Switch circuit resistance measuring instrument

Switch circuit resistance measuring instrument

Introduction

The conductivity performance of the conductive circuit of a circuit breaker (hereinafter referred to as a switch) plays an important role in ensuring the safe operation of the switch. The quality of conductivity can be reflected by the resistance of the conductive circuit. Therefore, both IEC standards and manufacturers require the measurement of circuit resistance, and there are clear specifications for the circuit resistance of various forms of switches. Usually, a double arm bridge was used in the past. Due to the relatively small voltage and current of the bridge, when there are impurities or surface oxidation between the moving and stationary contacts of the switch, the data dispersion of the test is relatively large. At the same time, the anti-interference ability of the bridge is poor. Therefore, both GB50150-91 and DL/T596-1996 stipulate the use of direct current pressure method and a current of not less than 100 amperes. This instrument is designed by our company to meet regulatory requirements and is widely used for measuring the contact resistance, circuit resistance, and contact resistance of various electrical switches, cables, wires, and welds.

Switch circuit resistance measuring instrument

function

1. High current: Using switch power supply technology, it can continuously output high current for a long time, overcoming the drawbacks of instantaneous current in pulse power supplies. It can effectively penetrate the oxide film of switch contacts and obtain good test results

2. High stability: Under severe interference conditions, the last digit of the LCD screen can remain stable within ± 1 word range, with stable readings and good repeatability

3. High precision: Adopting dual channel high-speed 16 bit ∑ - Δ AD sampling and digital signal processing technology, with a resolution of 0.01 μ Ω, it is currently the most stable contact resistance tester in China that can achieve a resolution of 0.01 μ Ω. Its performance exceeds that of imported high current micro ohmmeters

4. Intelligence: Imported high-performance CPU, the system automatically switches the range according to the signal size during measurement to ensure testing accuracy. The over temperature protection circuit can automatically stop outputting current when the tester exceeds the set temperature, ensuring the safe use of the tester

5. High quality: All key components are imported, and the cleverly designed temperature compensation circuit effectively eliminates the influence of environmental temperature on measurement results. The use of Jun connectors enhances the anti vibration performance

6. Powerful function: The current flow can be freely selected between 50A and 100A, and can be set freely within the testing time of 5s~599s, overcoming the shortcomings of other similar testers that cannot set the measurement time or have too short continuous working time, far exceeding the performance of other similar testers

7. Human computer interface friendly: Rotate the mouse to input data conveniently and quickly, set the date and time of the tester independently, save measurement data in real time, and print measurement results in real time

8. USB Transfer: Transfer measurement data to a USB drive through a USB interface, and further analyze and process the measurement data in conjunction with the upper computer software

9. Lightweight in size: easy to use: small in size, light in weight, and convenient to carry

Technical Specifications

1. Test current: 50A, 100A, 200A

2. Range: 50A range from 0 to 100 m Ω

100A档 0～ 50 mΩ

200A档 0～ 20 mΩ

3. Minimum resolution: 0.01 μ Ω

4. Accuracy: 0.5% ± 0.2 Ω

5. Output voltage: DC10V

6. Working mode: 100A, 50A continuous, 200A one minute

7. Power supply: AC220V ± 10% 50Hz

8. Power consumption: ≤ 2000W

9. Operating temperature: -20 ℃ to 40 ℃

10. Relative humidity: ≤ 80%, no condensation

11. Weight: 8.5kg

12. Volume: 360mm × 235mm × 270mm