Unit UT516B Manuale utente
P/N:110401108715X
UT516B
Insulation
Resistance
Tester
User Manual
Preface
Thank you for purchasing the new UT516B insulation resistance tester. In order to use this product safely and
correctly, please read this manual thoroughly, especially the Safety Instructions part.
After reading this manual, it is recommended to keep the manual at an easily accessible place, preferably close
to the device, for future reference.
Limited Warranty and Liability
Uni-Trend guarantees that the product is free from any defect in material and workmanship within one year from
the purchase date. This warranty does not apply to damages caused by accident, negligence, misuse, modification,
contamination or improper handling. The dealer shall not be entitled to give any other warranty on behalf of
Uni-Trend. If you need warranty service within the warranty period, please contact your seller directly.
Uni-Trend will not be responsible for any special, indirect, incidental or subsequent damage or loss caused by
using this device.
UT516B User Manual
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3 4
1. Overview
The UT516B is a digital high voltage insulation resistance tester with 6 ranges: 500V, 1000V, 2500V, 5000V,
10000V and 12000V. Fine adjustment of voltage with 10% step at each range (except 12000V) is available.
Test data can be saved in the tester memory and transferred to a PC via the dedicated USB cable, or be
transferred to a PC in real time.
2. Features
Designed to meet IEC61010-1, CAT IV 600V and Pollution Degree 2 safety standards
For insulation resistance test, max test voltage: 12kV, max test resistance: 10TΩ, max short-circuit
current: 5mA
Automatic display of Dielectric Absorption Ratio (DAR) and Polarization Index (PI)
Large memory for saving up to 999 sets of test data
Dual power supply: Dedicated power adapter (DC15V, 1A) or 10 pcs 1.5V alkaline batteries (Lr14)
5.1-inch industrial display (320×240 pixels)
Simultaneous display of insulation resistance and leakage current values in the test
PC software for data analysis
Green light indication for POWER button and red light warning for TEST button
Auto discharge function: When insulation resistance like a capacitive load is tested, electric charges
stored in capacitive circuits are automatically discharged after testing. Discharge progress can be displayed.
Backlight Function: To facilitate working at dimly illuminated location or at nighttime
UT516B User Manual UT516B User Manual
1. Overview ------------------------------------------------------------------------------------------------------------------- 4
2. Features -------------------------------------------------------------------------------------------------------------------- 4
3. Accessories ---------------------------------------------------------------------------------------------------------------- 5
4. Safety Instructions ------------------------------------------------------------------------------------------------------- 5
5. Electrical Symbols ------------------------------------------------------------------------------------------------------- 7
6. External Structure -------------------------------------------------------------------------------------------------------- 8
7. Indicators and Buttons -------------------------------------------------------------------------------------------------- 9
8. Operating Instructions ------------------------------------------------------------------------------------------------- 15
9. Specifications ------------------------------------------------------------------------------------------------------------ 31
10. Communication Function (Including Software) ------------------------------------------------------------------ 35
11. Use of Power Adapter -------------------------------------------------------------------------------------------------- 36
12. Test Probe Metal Parts and Replacement ------------------------------------------------------------------------ 37
13. Maintenance ------------------------------------------------------------------------------------------------------------- 38
Table of Contents
5 6
3. Accessories
Open the package box and take out the tester. Please double check whether the following items are missing
or damaged.
a) User manual ------------------------------------------------------ 1 pc
b) Test leads (red, black, green, 1 each) ---------------------- 3 pcs
c) USB cable --------------------------------------------------------- 1 pc
d) Dedicated power adapter -------------------------------------- 1 pc
e) 1.5V alkaline batteries (LR14) -------------------------------- 10 pcs
If any of the above is missing or damaged, please contact your supplier immediately.
4. Safety Instructions
The tester is designed, manufactured and tested according to IEC61010 safety standards (safety requirements
for electronic measuring apparatus). It conforms to double insulation, CAT III 1000V and CAT IV 600V safety
standards. This manual contains warning information and safety regulations. Please read them carefully and
observe them strictly to ensure the safety of the user and tester.
Warning
The UT516B is a 12kV digital high voltage insulation resistance tester. Please read the Safety
Instructions in detail.
The tester outputs high voltage. Please read and understand the Operating Instructions thoroughly before use.
Keep the manual at an easily accessible place to enable quick reference whenever necessary.
Use the tester only as specified.
Please strictly follow all the instructions, or it may cause damage to the tester and user!
Please wear insulated gloves before use.
Do not measure in circuits with voltage above AC 750V or DC 1000V.
Do not test in flammable places. Sparks may cause an explosion.
Never use the tester if its surface or the operator's hands are wet.
Be careful not to short-circuit the metal part with the test leads when testing voltage or it may cause personal
injury.
Do not exceed the maximum allowable range during measurement.
To prevent damage to the tester from high voltage output, do not press the TEST button when the test leads
are connected to the tester.
Never open the battery cover during measurement.
Do not touch the circuit under test when measuring insulation resistance or right after measurement, otherwise
it may pose an electric shock.
Stop the test if contamination or carbonization which may impair insulation characteristics is found on the test
leads or around the terminals.
Avoid short circuit and open circuit of the test leads when measuring insulation resistance. Otherwise, the
measurement may be ceased and the light of the TEST button may go out.
Before use, please check if there is any item which is damaged or behaving abnormally. If any abnormal item
(such as bare test lead, damaged tester housing, broken LCD, etc.) is found, or if the tester is considered to be
malfunctioning, please do not use the tester.
Do not use the tester if the battery cover is not covered up, or it will pose a shock hazard!
When using the tester, keep fingers behind the finger guards on the test leads, and do not touch exposed
wires, connectors or alligator clips to prevent electric shock.
Select correct output voltage before measurement. It is forbidden to change the voltage during measurement
to avoid damage to the tester.
When the “ ” symbol appears on the LCD, please replace the batteries in time to ensure measurement
accuracy. If the tester is not in use for a long time, please remove the batteries. Make sure the tester is turned
off before opening the battery cover.
Do not change the internal circuit of the tester to avoid damage to the tester and user!
Do not use or store the tester in high temperature, high humidity, flammable, explosive or strong magnetic
field environments.
Clean the tester housing with a soft cloth and mild detergent. Do not use abrasives or solvents!
UT516B User Manual UT516B User Manual
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5. Electrical Symbols
Description
Equipment protected throughout by DOUBLE
INSULATION or REINFORCED INSULATION
Earth (ground) Terminal
Warning or Caution
Alternating current
Direct current
Low battery
Caution, possibility of electric shock
Symbol
6. External Structure (Picture 1)
EARTH: Input terminal
for insulation sampling
test lead
GUARD: Input terminal
for grounding guard
test lead
LINE: Input terminal for
high voltage output test
lead
LCD
Buttons on the left
Battery cover
USB port
Power adapter port
Buttons on the right
Placement area for
test leads and power
adapter
Insulation sampling
test lead (black)
Grounding guard test
lead (green)
High voltage output
test lead (red)
Dedicated power adapter
High Voltage (+) GUARD EARTH（-）
INSUL TIMING COMP DCV/
ACV
SET USB
OK
TEST
Press for > 1s
SAVE RECALL CLEAR
CURRENT
CLEAR ALL
NOTE:
Do not measure charged bodies. Disconnect all electrical connections before
measuring.
Turn off tester and remove all test leads before opening battery cover. Make
sure charged bodies are isolated from test leads before taking out batteries.
Contains 10 alkaline batteries (Lr14).
Picture 1
UT516B User Manual UT516B User Manual
9 10
USB
VDC
VAC
＋
－
>,<,=
mA/uA/nA
1
2
3
4
5
6
7
8
9
10
11
7. Indicators and Buttons
7.1 Display Indicators
0 level: Battery voltage <11.0V. Replace the batteries.
1 level: Battery voltage (11.0V~12.0V), for 500V\1000V
\2500V\5000V\10000V test
2 level: Battery voltage (12.1V~13.0V), for 500V\1000V
\2500V\5000V\10000V test
3 level: Battery voltage (13.1V~13.5V), for 500V\1000V
\2500V\5000V\10000V test
4 level: Battery voltage (13.6V~14.0V), for 500V\1000V
\2500V\5000V\10000V\12000V test
5 level: Battery voltage (>14.1V), for 500V\1000V\2500V
\5000V\10000V\12000V test
When the power adapter is used, the battery indicator
is automatically turned off.
Power adapter (15V), for 500V\1000V\2500V\5000V\
10000V\12000V test
Battery level
Power adapter
Caution, possibility
of electric shock
Analog bar
PC communication
DC voltage
AC voltage
DC voltage positive pole
DC voltage negative pole
greater than, less than, equal to
Current units
Only for insulation measurement
Comparative measurement results
High voltage output indicator
Analog bar for insulation resistance
No. Indicator Description Remark
UT516B User Manual UT516B User Manual
11 12
7.2 Buttons (Picture 2, Picture 3)
Switch to insulation measurement. The tester defaults to insulation measurement after
booting. This button also can be used to exit each setting interface.
Short press to turn on/off timing measurement. The tester defaults
to continuous measurement mode after booting.
Short press to turn on/off comparative measurement. The tester defaults
to continuous measurement mode after booting.
Switch to voltage measurement (automatic identification of AC/DC voltage)
Short press the SET button to set system functions (short press the INSUL button to exit
each setting interface):
1. Date/Time
Set or adjust the system clock to match the current time and date.
2. Timing Measurement
Set the insulation measurement countdown time (from 60s). Once the time is up, the
insulation measurement will be stopped automatically.
3. DAR Measurement
Set the DAR measurement Time 1 (range: 15s~299s; 15s by default); set the DAR
measurement Time 2 (range: 60s~599s; 60s by default).
4. PI Measurement
Set the PI measurement Time 1 (range: 1min~29min; 1min by default); set the PI
measurement Time 2 (range: 10min~59min; 10min by default).
5. Factory Reset
Restore all settings data to default values.
When modifying a parameter, move the cursor with the LEFT/RIGHT button, use the
UP/DOWN button to change the current value, select the OK or Cancel option, and
short press the OK button to confirm the modification.
Short press to turn on/off USB transmission function. When the function is on, the
LCD displays the “USB” symbol.
Picture 2
Picture 3
UT516B User Manual UT516B User Manual
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Insulation measurement: Select an output voltage range upwards.
"Settings" function: Upward adjustment button
Power on/off (green light indication for the on state).
Long press (>1s) to start insulation measurement, and short press to stop.
Insulation measurement: Adjust the output voltage range downwards by 10%.
"Settings" function: Leftward adjustment button
Insulation measurement: Adjust the output voltage range upwards by 10%.
"Settings" function: Rightward adjustment button
Insulation measurement: Select an output voltage range downwards.
"Settings" function: Downward adjustment button
Insulation measurement interface: Confirm data clearing.
"Settings" interface: Confirm an option.
When measuring insulation resistance, short press the SAVE button to save the current
measurement data in the tester and “Storage Number 001/999” will be displayed in the
lower left corner of the LCD. The storage number increases progressively from 001 to 999.
After measurement, short press the RECALL button to recall the stored measurement
data and the last saved data will be displayed by default. Short press the UP/DOWN
button to scroll through other data.
Note: The high voltage output test cannot be conducted during data recalling.
Short press the RECALL button to exit the data recalling mode, and then do the test.
Short press the CLEAR CURRENT button in recalling data and “Delete the current data?”
will appear on the LCD. Short press the OK button and the current data will be cleared
immediately.
Long press the CLEAR ALL button for about 5s in recalling data and “Delete all data?”
will appear on the LCD. Short press the OK button and all data stored in the tester will
be cleared.
Note: It may take some time to clear all data if the amount of data deleted is large.
UT516B User Manual UT516B User Manual
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8. Operating Instructions
8.1 Preparation for Measurement
8.1.1 Battery Voltage Check
Press the POWER button to turn on the tester and enter the insulation measurement interface without connecting
the power adapter. When the battery indicator shown at the upper left on the LCD is 0 level (“ ”), it indicates
low battery. See 7.1 Display Indicators for the corresponding battery voltage of each level. When the battery
voltage Is below the lower limit of the operating voltage, the accuracy cannot be guaranteed. No measurement
can be performed even the TEST button is pressed down. Please replace the batteries or insert the power adapter.
8.1.2 Test Lead Connection
1) Insert the red test lead into the LINE terminal, black into the EARTH terminal.
2) Insert the green test lead into the GUARD terminal (leave the GUARD terminal unconnected unless
establishing a guard is necessary).
Note: Do not insert the green or black test lead into the LINE terminal. This cannot enable measurement
and may pose an electric shock.
8.2 Basic Measurement Operation
8.2.1 Starting up
Press the POWER button to turn on the tester and the initialization interface with “UNI-T” logo will be displayed,
as shown in Picture 4.
Picture 4
The tester enters the continuous measurement state of insulation resistance by default, as shown
in Picture 5.
Picture 5
UT516B User Manual UT516B User Manual
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8.2.2 Measurement without Guard Terminal
For most tests, only two test leads are used. Connect the red test probe and black alligator with the measured
object as shown in Picture 6.
8.2.3 Measurement Using Guard Terminal
When measuring the insulation resistance from the conductor to the outer sheath of a cable, there may be a
leakage current for the intermediate layer, causing measurement error. To prevent such error, connect the green
test lead directly to the leakage current winding end (as shown in Picture 7), and the leakage current portion will
not be counted in the displayed value. The reading value is only the insulation 3resistance from the conductor
to the outer sheath of the cable.
Picture 6 Picture 7
Note: Measurement using guard terminal is suitable for testing the entire circuit of a high voltage cable
containing other high voltage equipment. Connect the GUARD terminal to the leakage current electrode of the
measured object, and EARTH terminal to the green test lead. At this time, the leakage current cannot flow into
the EARTH terminal for calculation. However, for this measurement method, the insulation resistance of the
sheath (between the shielded cable and the ground) must be >1MΩ.
UT516B User Manual UT516B User Manual
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