HT9012 Clamp Meter Digital CAT III 1000 V User Manual
- June 5, 2024
- HT
Table of Contents
HT9012 Clamp Meter Digital CAT III 1000 V User Manual
SAFETY PRECAUTIONS AND PROCEDURES
This clamp complies with IEC/EN61010-1. For your own safety and in order to avoid damaging the instrument, you’re recommended to keep to the instructions contained in this manual and read carefully all the notes preceded by the symbol
Take extreme care for the following conditions while measuring:
- Do not measure voltage or current in humid or wet environment
- Do not use the meter in presence of explosive gas (material), combustible gas (material), steam or dust
- Insulate yourself from the object to be tested
- Do not touch exposed metal (conductive) parts such as test lead ends, sockets, fixing objects, circuits, etc
- If you detect anomalies of testing end (metal part) and attachment of the meter such as breakages, deformations, foreign substances, no display, etc., do not take any measurement
- Measuring voltage over 20V as it might cause human body electricity conduction
The followings symbols are used:
Caution: refer to the instruction manual. An incorrect use may damage the
tester or its components
High Voltage ranger: electrical shock risk
Double insulated instrument
AC Voltage or Current
DC Voltage
Ground reference
PRELIMINARY
- This apparatus has been designed for use in an environment of pollution degree 2. Indoor use
- It measures CURRENT and VOLTAGE on CAT IV 600V to ground plants. For over voltage categories please see § 1.4
- You must comply with the usual safety regulations aimed at trotecting you against the dangerous electric current and protecting the instrument against an incorrect operation
- Only the leads supplied with the instrument guarantee compliance with the safety standard. They must be in good conditions and they must be replaced, if necessary, with an identical model
- Do not test or connect to any circuit whose voltage or current exceeds the specified overload protection
- Do not perform any test at environmental conditions exceeding the limits indicated
- Make sure that the battery are installed correctly
- Before connecting the test probes to the installation, check that the function selector is positioned on the required measurement
- Make sure that the LCD and the rotate switch show the same as the function desired
BEFORE USE
Always keep to the instructions contained in this manual:
CAUTION
Non compliance with the warnings and/or the instructions may damage the tester and/or its components or injure the operator.
- Before changing the switch’s position, take off the clamp jaw from the tested conductor or the electrical circuit in order to avoid any accident
- When the clamp is connected to the circuits to be tested, never touch unused terminals
- When testing resistors, do not add voltage. Although there is a protection circuit, excessive voltage would cause malfunctioning
- Before measuring current, remove the voltage-resistance test leads
- When measuring current, any strong current near or close to the clamp jaw will affect the accuracy
- When measuring current, always put the tested conductor in the middle of the clamp jaw in order to obtain a more accurate reading
- If the reading value or the sign indication remains unchanged during the measurement, check if the HOLD function is active.
AFTER USE
- Once the measurements are completed, turn the rotary switch to OFF
- If you expect not to use the clamp for a long time, remove the battery
MEASURING (OVERVOLTAGE) CATEGORIES DEFINITIONS
The norm IEC/EN61010-1: Safety requirements for electrical equipment for measurement, control and laboratory use, Part 1: General requirements, defines what measuring category, usually called overvoltage category, is. On § 6.7.4: Measuring circuits, it says:
(OMISSIS)
circuits are divided into the following measurement categories:
-
Measurement category IV is for measurements performed at the source of the lowvoltage installation
Examples are electricity meters and measurements on primary overcurrent protection devices and ripple control units -
Measurement category III is for measurements performed in the building installation
Examples are measurements on distribution boards, circuit breakers, wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and equipment for industrial use and some other equipment, for example, stationary motors with permanent connection to fixed installation -
Measurement category II is for measurements performed on circuits directly connected to the low voltage installation
Examples are measurements on household appliances, portable tools and similar equipment -
Measurement category I is for measurements performed on circuits not directly connected to MAINS
Examples are measurements on circuits not derived from MAINS, and specially protected (internal) MAINS-derived circuits. In the latter case, transient stresses are variable; for that reason, the norm requires that the transient withstand capability of the equipment is made known to the user
GENERAL DESCRIPTION
HT9012 meter can performs the herewith measurements:
- DC and AC voltage
- Detection of AC voltage without contact
- AC current
- Resistance and test continuity
- Diode test
Each parameter can be selected by rotating the 8-positions switch included OFF
position.
To abilitate the hold function the HOLD key is available. There are also key
to activate/desactivate the display backlight, the RANGE key for manual
selction of measurement ranges, the MAX key for maximum value measurement of
some parameters and the MODE key for the selection of different features
common at the same position of selector rotation. The selected quantity
appears on a high-contrast liquid crystal display with indication of
measurement units and functions. The instrument disposes of an Auto Power Off
function consisting in an automatic switching off 15 minutes after last
selector rotation.
TRMS AND MEAN VALUE MEASURING INSTRUMENTS
Safety testers for alternate quantities are divided into two big families:
- MEAN VALUE instruments: instruments which measure only the value of the wave at the fundamental frequency (50 or 60 Hz)
- TRUE ROOT MEAN SQUARE instruments, also defined as TRMS: instruments which measure the true root mean square value of the quantity under test
In presence of a perfectly sinusoidal wave, both families provide identical results. In presence of distorted waves, instead, the readings are different. Mean value instruments provide only the value of the fundamental wave while True RMS instruments provide the value of the entire wave, including harmonics (within the passband of the instrument). Accordingly, if the same quantity is measured with both kinds of instruments, the measured values are identical only if the wave is purely sinusoidal. Should it be distorted, True RMS instruments provide higher values than medium value instruments.
TRUE ROOT MEAN SQUARE VALUE AND CREST FACTOR DEFINITIONS
The current effective value is defined as follows: “In an interval of time equivalent to a period, an alternate current with effective value having an intensity of 1A, by passing on a resistor, disperses the same energy which would be dispersed in the same period of time by a direct current having an intensity of 1A”. From this definition comes the numerical
expression: The effective value is indicated as RMS (root mean square).
The Crest Factor is defined as the ratio between the Peak Value of a signal and its effective value: This value varies according to the waveform of the signal, for a purely sinusoidal wave it’s worth In presence of distortions the Crest Factor assumes higher values as long as the wave distortion is higher.
PREPARATION FOR USE
INITIAL
The tester has been checked from a mechanical and electrical point of view before shipment.
Every care has been taken to make sure that the instrument reaches you in perfect conditions.
However, it’s advisable to make a rapid check in order to detect eventual damages which may have occurred in transit. Should this be the case, enter immediately the usual claims with the carrier.
Make sure that all the accessories listed in § 6.3.1 are contained in the package. In case of discrepancies contact the dealer.
In case of returning of the tester please keep to the instructions given in § 7.
POWER SUPPLY
The instrument is battery supplied. One battery 9V IEC 1604 NEDA 6F22 are
included in the package. When battery is low, the symbol appears on the
display. Replace it immediately, following the instructions given in § 5.2.
The instrument disposes of the Auto Power OFF function (not disable)
consisting in an automatic switching off 15 minutes of idleness.
CALIBRATION
The tester complies with the technical features listed in this manual. Its performances are guaranteed for one year.
STORAGE
In order to guarantee the accuracy of the measurements, after a period of storage in extreme environmental condition, wait for the necessary time so that the tester returns to normal measuring conditions (see environmental specifications, § 6.2.1).
OPERATING INSTRUCTIONS
INSTRUMENT DESCRIPTION
Commands description
Fig. 1: Instrument description
LEGEND:
- Clamp jaw
- Red LED for AC voltage detection without contact
- Clamp trigger
- Rotary function selector
- HOLD key
- **** backlight key
- LCD display
- MODE key
- MAX key
- RANGE key
- COM input jack
- input jack
- Battery cover
Alignment marks
Put the conductor within the jaws on intersection of the indicated marks as much as possible (see Fig. 2) in order to meet the meter accuracy specifications.
Fig. 2: Alignment marks
LEGEND
- Alignment marks
- Conductor
FUNCTION KEY DESCRIPTION
HOLD key
By pushing HOLD key the parameter’s measured value is frozen on the display and the symbol “HOLD” appears on it. Pushing HOLD key another time deactivates this mode.
Key
By pushing and hold key for about 1s it’s possible to activate the backlight function on the display. By pressing and hold key again for about 3s to exit from the function or waiting the automatically disable after about 20 seconds. The function is available on each position of the rotary selector.
RANGE key
By pushing RANGE key, the manual mode is activated and the “AUTO” symbol
disappears from the display. Press RANGE cyclically to change the measuring
range and fix the decimal point on the display. For reading more than the
maximum range the “OL” indication is shown at display. To exit this function
keep RANGE key pressed for at least 1 second or rotate the selector to another
position. This feature is disabled for AC current diode test and continuity
test measurements.
MAX key
By pushing MAX key, maximum value are measured. The symbol corresponding “MAX” is displayed. This value is stored and automatically updated as soon as an higher value is measured by meter. Press MAX key again or rotate the selector to another position to exit from this function. This feature is disabled for resistance, diode test and continuity test measurements.
MODE key
By pushing MODE key the selection of a double measured functions which are present at display is possible. In particular this key is active only in ****position to select among resistance test, diode test and continuity test.
FUNCTIONS OF ROTARY SWITCH DESCRIPTION
DC Voltage measurement
CAUTION
Maximum input for AC Voltage measurements is 1000VDC or 1000VACrms. Do not take any voltage measurement exceeding this limit in order not to risk electrical shock or damaging the meter.
Fig. 3: Taking DC voltage measurement
- Rotate the switch on V position. The “DC” symbol is shown at display
- Pressing the RANGE key to select the correct range or using the Autorange feature (see § 4.2.3). If the voltage value under test is unknown, select the highest range
- Insert the red test lead plug into ****jack and the black test lead plug into COM jack
- Connect the two long ends of test leads to the desired circuit (see Fig. 3) then reading will be displayed
- “OL” message is shown at display if the DC voltage under test is over the maximum value that the instrument is able to measure
- The “-“ symbol at display means that the voltage have an opposite sign respect the connection of Fig. 3)
- For HOLD and MAX features please refer to § 4.2
AC Voltage measurement
CAUTION
Maximum input for AC Voltage measurements is 1000VDC or 1000VACrms. Do not take any voltage measurement exceeding this limit in order not to risk electrical shock or damaging the meter.
Fig. 4: Taking AC voltage measurement
- Approach the meter closest to AC source and note the turn on of red LED which is placed to the bottom of clamp jaws (see Fig. 1 – part 2) which detect the AC voltage
- Rotate the switch on V position. The “AC” symbol is shown at display
- Pressing the RANGE key to select the correct range or using the Autorange feature (see § 4.2.3). If the voltage value under test is unknown, select the highest range
- Insert the red test lead plug into ****jack and the black test lead plug into COM jack (see Fig. 4)
- Connect the two long ends of test leads to the desired circuit (see Fig. 4) then reading will be displayed
- “OL” message is shown at display if the AC voltage under test is over the maximum value that the instrument is able to measure
- For HOLD and MAX functions please refer to § 4.2
AC Current measurement
CAUTION
Make sure that all the test leads are disconnected from the meter terminals] for current measurement.
Fig. 5: Taking AC current measurement
- Approach the meter closest to AC source. The turn on of red LED which is placed to the bottom of clamp jaws (see Fig. 1 – part 2) detect the AC voltage
- Rotate the switch on position on a measurement range between 2A and 600A . If the current value under test is unknown, select the highest range
- Put the conductor to be tested inside to the center of clamp jaw to perform accurated measurements. Consider the notches on jaws as reference (see Fig. 2). The current value is shown at display
- “OL” message is shown at display the current under test is over the maximum value that the instrument is able to measure
- For HOLD and MAX functions please refer to § 4.2
Resistance measurement
CAUTION
Before taking any in circuit resistance measurement, remove power from the circuit to be tested and discharge all the capacitors.
Fig. 6: Taking resistance measurement
- Rotate the switch on ****position. The “ Ω ” symbol is shown at display
- Pressing the RANGE key to select the correct range or using the Autorange feature (see § 4.2.3). If the resistance value under test is unknown, select the highest range
- Insert the red test lead plug into ****jack and the black test lead plug into COM jack
- Connect the two long ends of test leads to the desired circuit (see Fig. 6) then reading mvalue of resistance will be displayed
- When “OL” symbol is displayed, the resistance under test is over the maximum value that the instrument is able to measure
- For HOLD function please refer to § 4.2
Continuity test and Diode test
CAUTION
Before taking any in circuit resistance measurement or diode test, remove power from the circuit to be tested and discharge all the capacitors.
Fig. 7: Taking continuity test and diode test
- Rotate the switch on ****position
- Pushing MODE key and select continuity test. The symbol is shown at display
- Insert the red test lead plug into ****jack and the black test lead plug into COM jack and perform continuity test on the object on test (see Fig. 7 – left side). Buzzer emits sound if the measured resistance value is less about 100
- Pushing MODE key and select diode test. The symbol is shown at display
- Connect the red test leads to the anode of diode on test and the black test lead on the cathode ones (see Fig. 7 – right side)
- Displayed values within 0.4V and 0.7V (direct junction) and “OL” (reverse junction) are correspondent to a correct result. A “0mV” value means a shorted device while a “OL” indication in both side means a broken device
MAINTENANCE
GENERAL INFORMATIONS
- This digital clamp meter is a precision instrument. Whether in use or in storage, please do not exceed the specification requirements to avoid possible damages or dangers
- Do not place this meter at high temperatures or humidity or expose it to direct sunlight
- Be sure to turn off the meter after use. If you expect not to use the tester for a long time, remove the battery in order to avoid leakages of battery liquid that would damage the internal parts
BATTERY REPLACEMENT
When ****symbol appears on the display, replace the battery
CAUTION
Only expert and trained technicians must perform this operation. Remove the test leads or the conductor under test before replacing the battery.
- Rotate the switch on OFF
- Remove the test leads or the objects to be tested
- Remove the screw from the battery cover, and detach the battery cover from the bottom cover
- Remove the battery
- Replace the battery with a same type new one
- Replace the battery cover and screw
- Use the appropriate battery disposal methods for Yr area
CLEANING
For cleaning the instrument use a soft dry cloth. Never use a wet cloth,
solvents or water, etc.
END OF LIFE
CAUTION: this symbol indicates that equipment, battery and its accessories shall be subject to a separate collection and correct disposal.
TECHNICAL SPECIFICATIONS
CHARACTERISTICS
Accuracy is calculated as [% rdg + (n°of dgt) * resolution] referred to: 23°C ± 5°C <80%RH
DC Voltage
Range| Resolution| Accuracy (50 60Hz)| Input
impedance| Overload protection
---|---|---|---|---
200.0mV| 0.1mV| (1.5%rdg + 15dgt)| 10M| 1000VDC/ACrms
2.000V| 0.001V| (1.0%rdg + 4dgt)
20.00V| 0.01V
200.0V| 0.1V
1000V| 1V
The meter emits a continuous sound with VDC >1000V
AC Voltage
Range| Resolution| *Accuracy ()| Frequency range|
Overload protection**
---|---|---|---|---
2.000A| 0.001A| (2.5%rdg + 10dgt)| 50 60Hz| 600Arms
20.00A| 0.01A| (2.5%rdg + 4dgt)
200.0A| 0.1A
600A| 1A| (3.0%rdg + 4dgt)
Integrated sensor for AC voltage detection: LED turn on for phase-earth
voltage > 100V, 50/60Hz
The meter emits a continuous sound on 1000V range for VAC>750V
AC Current
Range| Resolution| *Accuracy ()| Frequency range|
Overload protection**
---|---|---|---|---
2.000A| 0.001A| (2.5%rdg + 10dgt)| 50 60Hz| 600Arms
20.00A| 0.01A| (2.5%rdg + 4dgt)
200.0A| 0.1A
600A| 1A| (3.0%rdg + 4dgt)
(*) Referred to cable inside to the center of clamp jaws
Position sensitivity: 2.0%rdg
Resistance and Continuity test
Range| Resolution| Accuracy| Buzzer| Overload
protection
---|---|---|---|---
200.0| 0.1| (1.0%rdg + 5dgt)| ≤100| 600VDC/ACrms
2.000k| 0.001k
20.00k| 0.01k
200.0k| 0.1k
2.000M| 0.001M
20.00M| 0.01M| (2.0%rdg + 10dgt)
Diode test
| Features | Test current | Open voltage |
|---|
| 0.3mA typical| 1.5VDC
Safety
- Comply with: IEC/EN 61010-1
- Insulation: double insulation
- Pollution degree: 2
- For inside use, max height: 2000m (6562 ft)
- Installation category: CAT IV 600V, CAT III 1000V to ground
General data
Mechanical characteristics
- Dimensions (L x W x H): 215 x 74 x 43mm ; 8 x 3 x 2 in
- Weight (including battery): 285g (10 ounces)
- Max conductor size: 30mm (1in)
Supply
- Battery type: 1x9V alkaline battery NEDA 1604 IEC 6F22
- Low battery indication: ****is displayed when the battery level is too low
- AutoPower OFF after 15min of idleness (not disabled)
Display
- Characteristics: 3½ LCD (max 2000 points) plus decimal point, unit symbol indication and backlight
- Sample rate: 2 times/sec
- Conversion mode: Mean value
ENVIRONMENTAL CONDITIONS
Climatic conditions
- Reference temperature: 23° ± 5°C (73°F ± 41°F)
- Operating temperature: 5 ÷ 40°C (41°F ÷ 104°F)
- Operating humidity: <80%RH
- Storage temperature: -20 ÷ 60 °C (-4°F ÷ 140°F)
- Storage humidity: <80%RH
This product conforms to the prescriptions of the European directive on low voltage 2006/95/EEC and to EMC directive 2004/108/EEC
ACCESSORIES
Standard accessories
The content of a standard package is the following:
- Instrument HT9012
- Test leads – Cod. 4413-2
- Carrying bag
- Battery
- User manual
SERVICE
WARRANTY CONDITIONS
This instrument is guaranteed against material or production defects, in
accordance with our general sales conditions. During the warranty period the
manufacturer reserves the right to decide either to repair or replace the
product. Should you need for any reason to return back the instrument for
repair or replacement take prior agreements with the local distributor from
whom you bought it. Do not forget to enclose a report describing the reasons
for returning (detected fault). Use only original packaging. Any damage
occurred in transit due to non original packaging will be charged anyhow to
the customer.
The manufacturer will not be responsible for any damage to persons or things.
The warranty doesn’t apply to:
- Accessories and batteries (not covered by warranty).
- Repairs made necessary by improper use (including adaptation to particular applications not foreseen in the instructions manual) or improper combination with incompatible accessories or equipment.
- Repairs made necessary by improper shipping material causing damages in transit.
- Repairs made necessary by previous attempts for repair carried out by non skilled or unauthorized personnel.
- Instruments for whatever reason modified by the customer himself without explicit authorization of our Technical Dept.
The contents of this manual cannot be reproduced in any form without our
authorization.
Our products are patented. Our logotypes are registered. We reserve the right
to modify characteristics and prices further to technological developments.
SERVICE
Shouldn’t the instrument work properly, before contacting your distributor
make sure that battery is correctly installed and working, check the test
leads and replace them if necessary. Make sure that your operating procedure
corresponds to the one described in this manual.
Should you need for any reason to return back the instrument for repair or
replacement take prior agreements with the local distributor from whom you
bought it. Do not forget to enclose a report describing the reasons for
returning (detected fault). Use only original packaging. Any damage occurred
in transit due to non original packaging will be charged anyhow to the
customer.
The manufacturer will not be responsible for any damage to persons or things.