UNI-T UT625A Low Resistance Ohmmeter (0.1μΩ ~ 1000mΩ)

 Current  (customizable)/  Range/ Resolution/ Accuracy

200A /- /- / 

100A/  0.1uΩ~1999.9uΩ/  0.1uΩ/ ±(0.4%rdg+0.04%FS)

100A/ 2.000mΩ~9.999mΩ/ 0.001mΩ/ ±(0.4%rdg+0.04%FS)

50A/ 10.00mΩ~99.99mΩ/ 0.01mΩ/ ±(0.4%rdg+0.04%FS)  

5A/ 100.0mΩ~499.9mΩ/ 0.1mΩ/ ±(0.4%rdg+0.6%FS)

5A/ 500mΩ~1000mΩ/ 0.1mΩ/ ±(0.4%rdg+0.6%FS)

Functions

To test the contact resistance of low/medium/high-voltage circuit breakers;

To test bus connections and other high-current connection points.

Resistance measurement: 0.1uΩ~1000mΩ: 0.1uΩ

Test method:
Four-wire Kelvin test;

Separation of current and voltage electrodes eliminates internal wiring impedance and contact resistance for more accurate measurements;

Minimizes measurement errors to achieve high-precision results when measuring low-resistance components.

Noise suppression: At 100 mV differential pressure, the noise frequency of the test lead is 50-60 Hz.

Stepping test current:

5A~ 100A DC

Stepping current:5A or 10A 

Test time: 10S、20S、30S、60S, stepping time: 1s.

Test duration: The maximum continuous testing time for a single run is 60 seconds.  

Resistance value comparison:

Pre-set value: 0.000~9999.9mΩ;

Compare measured and set resistance values, automatically display “PASS” or “FAIL”

Over range indication:
Low Limit Alert: When the loop resistance measurement is low limit, the measurement interface will display “LO”;

Over-limit indication: when the loop resistance measurement exceeds the limit, the measurement interface will display “OL”;

Self-inspection:
Yes, Self-calibration via standard accessory “shunt” to verify measurement accuracy and ensure reliable data.

UT625A: 750μΩ; UT625B: 375μΩ

Open circuit voltage: voltage: 5V DC

Overheating protection: ✔

Output power: Measurement power ≤ 250W

Display: 7 inch color LCD

Printer: Built-in thermal printer

Input power supply: AC 198V~242V（50/60Hz）

Data Communication:
Supports PC connection (via USB cable).

Real-time analysis

Historical data review

Excel report generation

Data storage: 200 sets; auto/manual save, Circular save

Backlight: 5 levels adjustable backlight

Low battery indication: ✔

Working environment:  -20°C~+50°C ; <85% R.H., no condensation

Storage environment:  -30°C~+60°C ; <85% R.H., no condensation

 Datasheet