The conductivity of the conductive circuit of the circuit breaker (hereinafter referred to as the switch) plays an important role in ensuring the safe operation of the switch. The quality of electrical conductivity can be reflected by the resistance of the conductive loop. Therefore, the IEC standard and the manufacturer stipulate that the loop resistance should be measured, and there are clear indicators for the loop resistance of various forms of switches. In the past, a double-arm bridge was used. Because the voltage and current of the electric bridge are relatively small, when there are impurities or oxidation on the surface between the moving and static contacts of the switch, the dispersion of the test data will be greater. At the same time, the anti-interference of the electric bridge is poor, so the national standard stipulates that the test must be performed with a direct current above 100A. ...

YNHL-200A loop resistance tester is a test instrument developed by our company to meet the requirements of GB50150-2006 and DL/T 845.4-2004. It is widely used for contact resistance, loop resistance of various electrical switches, and contact resistance of cables, wires, and welds. Measurement.

1. The test current is large, which fully meets the requirements of the national standards for testing contact resistance.

2. The test current comes from a high-precision 100A/200A switching constant current power supply, no manual adjustment is required, and the test is rapid and accurate.

3. The four-terminal wiring method is used to effectively eliminate the influence of the test wire resistance on the test results.

4. The test speed is fast.

5. Working for a long time, with overheating protection circuit, the instrument is reliable and stable.

6. Easy to operate and light in weight.

1. Test current:

2. Measuring range:

3. MIN resolution: 0.01μΩ

4. Accuracy: 1%±0.5μΩ

5. Working mode: output time can be set

6. Power supply: AC220V±10% 50Hz

7. Power consumption:

8. Operating temperature: -20℃～40℃

9. Relative humidity: ≤80%RH, no condensation

10. Weight: