UNI-T UT620C Digital Micro Ohm Meter Instruction Manual
- June 3, 2024
- UNI-T
Table of Contents
UNI-T UT620C Digital Micro Ohm Meter Instruction
Safety Information
Thank you for purchasing the product, for better use, please read the user manual carefully and follow the safety information below
- Pay special attention to safety when using the product.
- Do not measure any live object. Make sure that the resistor or metal object to be measured is de-energized before measurement, otherwise, it may damage the product.
- When low battery symbol appears, please charge the product in time (the charging time is 5~8 hours).
- Please charge the battery once a month or two months if the product is not used for a long time.
- Please stop use immediately in case test lead is broken during use.
- Do not place or store the product in environments with high temperature, high humidity, dews, and direct sunlight for a long time.
- Perform regular maintenance, keep product and test leads clean. Avoid drop or impact.
- Use, dismantling or repair shall be performed by authorized professional.
- If danger caused by the product occurs, please stop use and seal the product immediately, and send it to authorized center for maintenance.
- The symbol “ ” affixed at product and shown in user manual indicates user must operate according to the instruction.
Overview
Digital Micro Ohm Meter (also known as Micro Ohm Meter, Ohm Meter, and DC Resistance Tester) adopts micro-processor technology and 4-wire testing method to make measurement safe, accurate and reliable. The meter is mainly applied to measure resistance of conductor, contact resistance of switch, connector and relay, resistance and contact resistance of coil, motor and transformer winding. It can also test connection resistance and low resistance between metal parts, resistance and contact resistance of connecting conductors between grounding electrode of ground grid. The product consists of meter, monitoring software, test leads, communication cable, etc. Featuring a large LCD, the tester enables user to view the data easily. It can store 500 groups of data. The measured resistance ranges ftware of master computer has multiple functions including data viewing, data accessing, data storage, report generation, etc.
Range and Accuracy
Model| Range| Accuracy| Resolution| Max.
Testing Current
---|---|---|---|---
UT620C
| ****| ±0.1%FS±20dgt (18°C~28°C;
<70%rh)
| | 1.2A
| | 1.2A
| | 1.2A
| | 1.2A
| | 0.5A
| | 0.05A
| | 5mA
~100.00| | 0.5mA
| | 0.05mA
Note: ±0.2%FS±20dgt (18°C~28°C; >70%rh / -10°C~50°C; <80%rh)
Technical Specifications
Function
| The meter is mainly applied to measure resistance of conductor, contact resistance of switch, connector and relay, resistance and contact resistance of coil, motor and transformer winding. It can also test connection resistance and low resistance between metal parts, resistance and
contact resistance of connecting conductors between grounding electrode of ground grid.
---|---
Testing method| 4-wire method
Testing current| 1A
Open-circuit
voltage
| 4.2V
Power| 8W
Power supply| DC 3.7V 2000mAh lithium battery
Backlight| Controllable backlight on off-white screen (applicable to use
in dark environments)
Display mode| LCD display; backlight on off-white screen
LCD size| 71mm52mm (LW)
Product
dimensions
| 187mm191mm51mm (LWH)
Length of test
lead
| About 70cm (red test lead: 1pc; black test lead: 1pc)
Measurement time| About 2 times per second
USB port| Micro USB port
Communication
cable
| Micro USB cable (1pc)
---|---
Data storage| Store 500 groups of data. “MEM” to indicate storage; “FULL”
to indicate full storage.
Data viewing| Symbol “MR” appears
Overrange indication| Symbol “OL” appears
Battery voltage| Battery voltage is displayed in real time. Please charge the
battery in time if the meter indicates low battery.
Auto power off| “APO” to indicate auto power off. The meter powers off
automatically after 15 minutes of inactivity.
Power consumption| Standby: About 100mA (with backlight off)
Backlight: About 105mA
Measuring: 2A Max.
Weight| Meter: 480g (including battery)
Test leads: 250g
Operating temperature and
humidity
| -10°C~50°C; <70%rh
Storage
temperature and humidity
| -20°C~60°C; <70%rh
Overload protection| AC 220V/0.0001s (C1-C2, P1-P2). After performing overload
protection, please restart the meter for normal
testing.
Insulation
resistance
| ****
Withstand
voltage
| AC 3700V/rms (between circuit and casing)
Electromagnetic characteristic| IEC61010-4-3. Electromagnetic field of radio
frequency is 1V/m
Applicable regulation| IEC61010-1, CAT III 600V, Pollution Class 2,
JJG724-1991
“ Verification Regulation of DC Digital Ohmmeter ”, JJG166- 1993 “ Verification Regulation of DC Resistors ”, “DL/T967- 2005 Verification Regulation of Loop Resistance Tester and DC Resistance High-Speed Tester ”
External Structure
- USB transmission/charging port
- Charging indicator light
- Connectors for test leads
- LCD display
- Rubber insulation protector
- Functional buttons
- Test leads (red: 1pc; black: 1pc)
Operating Instructions
Power on/off
Press to power on/off the meter. “ ” appears on the bottom right corner of the LCD after the meter powers on. The meter powers off automatically after 15 minutes of inactivity.
Check battery voltage
If low battery symbol appears on the LCD after the meter turns on for 2 to 4 seconds, it indicates the battery voltage is low, in such case, please charge the battery in time. Sufficient battery voltage ensures measurement accuracy. The battery indication bars decrease as the battery voltage decreases
Resistance precision testing
| Please clear the insulation layer and the oxidation layer on the
---|---
surface of the object to be measured before test.
Do not perform live test for resistance or DC low resistance. Live
test may damage the meter.
Test clips may be oxidized after they are used for a long time. To
ensure good contact of clips, please clear the oxide and the foreign
object at the clips.
Make sure the connection between test leads and tester/measured
object are reliable.
Component heat during test may cause error, thus it is
recommended to perform test for 30 seconds, with testing interval
at 30 seconds.
If the symbol “OL” appears during test, it indicates the resistance
between measured points exceeds the range. Please restart the
meter and then retest to troubleshoot fault caused by overload
protection, if the fault is caused by overload protection, it indicates
the measured resistor is energized, please de-energized the
measured resistor immediately and restart the meter for retesting.
Or please check if poor contact of test leads occurs (the circuit
between measured points may be open).
Measure resistance by connecting the meter with the resistor
Measure the resistance between electric meter and down conductor
Measure the resistance between metal connectors
Measure the resistance of contact points of relay
Backlight control
In power-on state, press to turn on/off backlight. The backlight function applies in dark environments. The default state of backlight is off when powering on the meter.
Data hold/storage
After the meter is powered on or measurement is completed, press to hold the current displayed data, press to perform numbering automatically and store current displayed data. The symbol appears on the LCD if storage is pressed
Data viewing/deletion
After the meter is powered on or measurement is completed, the meter switches to data viewing mode and appears on the LCD when is pressed. Press “◀” or “▶” to set the step as 1 (group), press or to set the step as 10 (groups). Press or press for twice to exit the mode and return to testing mode. As show below, the number “1” at top right is the number of group. If no data is stored, appears on the LCD.
In data viewing mode, press to switch to data deletion mode. Press or to select or . When pressing and then pressing , the data will not be deleted and the meter returns to testing state. Press and then press to delete all stored data. After deletion, the display is showed as below
Data upload
Connect the meter with computer via USB cable, turn on the meter, then operate the software of master computer. If USB connection is successful, the stored data can be viewed, uploaded and saved. The software of master computer has multiple functions including data viewing, data accessing, data storage, etc.
Line resistance calibration (clear residual resistance)
Short-circuit both clips first, then long press for 2 to 3 seconds after the displayed value is stabilized, to complete calibrating line resistance, as shown below:
Note: Only when the displayed value is stabilized can be pressed
Battery Description
| The charging time is 5~8 hours typically.
---|---
Please charge the battery once a month or two months if the
product is not used for a long time.
Charge the battery with the equipped original charger. The product does not
support fast charging.
The charger lights up red when charged and lights up green after
charged fully.
The product is powered by 3.7V lithium battery. If the battery voltage decreases, the battery indication bars will decrease and the symbol will appears on the LCD, in such situation, please charge the battery in time. Low battery voltage can affect measurement accuracy.
Packing List
| Meter | 1 pc |
|---|---|
| Carrying bag | 1 pc |
| USB cable (data transmission) | 1 pc |
| Test lead | 2 pcs (red: 1pc; black: 1pc) |
| Power Charger | 1 pcs |
| User manual | 1 pcs |
Note
The content of this user manual cannot be used as a reason for using the product for special purposes. The company is not responsible for other losses caused by use. The company reserves the right to modify the contents of the user manual. If there are changes, no further notice will be given.
No.6, Gong Ye Bei 1st Road, Songshan Lake National High-Tech Industrial Development Zone, Dongguan City Guangdong Province, China Made in China
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