UNI-T UT511 Insulation Resistance Megger Meter User Manual

UT511 Insulation Resistance Megger Meter

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Specifications

• Safety and Compliances: IEC61010 safety measurement
  requirement

• Physical Specifications: Handheld

• General Specifications: CAT. III 600V, CAT.II 1000V, double
  insulation

Product Information

The Uni-Trend Model UT511 insulation resistance tester is
designed for resistance/insulation resistance measurement.

Product Usage Instructions

1. Unpacking the Meter

The Meter includes:

• English Operating Manual
• One plug test lead to one alligator
• Two plugs test lead to one alligator
• 1.5V Battery (R14 or LR14)
• Tool Box
• Power adaptor (optional, available at extra cost)

Check for missing or damaged items and contact your dealer if
needed.

2. Safety Information

The Meter complies with IEC61010 safety standards and has CAT.
III 600V, CAT.II 1000V ratings with double insulation. Follow the
safety instructions in the manual to avoid hazards and damage.

3. International Electrical Symbols

Refer to pages 4-5 of the Operating Manual for explanations of
the symbols used on the Meter.

4. Battery Saver (Sleep Mode)

The Meter features a battery saver mode to prolong battery life
when not in use. Refer to the manual for instructions on activating
and deactivating this mode.

5. Key Functions

Learn about the key functions of the Meter for accurate
measurements. Functions include measuring voltages, insulation
resistance, and low resistance.

6. Measurement Operation

Perform measurements using the Meter:

• A. Measuring Voltages: Follow the steps
  outlined in the manual for voltage measurements.

• B. Measuring Insulation Resistance:

  • a) Continuous Measurement
  • b) Timed Measurement
  • c) Polarization Index (PI) Measurement
  • d) Compare Function

• C. Low Resistance Measurement: Utilize the
  Meter for low resistance measurements as per the manual
  instructions.

FAQs

Q: How do I know if the battery needs replacement?

A: The Meter will indicate when the battery is low. Refer to the
Battery Indication section in the manual for details on
interpreting battery status.

Q: Can I use a power adaptor with the Meter?

A: Yes, a power adaptor can be used with the Meter. Refer to the
section on The Use of Power Adaptor for instructions on using it
with the Meter.

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Model UT511 OPERATING MANUAL

Model UT511: OPERATING MANUAL
TITLE
Introduction Unpacking the Meter Safety Information International Electrical Symbols Battery Saver (Sleep Mode) Battery Indication The Meter Structure Display Key Functions Measurement Operation
A.Measuring Voltages B.Measuring Insulation Resistance
a) Continuous Measurement b) Timed Measurement c) Polarization Index (PI) Measurement d) Compare Function C. Low Resistance Measurement

PAGE
5 5 5 7 8 8 9 10 12 15 15 16 17 18 18 19 20
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Model UT511: OPERATING MANUAL

TITLE
The Use of Power Adaptor Maintenance
A. General Service B. Replacing the Battery Specifications Safety and Compliances Physical Specifications General Specifications Feature Summary Detailed Accuracy Specifications A. Voltage Measurement B. Insulation Resistance Measurement C. Low Resistance Measurement

PAGE
21 22 22 22 24 24 24 25 25 26 26 26 27

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Model UT511: OPERATING MANUAL
Table 1. 2. 3. 4. 5. 6. 7.

Title
Unpacking Inspection International Electrical Symbols Battery Indication Meter Front Description Meter Side Description Display Description Key Description

Page
5 7 8 9 10 11 12

3

Figure
1. 2. 3. 4. 5. 6. 7. 8.

Model UT511: OPERATING MANUAL

Title
The Meter Front Structure The Meter Side Structure The Display Voltage Measurement Insulation Resistance Measurement Low Resistance Measurement The Use of Power Adaptor Battery Replacement

Page
9 10 10 15 16 20 21 23

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Model UT511: OPERATING MANUAL

Introduction
Uni-Trend Model UT511 insulation resistance tester (hereafter, “the Meter”) is a handheld instrument designed primarily to make resistance/ insulation resistance measurement.

Unpacking the Meter The Meter includes the following items:
Table 1. Unpacking Inspection

Item 1 2 3
4 5 6

Description English Operating Manual One plug test lead to one alligator Two plugs test lead to one alligator 1.5V Battery (R14 or LR14) Tool Box Power adaptor (optionally, available at extra cost)

Qty 1 piece 2 pieces 1 piece
8 pieces 1 piece 1 piece

In the event you find any missing or damage, please contact your dealer immediately.

Safety Information
This Meter complies with the standards IEC61010 safety measurement requirement: in pollution degree 2, overvoltage category (CAT. III 600V, CAT.II 1000V) and double insulation.
CAT II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient voltage overvoltages than CAT. III CAT III: Distribution level, fixed installation, with smaller transient overvoltages than CAT. IV
Use the Meter only as specified in this operating manual, otherwise the protection provided by the Meter may be impaired.
Danger identifies conditions and actions that pose hazard(s) to the user. Warning identifies avoiding electric shock. Caution identifies conditions and actions that may damage the Meter and carrying out accurate measurement.
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Model UT511: OPERATING MANUAL

International electrical symbols used on the Meter and in this Operating Manual are explained on page 4~5.
Danger
Use of instrument in a manual not specifed by the manufactuer may impair safety features/ protection provided by the equipment. Read the following safety information carefully before using or servicing the instrument.
l Do not apply more than 1000VDC or 750V AC. l Do not use the Meter around explosive gas,
vapor or dust. l Do not use the Meter in a wet environment. l When using the test leads, keep your figures
away from the lead contacts. Keep your figures behind the finger guards on the leads. l Do not use the Meter with any parts or cover removed. l When carrying out insulation measurement, do not contact the circuit under test.
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Warning
l Do not use the Meter if it is damaged or metal part is exposed. Look for cracks or missing plastic.
l Be careful when working above 30V rms, 42V ac rms and 60V DC. Such voltages pose a shock hazard.
l Discharge all loading of circuit under test after measuring high voltage.
l Do not change battery when the Meter is in wet environment.
l Place test leads in proper input terminals. Make sure all the test leads are firmly connected to the Meter’s input terminals. Make sure the Meter is turned off when opening the battery compartment.
Caution
l When performing resistance tests, remove all power from the circuit to be measured and discharge all the power.

Model UT511: OPERATING MANUAL

l When servicing the Meter, use only the same model number or identical electrical specifications of test leads and power adaptor.
l Do not use the Meter if the battery indicator ( ) shows a battery empty condition. Take the battery out from the Meter if it is not used for a long time.
l Do not use or store the Meter in an environment of high temperature, humidity, explosive, inflammable and strong magnetic field. The performance of the Meter may deteriorate after dampened.
l Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing. No abrasive and solvent should be used to prevent the surface of the Meter from corrosion, damage and accident. Dry the Meter before storing if it is wet.

International Electrical Symbols International symbols on the Meter and in this manual are explained in Table 2.
Table 2. International Electrical Symbols
Risk of electric shock Equipment protected by double or reinforced insulation. DC Measurement AC Measurement Grounding See Manual Empty of Built-In Battery Conforms to Standards of European Union

7

Model UT511: OPERATING MANUAL

Battery Saver (Sleep Mode)
The Meter enters the Sleep Mode and blanks the display if there is no button press for 15 minutes. This is done to conserve battery power. The Meter comes out of Sleep Mode when ON/OFF button is pressed two times.
The 15 minutes timer is disabled during any insulation resistance measurement. The time period starts immediately following any measurement.

Battery Indication There is a battery indicator shows on the display upper left hand corner. Below Table 3 is the explanation:
Table 3. Battery Indication
Battery Battery Voltage Indicator
8.5V or less. It means the battery is empty, don’t use the Meter as it cannot guarantee accuracy. 8.6V~9.0V. It means the battery is nearly empty, replacing battery is necessary. Accuracy will not be affected. 9.1V~10.2V 10.3V or more

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Model UT511: OPERATING MANUAL The Meter Structure Below Figure 1 and Table 4 shows the Meter front structure and description
Figure 1. The Meter Front Structure

Table 4. Meter Front Description

1 LCD

12 Test Button

2

Scroll Button

13 Step Button

3 Emergency stop

14 Data Store Button.

4 Data Clear the

15 Data Recall Button

Display Backlight

Button,

5

Down Button

16 Scroll Button

6 On/Off Button

17 Up Button

7 Compare Button

18 LINE: Resistance

input terminal

8 Insulation Resistance 19 COM: Voltage input

Button

terminal

9 Voltages

20 EARTH: Resistance

measurement Button

input terminal

10 Timer Button.

21 V: Voltage input

terminal

11 Low Resistance

22 Testing leads

measurement Button

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Model UT511: OPERATING MANUAL

Below Figure 2 and Table 5 shows the Meter side structure and description

Display Table 6 and Figure 3 describe the display.

Figure 2. The Meter Side Structure (Side View)

1 2
10

Table 5. Meter Side Description Safety Shutter Power adaptor Input Terminal

Figure 3. Display

Model UT511: OPERATING MANUAL

Number 1 2 3 4 5 6 7
8 9 10 11

Table 6. Display Description

Meaning Indicator for DC voltage Indicator for data store full Indicator for clearing Indicator for AC voltage Indicator for timer Step symbol Indicates selected pass/fail compare value Indicates for negative reading Timer 1 symbol Timer 2 symbol Data store is on

Number 12 13 14 15 16 17 18
19 20 21

Meaning Data recall is on Indicator for polarization index Unit symbols The continuity buzzer is on Compare feature pass Analogue bar graph Risk of electric shock
Compare feature fail Indicator for power adaptor Battery life indicator

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Model UT511: OPERATING MANUAL

Key Functions

Table 7. Key Description

ON/OFF CLEAR/ SAVE
LOAD

Turn on or off the Meter. Press and hold the button for 1 second to turn the Meter on. Press to clear the stored data,Push 1 SEC to turn on and off the display backlight. Press to store the current measurement value. The maximum number of stored reading is 18. When the stored readings memory is full, the Meter shows FULL and stop storing. Press CLEAR to clear the stored value in order to store the next measurement value. l Press once to recall the first stored
value. l Press again to exit Load feature. l Load feature can only be used when
there is no high voltage output.

l Under insulation resistance measurement mode: press to select one voltage range up.
l Under load mode: press to recall the previous stored value.
l Under insulation resistance measurement mode: press to select one voltage range down.
l Under load mode: press to recall the next stored value.
l When set the timer duration for the measurement of insulation resistance or polarization index, press to decrement the time. The maximum length of time is 30 minutes, the Meter will automatically carry out measurement.

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Model UT511: OPERATING MANUAL

Table 7. Key Description

l When compare feature measuring insulation resistance, press to decrement a resistance comparing value.
l After polarization index measurement, press to display polarization index, TIME 2 insulation resistance value and TIME 1 insulation resistance value in sequence.
l When set the timer duration for the measurement of insulation resistance or polarization index, press to increment the time. The maximum length of time is 30 minutes, the Meter will automatically carry out measurement.
l When use the compare feature measuring insulation resistance, press to increment a resistance comparing value.

STEP

l After polarization index measurement, press to display polarization index, TIME 2 insulation resistance value and TIME 1 insulation resistance value in sequence.
Press to display S1 S2 S3 in sequence. l When the Meter is under timed
measurement or polarization index measurement:
S1 means increment of 1, then each press of increase 1 or decrease 1. S2 means increment of 10, then each press of increase 10 or decrease 10. S3 means increment of 30, then each press of increase 30 or decrease 30.

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Model UT511: OPERATING MANUAL

Table 7. Key Description

STEP
COMP TIME TEST Ho

l When the Meter is under compare mode: S1 means increment of 1, then each press of increase 1 or decrease 1. S2 means increment of 10, then each press of increase 10 or decrease 10. S3 means increment of 100, then each press of increase 100 or decrease 100.
Set a pass / fail limit for insulation tests. The default value is 100M Pres to step through continuous measurement, timed measurement and polarization index measurement in sequence. Press to stop or start an insulation resistance test Press to initiate insulation resistance measurement

Lo
DVC /ACV

Press to initiate low resistance measurement Pres to initiate voltages measurement

E-STOP Emergency stop button. Press this button when the Meter is hang and cannot turn off the power.

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Model UT511: OPERATING MANUAL

Measurement Operation Below section explains how to make measurements. A. Measuring Voltages
Black
Red
Figure 4. Voltages Measurement

Caution
l Special care should be taken when measuring high voltage.
Warning
l To avoid harms to you or damages to the Meter, please do not attempt to measure voltages higher than 1000V DC or 750V AC, although readings may be obtained.
To measure voltages, set up the Meter as Figure 4 and do the following:
1. Press DCV or ACV button to select DC voltage or AC voltage measurement
2. Insert the red test lead into the V terminal and the black test lead into the COM terminal.
3. Connect the red and black alligator clip to the circuit to be measured.
4. During measurement, when the red test lead is negative voltage, then “-” shows on the display.
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Model UT511: OPERATING MANUAL

Note
l When voltage measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove testing leads away from the input terminals of the Meter.

B. Measuring Insulation Resistance
Red

Black
Figure 5. Insulation Resistance Measurement
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Model UT511: OPERATING MANUAL

Caution
l When performing insulation resistance tests, remove all power from the circuit to be measured and discharge all the power.
l Do not short circuit two test leads under high voltage status.
l Do not measure insulation resistance after high voltage output.
l Do not measure over 10 seconds when: 100V measure resistance lower than 500k 250V measure resistance lower than 1M 500V measure resistance lower than 2M 1000V measure resistance lower than 5M
l When the measurement is completed, don’t touch the circuit as the circuit has already stored capacitance which may cause electric shock.
l Don’t touch the test leads even after it has been removed from the circuit until voltages are all released.

To measure insulation resistance, set up the Meter as Figure 5 and do the following:
1. Press HO button to select insulation resistance measurement.
2. Press and button to select voltages of 100V, 250V, 500V or 1000V.
3. Insert the red test lead into the LINE terminal and the black test lead into EARTH terminal.
4. Connect the red and black alligator clip to the circuit to be measured, positive voltage output from LINE terminal.
5. Choose below insulation resistance measurement mode.
l Press TIME button to select continuous measurement mode, there is no timer icon on the LCD.
l Press and hold TEST button for 1 second to carry out continuous measurement. Output insulation resistance testing voltage, TEST button light up, blinks on every 0.5 seconds.
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Model UT511: OPERATING MANUAL

Press TEST button to close the insulation resistance measurement voltage when measurement is completed. TEST button lights off , disappears. The LCD shows the current insulation resistance measurement value.
l Press TIME button to select timed measurement mode, the LCD displays TIME 1 and symbols.
l Press , and STEP buttons to set the time (00:05~29:30).
l Then press and hold TEST button for 1 second to carry out timed measurement. TIME 1 and are displayed and blinked on the LCD on every 0.5 seconds.
l When the set time is reached, the insulation resistance measurement voltage will be closed and the measurement will be automatically stopped. The LCD displays the insulation resistance reading.
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l Press TIME button to select timed measurement mode, the LCD displays TIME 1 and symbols.
l Press , and STEP buttons to set the time (00:05~29:30).
l Press TIME button again. TIME 2, PI and symbols appear on the LCD.
l Press , and STEP buttons to set the time (00:10~30:00).
l Then press and hold TEST button for 1 second to carry out timed measurement.
l TIME 1 and are displayed and blinked on the LCD on every 0.5 seconds before TIME 1 set time is reached.
l TIME 2 and are displayed and blinked on the LCD on every 0.5 seconds before TIME 2 set time is reached.
l When the two set time are reached, the insulation resistance measurement voltage will be closed and the measurement will be automatically stopped. The LCD displays the polarization index reading.

Model UT511: OPERATING MANUAL

l Press , to set through the polarization index, TIME 2 insulation resistance reading and TIME 2 insulation resistance reading.
Information: PI = 3 minutes ~10 minutes reading / 30 second ~1 minutes reading

PI

4 or more 4~2 2.0~1.0 1.0 or less

Standard The best Good Warning Bad

l Press COMP button to select compare feature. COMP symbol displays on the LCD.
l Press , and STEP buttons to set the compare value. The minimum value is 1M The maximum value is the maximum tested voltage allowable measurement value.
l Press and hold TEST button for 1 second to carry out the measurement.
l The NG symbol will display if the insulation resistance value is smaller than resistance value. Otherwise GOOD symbol will be displayed.
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C. Low Resistance Measurement
Red
Black
Figure 6. Low Resistance Measurement
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Model UT511: OPERATING MANUAL
Caution
l When performing insulation resistance tests, remove all power from the circuit to be measured and discharge all the power.
To measure low resistance, set up the Meter as Figure 6 and do the following:
1. Press LO button to select low resistance measurement..
2. Insert the red test lead into the LINE terminal and the black test lead into EARTH terminal.
3. Connect the red and black alligator clip to the circuit to be measured. When the resistance is less than 30 the buzzer sounds.
4. This range can test LED diode. Connect the anode LED diode to the red test lead, the LED diode will light up if it is good. If the LED diode does not light up, it means it is damaged.

Model UT511: OPERATING MANUAL The Use of Power Adaptor The use of power adaptor, see figure 7
Figure 7. The Use of Power Adaptor

1. Open the side safey shutter, then you will see there is a power adaptor input terminal.
2. Make sure the Meter is power off and Insert the UT511 power adaptor to the input terminal.
3. It is highly recommed to take out all the batteries when you are using the power adaptor.
4. Make sure the Meter is power off when you disconnect the UT511 power adaptor from the Meter. (Input voltage 230VAC, Frequency 50/60Hz, Input current 50mA, Output voltage DC 15V, MAX current 600mA)
Caution
If you want to choose power adaptor for power supply, please use special power adaptor SA48-150060EU which supported by our company, otherwise it will be dangerous.
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Model UT511: OPERATING MANUAL

Maintenance
This section provides basic maintenance information including battery replacement instruction.
Warning Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information.
A. General Service l Periodically wipe the case with a damp cloth and
mild detergent. Do not use abrasives or solvents. l To clean the terminals with cotton bar with detergent,
as dirt or moisture in the terminals can affect readings. l Turn the Meter to OFF when it is not in use. l Take out the battery when it is not using for a long
time. l Do not use or store the Meter in a place of humidity,
high temperature, explosive, inflammable and strong magnetic field. l If the Meter is wet, dry it before use.
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B. Replacing the Battery
Warning To avoid electric shock, remove all the test leads from the Meter when replacing the batteries.
Caution l Don’t mix to use old and new batteries. l Be careful the polarity is correct when installing
batteries. l Do not use the Meter if the battery indicator
( ) shows a battery empty condition.

Model UT511: OPERATING MANUAL Figure 8. Battery Replacement

Follow Figure 8 and proceed as follows to replace the battery: l Turn the Meter to OFF and remove all connections
from the terminals. l Remove the screw from the battery compartment,
and separate the battery compartment from the case bottom. l There are 8pcs of 1.5V (R14) carbon battteries in the meter, except this, it can support 1.5V (LR14) alkalescence batteries and the special power apapter which our company provided. l Rejoin the case bottom and battery compartment, and reinstall the screw.
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Model UT511: OPERATING MANUAL

Specifications
Safety and Compliances
Certification Compliances IEC 61010 CAT.II 1000V, CAT.III 600V overvoltage and double insulation standard

Physical Specifications Display (LCD) Operating Temperature Storage Temperature Relative Humidity
Battery Type
Dimensions (HxW xL) Weight

Digital: 9999 counts Analog bar graph. -10 ~40 (14 ~104 ) -20 ~60 (-4 ~140 )
85% @ -10 ~40 below; 90% @ -20 ~60 : 8pcs of 1.5V (R14 or LR14) batteries or DC15V power adaptor. DC15V power adaptor is optionally at extra cost. 202 x 155 x 94 mm Approx. 2kg (including battery)

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Model UT511: OPERATING MANUAL

General Specifications
Range Overloading Battery Indicator Icon Display Current Consumption
Feature Summary
Display Backlight Autorange Warning Voltage COMP Measurement
PI Measurement

Auto Display OL on insulation resistance range Display Equips with function and battery indicator icons. Maximum: around 90mA Average: around 20mA
Bright backlight for clear readings in poorly lighted areas. The Meter automatically selects best range
and red light will on. Auto release voltage Use the Compare function to set a pass/fail compare level for the insulation measurements. Polarization Index is the ratio of insulation resistance. You can pre-set two point of times and automatically carry out the measurement.

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Model UT511: OPERATING MANUAL

Detailed Accuracy Specifications Accuracy: ([% of reading] + [number of least significant digits), guarantee for 1 year. Operating temperature: 18 ~28 Relative humidity: 45~75%RH
A. Voltage Measurement

Measurement Range Resolution Accuracy

DC Voltage 30 ~ 1000V
1V (2%+3)

AC Voltage 30V~750V (50/60Hz)
30~100V (2%+5) 100~750V (2%+3)

B. Insulation Resistance Measurement

Output Voltage Display Range

100V 0.1M ~99.9M 100~500M

Open Circuit Voltage DC100V + 20%,-0%

Test Current

1mA~1.2mA@100k

Short Circuit

Accuracy

100k

250V 0.5M ~99.9M 100~999M 1.00~1.99G DC250V + 20%, -0% 1mA~1.2mA@250k

500V

1000V

1M ~99.9M

2M ~99.9M

100~999M

100~999M

1.00~3.99G

1.00~10.00G

DC 500V + 20%, -0% DC1000V + 20%, -0%

1mA~1.2mA@500k 1mA~1.2mA@1M

Around 2.0mA to 100M : (3%+5) 100M above: (5%+5)

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Model UT511: OPERATING MANUAL

Caution At any output voltage, when the tested resistance is les than 5M, the testing time cannot exceed 10 seconds.
C. Low Resistance Measurement

Function Measurement Range Resolution Accuracy Maximum open circuit voltage Buzzer Overload Protection

Resistance 0.1~999.9 0.1
(1%+3) Around 2.8V Open at less than 30 220V rms/10 seconds

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Model UT511: OPERATING MANUAL
END
This operating manual is subject to change without notice. 28

Model UT511: OPERATING MANUAL
Copyright 2006 Uni-Trend Group Limited. All rights reserved.
Manufacturer: Uni-Trend Technology (Dongguan) Limited Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town, Dongguan City Guang Dong Province China Postal Code: 523 925
Headquarters: Uni-Trend Group Limited Rm901, 9/F, Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon, Hong Kong Tel: (852) 2950 9168 Fax: (852) 2950 9303 Email: info@uni-trend.com http://www.uni-trend.com
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References

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