Measurement of AC, DC, or AC+DC)
Range
50.00 mA
5.000 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
50.00 mA |
0.00 mA (0.00 mA)
5.000 mA |
0.000 mA (0.000 mA)
500.0 A
500.0 A |
0.0 A (0.0 A)
50.00 A
50.00 A |
1.01 A (0.00 A)
(Measurement of ACPeak)
Range
75.0 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
75.0 mA |
0.0 mA (0.0 mA or less)
10.00 mA
10.00 mA |
0.00 mA (0.00 mA or less)
1.000 mA
1.000 mA |
0.000 mA (0.000 mA or less)
When selecting network D
(Measurement of AC, DC, or AC+DC)
Range
50.00 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
33.00 mA |
0.00 mA (0.00 mA)
5.000 mA
3.300 mA |
0.000 mA (0.000 mA)
500.0 A
330.0 A |
0.0 A (0.0 A)
500.0 A 500.0 A
| 1.1 A (0.0 A)
50.00 A 33.00 A
| 1.01 A (0.00 A)
(Measurement of ACPeak)
Range
75.0 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
50.00 mA |
0.0 mA (0.0 mA or less)
10.00 mA
6.60 mA |
0.00 mA (0.00 mA or less)
1.000 mA
0.660 mA |
0.000 mA (0.000 mA or less)
When selecting network F
(Measurement of AC, DC, or AC+DC)
Range
50.00 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
25.00 mA |
0.00 mA (0.00 mA)
5.000 mA
2.500 mA |
0.000 mA (0.000 mA)
500.0 A
250.0 A |
0.0 A (0.0 A)
500.0 A 330.0 A
| 1.1 A (0.0 A)
50.00 A 25.00 A
| 1.01 A (0.0 A)
(Measurement of ACPeak)
Range
75.0 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
37.5 mA |
0.0 mA (0.0 mA or less)
10.00 mA
5.00 mA |
0.00 mA (0.00 mA or less)
1.000 mA
0.500 mA |
0.000 mA (0.000 mA or less)
500.0 A
250.0 A |
1.1 A (0.0 A)
HIOKI ST5540A981-09
57
4.4 Setting the Measurement Range (Auto/Hold)
Ammeter mode/unit of indication : mA (HOLD) range of indication
Sets the unit of current measurement to mA. See “7.1 Setting the Mode (Using
the instrument as a voltmeter / measuring protective conductor current)” (p.
117) See For details of accuracy guaranteed range:”10.4 Accuracy” (p. 260) See
“7.10 Setting Indication Unit” (p. 134)
When selecting network A, B1, B2, C, E, or G
(Measurement of AC, DC, or AC+DC)
Range
50.00 mA
5.000 mA
500.0 A
50.00 A
Maximum indication value to
Minimum indication value (In Hold range setting)
50.00 mA |
0.00 mA (0.00 mA)
5.000 mA |
0.000 mA (0.000 mA)
0.500 mA |
0.000 mA (0.000 mA)
0.050 mA |
3
0.002 mA
(0.000 mA)
(Measurement of ACPeak)
4
Range
75.0 mA
10.00 mA
1.000 mA
500.0 A
Maximum indication value to
Minimum indication value (In Hold range setting)
75.0 mA |
0.0 mA ( 0.0 mA or less)
10.00 mA |
0.00 mA (0.00 mA or less)
1.000 mA |
0.000 mA (0.000 mA or less)
0.500 mA |
0.002 mA (0.000 mA)
Chapter 4 Settings
When selecting network D
(Measurement of AC, DC, or AC+DC)
Range
50.00 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
33.00 mA |
0.00 mA (0.00 mA)
5.000 mA
3.300 mA |
0.000 mA (0.000 mA)
500.0 A
0.330 mA |
0.000 mA (0.000 mA)
50.00 A
0.033 mA |
0.002 mA (0.002 mA)
(Measurement of ACPeak)
Range
75.0 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
50.0 mA |
0.0 mA (0.0 mA or less)
10.00 mA
6.60 mA |
0.00 mA (0.00 mA or less)
1.000 mA
0.660 mA |
0.000 mA (0.000 mA or less)
When selecting network F
(Measurement of AC, DC, or AC+DC)
Range
50.00 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
25.00 mA |
0.00 mA (0.00 mA)
5.000 mA
2.500 mA |
0.000 mA (0.000 mA)
500.0 A
0.250 mA |
0.000 mA (0.000 mA)
500.0 A 0.330 mA
| 0.002 mA (0.000 mA)
50.00 A 0.025 mA
| 0.002 mA (0.000 mA)
(Measurement of ACPeak)
Range
75.0 mA
Maximum indication value to
Minimum indication value (In Hold range setting)
37.5 mA |
0.0 mA (0.0 mA or less)
10.00 mA
5.00 mA |
0.00 mA (0.00 mA or less)
1.000 mA
0.500 mA |
0.000 mA (0.000 mA or less)
500.0 A
0.250 mA |
0.002 mA (0.000 mA)
HIOKI ST5540A981-09
58
4.4 Setting the Measurement Range (Auto/Hold)
About Peak Over “!”
· When measuring in Hold
(fixed) range setting, if a por-
tion of measuring current goes
!
over the input allowable range
for the circuit, “!” together with
“FAIL” may be displayed on the measuring screen. “!”
means that some of the instan-
taneous values go over the
input allowable range. In this
case, please select a lower
sensitivity range to measure.
· When measuring in Auto
(automatic) range, if some of the instantaneous values goes over the input
allowable range and then a lower sensitivity range is chosen, the judgement
result may be out of the guaranteed accuracy range.
· “!” will be displayed only in ammeter mode and not in voltmeter mode. “!” infor-
mation is not available for RS-232C or GP-IB communication or printers. In case
of displaying “!”, “OVER FLOW” and “Range Up” will also be displayed.
· An error screen like the one
shown in the figure appears
when an excessive current input
is made to the instrument.
Check the equipment under test
and the wiring and press the
“Ret” key.
You must press the
to
start operation.
HIOKI ST5540A981-09
59
4.5 Setting the Filter
4.5 Setting the Filter
(when selecting network A, B1, B2 or C)
Turn the filter for the measurement network ON and OFF or change the setting
of the filter. In manual measurement, the measurement value can be checked
while switching the filter ON and OFF.
3 When selecting network A , B1 or B2 :The filter is switched ON and OFF.
When selecting network C
:The filter is set to ON1-U2/ON1 –
U1/ON2-U3/ON2-U1 or OFF.
When selecting network D, E, F or G : No setting for filter.
4
When selecting network A
1. On the measurement screen, press
to
display the network filter setting screen.
2. Change the setting of the filter for the network.
Chapter 4 Settings
Sets the multi-frequency network.
Sets the single-frequency network.
3. Press
to return to the measurement screen.
When selecting network B1, B2
1. On the measurement screen, press
to dis-
play the network filter setting screen.
2. Change the setting of the filter for the network.
3. Press
Sets the network with a frequency characteristic. Sets the network with only 1
k non-inductive resistance.
to return to the measurement screen.
HIOKI ST5540A981-09
60
4.5 Setting the Filter
When selecting network C
1. On the measurement screen, press
to
display the network filter setting screen. Change the setting of the filter for the network.
Sets a network compatible with perception/reaction. Sets a network compatible with abandonment. Sets the body impedance network.
See “Network C (for IEC 60990)” (p. 274)
Press
to return to the measurement screen.
HIOKI ST5540A981-09
61
4.6 Setting the Allowable Value
4.6 Setting the Allowable Value
Set the allowable value (upper-limit leakage current value) for the measurement value and maximum
value.
According to the status (normal condition, single-fault condition) of the equipment under test, two values
can be set.
The allowable value setting is based on “Numeric value x Factor.”
Use the allowable value setting to provide a margin or compensate for measurement error.
The factor is set to “100%” by default. (Input range 1 to 100% )
3
Set a lower limit value when required.
· Setting a lower limit value for all measurement modes.
See “7.9 Setting Lower Limit Values (factor)” (p. 133) · Setting a lower limit value for specific measurement modes.
4
See “Turning lower limit values on and off for specific leakage current measurements” (p. 63)
Chapter 4 Settings
The instrument indicates the result (PASS/FAIL/LOW indication) of comparison
between the measurement value and allowable value. In automatic measurement,
the judgement result is output from EXT I/O. See “9.2 Connecting to the EXT
I/O Terminal” (p. 249)
The buzzer that sounds based on the judgement result can be disabled. See
“7.13 Setting the Beep Sound” (p. 138)
HIOKI ST5540A981-09
62
4.6 Setting the Allowable Value
2 3
45
Allowable value setting screen (Normal condition, numeric value setting mode)
6 7
Allowable value setting screen (Normal condition, factor setting mode)
1. On the measurement screen, press
to
display the allowable value setting screen.
2. Press
to activate the allowable value
setting condition for normal condition.
3. Enter a numeric value by using numeric keys
(
through
, and
).
To correct an input error, press the Clear
( ) key, then reenter the input.
4. Enter the unit of allowable value.
Pressing a Unit key ( ,
) immedi-
ately confirms the numeric input.
5. Press
to set factor setup status for set
allowable value. Enter a numeric value by using numeric keys
(
through
).
To correct an input error, press the Clear ( ) key, then reenter the input.
Pressing the Unit key (
) immediately
confirms the factor input.
8 10
8. 9.
10.
Press
to activate the allowable value
setting condition for fault condition.
In the same way as for setting the normal condition, make the necessary settings by following steps 3 through 7.
Press screen.
to return to the measurement
Allowable value setting screen (fault condition, numeric value setting mode)
HIOKI ST5540A981-09
63
4.6 Setting the Allowable Value
· The allowable value setting range is from 5 A to 50 mA. If a value less than 5 A is entered, the setting is automatically adjusted to “5 A.” If a value greater than 50 mA is entered, the setting is automatically adjusted to “50 mA.”
· If the screen is changed without pressing
,
allowable value setting does not take effect.
or
, the new
· The Unit keys ( , pressed.
,
3 ) cannot be operated until a numeric key is
About allowable value judgement
When the indication unit is fixed to “mA,” FAIL judgement may result even if
4 the measurement value (or maximum value) and allowable value are the
same. This is because internally retained data contains lower-order digits
even if the unit is fixed to “mA,” and judgement is made using the values with
lower-order digits.
An allowable value setting lower than the accuracy guarantee range, dis-
played “Comp Low”.
Chapter 4 Settings
Turning lower limit values on and off for specific leakage current measurements
Use the functions below to turn the lower limit value on or off for specific measurements.
Press
to turn the lower limit value on.
Press
to turn the lower limit value off.
This screen allows you only to turn lower limit values On or Off. Use the System settings (p. 133) to change coefficients for lower limit values or turn on or off all lower limit values.
HIOKI ST5540A981-09
64
4.7 Selecting the Type of Target Current
4.7 Selecting the Type of Target Current
1. On the measurement screen, press
to display the target current setting screen.
Select the type of target current. For AC measurement For DC measurement For AC + DC measurement For AC peak measurement
Auxiliary current setting screen
2. Press
to return to the measurement screen.
Measurement screen
Measurement screen (When selecting network B1 or B2)
In the diagram, the target current is set to “AC” (alternating current).
When network B1 or B2 is selected, some measurement modes do not permit measurement current settings and can therefore not indicate current and current setting conditions. Only measurement modes involving multiple auxiliary currents are displayed to enable selection of auxiliary current. See “Selectable target currents” (p. 65)
appears on the measurement screen only when selection of auxiliary current is enabled.
HIOKI ST5540A981-09
65
4.7 Selecting the Type of Target Current
Selectable target currents
Network Measurement mode
Earth leakage current
Enclosure – Line leakage current Enclosure – Earth leakage current Enclosure –
Enclosure leakage current
Free current
A
AC DC AC+DC
AC DC AC+DC
AC DC AC+DC
AC DC AC+DC
AC DC AC+DC ACPeak
Measurement mode
Network
Earth leakage current
Touch current (Enclosure – Line)
Touch current (Enclosure – Earth)
Touch current (Enclosure – Enclosure)
Patient auxiliary current
Patient leakage current (Patient connection – Earth) B1:Patient leakage
current I
Patient leakage current (external voltage on a SIP/SOP) B1:Patient leakage
current II
Patient leakage current (external voltage on a specific
F-type applied part) * B1:Patient leakage current III
B1
AC+DC
AC+DC AC+DC AC DC AC DC AC+DC
AC+DC
D
AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak
E
AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak
F
AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak
3 4
Chapter 4 Settings
: Cannot be set: Not applicable
B2
AC+DC
AC+DC AC+DC AC DC AC DC AC DC
AC+DC
C AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak
G AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak AC DC AC+DC ACPeak
: Cannot be set: Not applicable
HIOKI ST5540A981-09
66
4.7 Selecting the Type of Target Current
Measurement mode
Network
Patient leakage current (external voltage on metal accessible part
not protectively earthed)
Total patient leakage current (Patient connection – Earth)
Total patient leakage current (external voltage on a SIP/SOP)
Total patient leakage current (external voltage on
a specific F-type applied part)
Total patient leakage current (external voltage on metal accessible part
not protectively earthed)
Free current
B1 AC DC AC+DC ACPeak
B2
AC+DC
AC DC
AC DC AC+DC AC+DC × AC DC AC+DC ACPeak
C
G
: Cannot be set: Not applicable
HIOKI ST5540A981-09
67
4.8 Changing the Measurement Method (Auto/Manual)
4.8 Changing the Measurement Method (Auto/Manual)
(1) Manual measurement
The measurement value can be checked while changing the target current, filter
setting, power supply polarity, and equipment status.
(2) Automatic measurement
3 The power supply polarity and equipment status are automatically switched
during measure-
ment. The item to be switched automatically can be selected and the measuring
time set.
1. On the measurement screen, press
to display the manual/auto measurement setting
4
screen.
Chapter 4 Settings
1 2. Select a measurement mode.
For manual measurement
For automatic measurement
Setting screen (Manual measurement)
Return to measurement screen.
Setting screen
Return to
(Automatic measurement) measurement
screen.
Measurements start when measurement is set to “Manual” in the measurement screen. Measurement conditions can be changed during ongoing measurements. Continue to “Chapter 5 Measurement Preparations” (p. 75). Make the following settings to make automatic measurements.
HIOKI ST5540A981-09
68
4.8 Changing the Measurement Method (Auto/Manual)
Setting automatic measurement items
The selected network, class and measurement mode determine what measurement items will appear.
See Appendix2 “List of instrument status, other test condition and special test condition”(p.A4)
1. On the automatic measurement setting screen, press
to display the automatic measure-
ment item setting screen.
2. Turn automatic measurement for each measurement item ON or OFF.
Each time a key is pressed, the indication switches between ON and OFF.
ON : Sets automatic
1
measurement item. OFF : Does not set
automatic measurement item.
2 Return to setting screen.
1. Power supply polarity
Indicates “positive phase.”
Indicates “negative phase.”
Equipment with an internal power supply cannot be set. See “Line phase in
leakage current measurement
between enclosure and line” (p. 69)
2.Condition of equipment under test (power supply)
Sets “Normal condition.”
Sets a “Single fault condition” (power supply lead is disconnected). Sets a
“Single fault condition”(protective earth terminal is disconnected).
Other conditions
Applies a voltage to the L line.
Applies a voltage to the N line.
*1
Sets application positive phase.
of
110%
of
voltage,
(When selecting network B1.)
*1
Sets application negative phase.
of
110%
of
voltage,
(When selecting network B1.)
Automatic measurement item setting screen Other test condition (Other applied
voltages)2
1 Sets application of 110% of voltage, positive phase.
1 Sets application of 110% of voltage, negative phase.
Sets application of 110% of voltage, OFF.
See “Measurement with 110% voltage application (Other test condition)” (p. 69)
Special test condition (Specific applied voltage)2
1 Sets application of 110% of voltage, positive phase.
1 Sets application of 110% of voltage, negative phase.
See “Measurement with 110% voltage application (Special test condition)” (p.
69)
Target current
Measurement current can be selected when automatic measurement item is
selected only when network B1 or B2 is selected and patient leakage current I
mode, patient leakage current (Patient connection – Earth) or patient
auxiliary current is also selected. (In any other mode, AC + DC is
automatically selected and cannot be changed)
Sets AC measurement.
Sets DC measurement.
1 The “N” key indicates positive phase and “R” negative phase.
2 When selecting network B2.
HIOKI ST5540A981-09
69
4.8 Changing the Measurement Method (Auto/Manual)
Line phase in leakage current measurement between enclosure and line Shown when network A, C, D, E, F or G is selected.
- Conducts measurement with voltage of the L (live) side of power supplied to [LINE IN].
Conducts measurement with voltage of the N (neutral) side of power supplied to [LINE IN].
3
EX.:Automatic measurement item setting
measurement between enclosure and line
Measurement with 110% voltage application
4
(Other test condition)
Shown when network B2 is selected
- Conducts measurement with voltage that is in the same phase as power supplied to [LINE IN].
Chapter 4 Settings
Conducts measurement with voltage that is in the reversed phase of power supplied to [LINE
IN].
EX.:Automatic measurement item setting screen for network B2 and patient leakage current (SIP/SOP) measurement
- Conducts measurement turning off power supply connected to [LINE IN].
These two settings cannot be set to OFF at the same time.
Measurement with 110% voltage application (Special test condition)
Shown when network B2 is selected
-
Conducts measurement with voltage that is in the same phase as power supplied to [LINE IN].
Conducts measurement with the reversed phase of power
voltage that is in supplied to [LINE
IN].
These two settings cannot be set to OFF at the same time.
EX.:Automatic measurement item setting screen for network B2 and patient leakage
*The “N” key indicates positive phase and “R” negative phase.
current (Metal accessible part) measurement
All measurement items cannot be turned off. At least one item must be on. (An attempt to turn off all items, will cause one item to go on.)
At least 1 item will be on. It is not possible to turn off all items.
HIOKI ST5540A981-09
70
4.8 Changing the Measurement Method (Auto/Manual)
Setting the measurement delay (delay time)
On the automatic measurement screen, press
to display the measurement delay time setting screen.
Automatic measurement item setting screen
Measurement delay time setting screen
Delay times
Increments the numeric value. Decrements the numeric value.
Return to Automatic measurement item setting screen
The figure below shows the relationship between delay times (a), (b1), (b2) and (c) and measurement time.
Start of automatic measurement
Start of
End of
measurements measurements
First test item
Next test item
Auto range operation 15 sec (at a setting of 0.1 Hz)
Delay (b1)+(b2) or Delay (c)
Measurement time
Delay (a)
Next test item Delay (b1)+(b2) or Delay (c)
In the following cases, delay b2 and delay c may last longer than the set
delay time.
· When auto range is set and auto range does not stabilize during the set
delay time, the delay time is extended as required.
· The time-out for auto range is 5 seconds. If the range does not stabilize
within 5 seconds, operation is terminated.
· When the frequency range is set to start from 0.1 Hz, 15 sec is added before
measurements start so a measurement setting of less than 15 sec will still
include a 15 sec delay. (Includes a 15 sec delay time)
However, if the delay time is set to 15 sec or longer, that setting will have
priority.
HIOKI ST5540A981-09
71
4.8 Changing the Measurement Method (Auto/Manual)
(a): Setting the time for disconnecting one wire
Use this function to set the time of disconnection of one wire
after the previous measurement ends and before continuing
with the next one when the next measurement is “disconnec-
tion of one wire in power cord.”
(This time setting gives a connected computer enough time to
shut down before “disconnection of one wire in power cord”
occurs as a sudden shutdown could damage it.)
3
Press
and set Delay (a).
(0 sec. to 30 min. (in 1 sec. increments))
4
(b1), (b2): Setting polarity switching time
When power on polarity switching is used, the power is not turned off even during polarity switching and a delay (b1 and b2) need not be set.
Chapter 4 Settings
Start of polarity switching
Polarity is switched
Start of measurements
Power off period Power returns
Delay b1
Delay b1
Delay b2
The power is momentarily turned off when polarity is switched. Set this delay to prevent damaging equipment by power being turned off and then immediately being turned back on.
Press
and set Delay (b2).
(0 sec. to 30 min. (in 1 sec. increments))
Delay b2
The power is momentarily turned off when polarity is switched. Set this delay in turning the power on again after equipment under test has been turned off.
Press
and set Delay (b2).
(1 sec. to 30 min. (in 1 sec. increments))
HIOKI ST5540A981-09
72
4.8 Changing the Measurement Method (Auto/Manual)
(c): Setting the time to start measurements not involving polarity switching
Use this function to set the time for the start of the next measurement under
conditions other than (a) and (b). Set a delay for measurements that does not
involve polarity switching.
Press
and set Delay (c).
(1 sec. to 30 min. (in 1 sec. increments))
HIOKI ST5540A981-09
73
4.8 Changing the Measurement Method (Auto/Manual)
Setting the measuring time
1. On the automatic measurement screen, press
to display the measurement time setting
screen.
2. Set the measuring time. (1 sec. to 5 min. (in 1 sec. increments))
3
4
Chapter 4 Settings
Automatic measurement item setting screen
Measuring time setting screen
Increments the numeric value. Decrements the numeric value.
If measurement values do not stabilize due to abrupt input fluctuations in the auto range during automatic measurements, measurements are terminated and no further measurements are made.
Status indication of instrument during automatic measurements
During automatic measurements, the item above the Stop key indicates
instrument status.
Displayed items Time until transition to disconnection of one wire in power
cord
Time until power supply polarity is switched
Time until transition to measurements other than polarity switching During
measurements
HIOKI ST5540A981-09
74
4.8 Changing the Measurement Method (Auto/Manual)
HIOKI ST5540A981-09
L
Measurement Preparations
75
5.1 Connecting the Test Lead
Chapter 5
5.1 Connecting the Test Lead
When a measurement mode is selected, the measuring terminals (T1, T2, and T3)
to be used for measurement are indicated at the top of the screen. Connect the
test leads based on the indications displayed.
5
Chapter 5 Measurement Preparations
To avoid breaking the test leads, do not bend or pull them.
The list of the measuring terminals to be used
When selecting network A, D, E or F
Earth leakage current Enclosure – Earth leakage current Enclosure – Enclosure
leakage current
Enclosure – Line leakage current (Selected line Internal)
Enclosure – Line leakage current (Selected line External) Free current *
Class-I equipment
T2 T1, T2 T2
T1, T2
T1, T2
Class-II equipment
T2 T1, T2
T2
Internally powered equipment T2 T1, T2
T1, T2
T1, T2
T1, T2
*Only network A provides free current
When selecting network C, G
Earth leakage current Touch current (Enclosure – Earth) Touch current
(Enclosure – Enclosure) Touch current (Enclosure – Line)
(Selected line Internal) Touch current (Enclosure – Line)
(Selected line External)
Class-I equipment
T2 T1, T2 T2
T1, T2
Class-II equipment
T2 T1, T2 T2
T1, T2
Internally powered equipment T2 T1, T2
HIOKI ST5540A981-09
76
5.1 Connecting the Test Lead
When selecting network B1
Class-I equipment
Class-II equipment
Internally powered equipment
Type B Type BF Type CF Type B Type BF Type CF Type B Type BF Type CF
Earth leakage current
Enclosure – Earth leakage current
Normal Fault/ Apply
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
Enclosure – Enclosure leakage current
Normal T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2
Fault/ Apply
T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3
Patient auxiliary current
T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2
Patient leakage current I
T2
T2
T2
T2
T2
T2 T1,T2 T1,T2 T1,T2
Patient leakage current II
T2,T3
T2,T3
T2,T3
Patient leakage current III
T2
T2
T2
T2
T2
T2
Free current
Normal T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2
Fault/ Apply
T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3
When selecting network B2
Class-I equipment
Class-II equipment
Internally powered equipment
Type B Type BF Type CF Type B Type BF Type CF Type B Type BF Type CF
Earth leakage current
Touch current (Enclosure – Earth)
Normal T2
Fault/ Apply
T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
T2 T2,T3
Touch current (Enclosure – Enclosure)
Normal T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2
Fault/ Apply
T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3
Patient auxiliary current
T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2
Patient leakage current (Patient connection – Earth)
T2
T2
T2
T2
T2
T2
T1,T2 T1,T2 T1,T2 or T2 or T2 or T2
Patient leakage current (external voltage on a SIP/SOP)
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
Patient leakage current
(external voltage on a specific
T2
T2
T2
T2
T2
T2
F-type applied part)
Patient leakage current
(external voltage on metal accessi- T2,T3 T2,T3
T2,T3 T2,T3
T2,T3 T2,T3
ble part not protectively earthed)
Total patient leakage current (Patient connection – Earth)
T2
T2
T2
T2
T2
T2 T1,T2 T1,T2 T1,T2
Total patient leakage current (external voltage on a SIP/SOP)
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
T2,T3
Total patient leakage current
(external voltage on a specific
T2
T2
T2
T2
T2
T2
F-type applied part)
Total patient leakage current
(external voltage on metal accessi- T2,T3 T2,T3
T2,T3 T2,T3
T2,T3 T2,T3
ble part not protectively earthed)
Free current
Normal T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2 T1,T2
Fault/ Apply
T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3 T1,T2,T3
HIOKI ST5540A981-09
Using L2200 Test Lead
77
5.1 Connecting the Test Lead
To avoid the risk of electric shock, do not touch the tips of test leads
connected to terminals T1, T2, and T3.
In some measurement modes, high voltage is output from the terminals.
Do not touch any part of the test lead beyond the finger barrier
Connect the L2200 Test Lead to a measuring terminal (T1, T2, or T3). The
terminal to be used varies depending on the measurement mode. See”5.1
Connecting the Test Lead” (p. 75)
5 To apply 110% of rated voltage, use an isolation transformer to supply the
volt-
age to [LINE IN]. The voltage applied to [LINE IN] is also output from the T3
terminal.
Chapter 5 Measurement Preparations
Using the 9195 Enclosure Probe (for measuring enclosure leakage current)
When measuring enclosure leakage current, position the surface contact probe
on the enclosure of the equipment under test, then set the test lead on the
surface contact probe. Ensure full contact of the surface contact probe on the
enclosure by applying about 0.5 N/cm2 of pressure.
HIOKI ST5540A981-09
78
5.1 Connecting the Test Lead
Using Alligator Clips (when using two or three test leads)
Position the test lead on the enclosure or terminal of the equipment under
test to measure leakage current. When using two or three lead wires, alligator
clips may be used to ensure a secure connection. Detach the pin lead from the
tip of each L2200 Test Lead and insert the included alligator clip.
] Pin leads and alligator clips can be connected to either end of the
connection cord.
HIOKI ST5540A981-09
Measurements
79
6.1 Making manual measurements
Chapter 6
6.1 Making manual measurements
Free-run measurements start when measurement is set to “Manual” in the
measurement screen. Measurement conditions can be changed during ongoing
measurements. (Manual measurements cannot be made when an internal class is
selected.)
Pre-test inspection
Perform a pre-test inspection. See “3.5 Pre-Test Inspection” (p. 41)
Setup
Set up the instrument.
See “Chapter 4 Settings” (p. 47)
During measurements (switching manual measurement item)
6
On the measurement screen, press
and then
to display the manual measurement setting screen. This allows the user to change power supply polarity and equipment condition.
The measurement items that appear depend on the selected network, class and
measurement mode. See “Changing manual measurement items” (p. 80)
During measurements (switching auxiliary current)
Chapter 6 Measurements
On the measurement screen, press
to display the target
current setting screen.
This setting allows the user to change the target current.
See “Changing manual measurement items” (p. 80)
The CAL key appears when 0.1 Hz frequency range is set. See (p. 43)
When measurements end
When measurements end, print or save the measurements as required. On the measurement screen,
press
to print the measurement data.
See “6.6 Printing Measurement Data (as required)” (p. 108)
On the measurement screen,
press
to store the measurement data in internal memory.
See “6.4 Saving Measurement Data (As required)” (p. 102)
To repeat automatic measurements, press
.
HIOKI ST5540A981-09
80
6.1 Making manual measurements
Changing manual measurement items
The indication varies depending on the network, class setting, and measurement
mode selected. See Appendix2 “List of instrument status, other test condition
and special test condition” (p. A4)
1. Power supply polarity
Indicates “positive phase.”
Indicates “negative phase.”
Equipment with an internal power supply cannot be set.
2. State of equipment under test (power supply)
No equipment whose grounding class is internal can be set.
Sets “Normal condition.”
Sets a “Single fault condition” (power supply lead is disconnected). Sets a
“Single fault condition”(protective earth terminal is disconnected).
1
2
3
3. Other test condition (Other applied voltages)
(When selecting network B2.)
- Sets application of 110% of voltage, positive phase.
Other conditions Sets application of 110% of voltage, positive phase.
1Sets application of 110% of voltage, negative phase.
-
Sets application of 110% of voltage, negative phase.
Sets application of 110% of voltage, OFF.
Special test condition (Specific applied voltage) -
Sets application of 110% of voltage, positive phase. (When selecting network B1.)
-
Sets application of 110% of voltage, negative phase. (When selecting network B1.)
-
Sets application of 110% of voltage, positive phase.
-
Sets application of 110% of voltage, negative phase.
*The “N” key indicates positive phase and “R” negative phase.
SW status (only network B2 on ST5540)
Pressing
in the manual measurement setting
screen opens the switch setting screen.
SW for connecting functional earth terminal and S10 power supply system for
measurement. Set to
On to connect to the LINE IN E terminal.
SW for connecting patient connection to ground S12 of power supply circuit for
measurement. Set to
On to connect to the LINE IN E terminal.
Terminal providing ground connection for metal S13 accessible part not
protectively earthed. Set to
On to connect to the LINE IN E terminal.
For information on connection procedures, refer to (p. 35). Only manual measurements can be set.
HIOKI ST5540A981-09
81
6.1 Making manual measurements
Changing measurement current
The indication varies depending on the network, class setting, and measurement
mode selected.
See Appendix2 “List of instrument status, other test condition and special
test condition” (p. A4)
On the measurement screen, press the auxiliary current setting screen. The following changes can be made.
to display
Target current
Conducts AC measurement.
Conducts DC measurement.
Conducts AC+DC measurement. (When selection is enabled)
Conducts ACPeak measurement. (When selection is enabled)
6
Chapter 6 Measurements
HIOKI ST5540A981-09
82
6.2 Making automatic measurements
6.2 Making automatic measurements
Power supply polarity and equipment status are automatically switched during
measurements. The user can select the measurement items that should be
switched and set the measurement time.
Pre-test inspection
Perform a pre-test inspection. See “3.5 Pre-Test Inspection” (p. 41)
Setup
Set up the instrument. See “Chapter 4 Settings” (p. 47)
Starting measurements
becomes available in the measurement screen that appears after settings are
completed. Press to automatically start measurements.
During measurements
Only
is available during automatic measurements.
An intermittent beep sound during status measurements. No
beep sound is output at this time when the beep setting for
“key input” is turned off.
See “7.13 Setting the Beep Sound” (p. 138)
When measurements end
When measurements end, print or save the measurements as required.
On the Automatic measurement result screen, press measurement data. See “6.6 Printing Measurement Data (as required)” (p. 108)
to print the
On the Automatic measurement result screen, press the measurement data in internal memory. See “6.4 Saving Measurement Data (As required)” (p. 102)
To repeat measurements, press
.
to store
If measurement values do not stabilize due to abrupt input fluctuations in the auto range during automatic measurements, measurements are terminated and no further measurements are made.
HIOKI ST5540A981-09
83
6.3 Measurement examples
6.3 Measurement examples
Earth leakage current measurement
1. 2.
Connect the instrument and the equipment under test. See “3.3 Connecting
equipment under test to the instrument” (p. 36)
During manual measurements, Earth leakage current measurement starts upon
returning to the measurement screen. Measurement conditions can be changed
during measurement. See “6.1 Making manual measurements” (p. 79)
During automatic measurements,
becomes available upon return to the measurement
screen. Press
to start Earth leakage current measurement.
See “Chapter 4 Settings” (p. 47)
Only
is available during automatic measurements.
6
2 1
Chapter 6 Measurements
HIOKI ST5540A981-09
84
6.3 Measurement examples
Touch current measurement Enclosure – Earth measurement
· Conduct leakage current measurement between enclosure and enclosure using
two ungrounded locations on the enclosure.
· The terminal block is not used for internally powered equipment, although
power must be supplied to [LINE IN] by a grounded two-plug power cord.
· When the protective earth conductor is disconnected (single fault), a
protectively earthed enclosure is handled as a non-protectively earthed
enclosure.
1. 2. 3. 4.
Connect the instrument and the equipment under test. See “3.3 Connecting
equipment under test to the instrument” (p. 36)
Connect a test lead to terminal T2. See “5.1 Connecting the Test Lead” (p. 75)
Position the tip of the test lead on the enclosure of the equipment under
test.
During manual measurements, touch current (enclosure – earth) measurement
starts upon returning to the measurement screen. Measurement conditions can be
changed during measurement. See “6.1 Making manual measurements” (p. 79)
During automatic measurements,
becomes available upon return to the measurement
screen. Press
to start leakage current measurement between enclosure and earth.
Only
is available during automatic measurements.
2
4
Terminal T2 and enclosure
1
3
HIOKI ST5540A981-09
85
6.3 Measurement examples
When network B1 or B2 (Other test condition, Special test condition) is
selected and measurement conducted with 110% voltage application
(,
)
· Note that when
is pressed in automatic measurement mode, the instru-
ment generates high voltage without
displayed on the screen.
· To avoid the risk of electric shock when a test lead is connected to the T3 terminal, do not touch the part of the test lead that is beyond the finger barrier. The T3 terminal outputs high voltages.
Do not touch any part of the test lead beyond the finger barrier
The terminal block is not used for internally powered equipment, although power
must be supplied to [LINE IN] by a grounded two-plug power cord. Also, high
voltage occurring at Terminal T3 depends on this power source.
When the instrument is set to internally powered equipment, do not connect the
equipment under test to an outlet or the terminal block since power is supplied
from an outlet during a 110% voltage application test.
1. 2.
Connect the instrument and the equipment under test. See “3.3 Connecting
equipment under test to the instrument” (p. 36)
Connect test leads to terminals T2 and T3.
6
See “5.1 Connecting the Test Lead” (p. 75) Position the tip of the test lead connected to terminal T2 on an ungrounded enclosure section of
the equipment under test. Position the tip of the test lead connected to terminal T3 on an ungrounded signal input section
or signal output section of the equipment under test.
5. During manual measurement,
is available upon return to the measurement screen. Press
Chapter 6 Measurements
to start touch current (enclosure – earth) measurement during a single-fault condition.
Pressing
applies a high voltage to the test lead connected to the T3 terminal.
Press
to terminate output of high voltage.
During automatic measurements,
becomes available upon return to the measurement
screen. Press fault condition.
to start touch current (enclosure – earth) measurement under the single-
Only
is available during automatic measurements.
25 1
HIOKI ST5540A981-09
Terminal T3 and I/O terminal
Terminal T2 and enclosure
34
86
6.3 Measurement examples
Enclosure – Enclosure measurement
· Conduct leakage current measurement between enclosure and enclosure using
two ungrounded locations on the enclosure.
· The terminal block is not used for internally powered equipment.
· When the protective grounding wire is disconnected (single fault), a
protectively earthed enclosure is handled as a non-protectively earthed
enclosure.
1. 2. 3. 4.
Connect the instrument and the equipment under test. See “3.3 Connecting
equipment under test to the instrument” (p. 36)
Connect test leads to terminals T1 and T2. See “5.1 Connecting the Test Lead”
(p. 75)
Position the tips of test leads on the enclosure of the equipment under test.
During manual measurement, touch current (enclosure – enclosure) measurement
starts upon return to the measurement screen. Measurement conditions can be
changed during measurement. See “6.1 Making manual measurements” (p. 79)
During automatic measurements,
becomes available upon return to the measurement
screen. Press
to start touch current (enclosure – enclosure) measurement.
Only
is available during automatic measurements.
2
4
Terminals T1, T2, and enclosure
1 3
HIOKI ST5540A981-09
87
6.3 Measurement examples
When network B1 or B2 (Other test condition, Special test condition) is
selected and measurement conducted with 110% voltage application
(,
)
· Note that when
is pressed in automatic measurement mode, the
instrument generates high voltage without
displayed on the screen.
· To avoid the risk of electric shock when a test lead is connected to the T3 terminal, do not touch the part of the test lead that is beyond the finger barrier. The T3 terminal outputs high voltages.
Do not touch any part of the test lead beyond the finger barrier
The terminal block is not used for internally powered equipment. However,
power must be supplied to this instrument’s [LINE IN] connector to obtain high
voltage from Terminal T3.
Do not connect the equipment under test to an outlet or the terminal block since
power is supplied from an outlet during a 110% voltage application test.
1. Connect the instrument and the equipment under test.
See “3.3 Connecting equipment under test to the instrument” (p. 36) Connect test leads to terminals T1, T2 and T3.
6
See “5.1 Connecting the Test Lead” (p. 75) Position the tip of the test lead connected to terminal T1 and T2 on the enclosure of the equip-
ment under test.
4. Position the tip of the test lead connected to terminal T3 on an
ungrounded signal input section
or signal output section of the equipment under test.
5. During manual measurement,
is available upon return to the measurement screen. Press
Chapter 6 Measurements
to start touch current (enclosure – enclosure) measurement during a single- fault condition.
Pressing
applies a high voltage to the test lead connected to the T3 terminal.
Press
to terminate output of high voltage.
During automatic measurements,
becomes available upon return to the measurement
screen. Press
to start touch current (enclosure – enclosure) measurement under the sin-
gle-fault condition.
Only
is available during automatic measurements.
25
Terminal T3 and I/O terminal
1
Terminals T1, T2, and enclosure
3 4
HIOKI ST5540A981-09
88
6.3 Measurement examples
Enclosure – Line measurement*
*only when selecting a network other than B1 or B2
· Note that when
is pressed in automatic measurement mode, the
instrument generates high voltage without
displayed on the screen.
· To avoid the risk of electric shock when a test lead is connected to the T2
terminal, do not touch the part of the test lead that is beyond the finger
barrier. The T2 terminal outputs high voltages.
Do not touch any part of the test lead beyond the finger barrier
· Conduct leakage current measurement between enclosure and enclosure using two ungrounded locations on the enclosure.
· A pre-check is made to prevent a ground fault when
is pressed.
Measurement ends if the check determines a ground fault has occurred.
· If the probe is brought into contact with protective ground after the pre- check,
a ground fault will occur and the measurement fuse is blown.
· When the protective grounding wire is disconnected (single fault), a protec-
tively earthed enclosure is handled as a non-protectively earthed enclosure.
1. Connect the instrument and the equipment under test.
See “3.3 Connecting equipment under test to the instrument” (p. 36) Connect a test lead to terminal T2.
3. Position the tip of the test lead on the enclosure of the equipment u
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>