Contact Resistance Tester
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The intelligent loop (contact) resistance tester, (contact resistance tester) is designed according to the new electric power execution standard DL/T845.4-2004,combining high-frequency switching power supply technology and digital circuit technology. It is suitable for measuring the loop resistance of switch control equipment. The test current adopts the DC 100A and 200A recommended by national standards. The loop resistance can be measured directly at a current of 100A, or directly at a current of 200A, and the final test results are displayed digitally. This instrument has accurate measurement, stable performance, and meets the requirements of on-site high-voltage switch maintenance in power and power supply departments, as well as loop resistance testing in high-voltage switch factories.
Features
1. 320×240 LCD display, high-speed thermal printer.
2. This instrument has the characteristics of small size, light weight, strong anti-interference ability, high precision, convenient operation, and complete protection functions.
3. Using the latest power supply technology, it can continuously output large current for a long time, and flexibly select four current gears: 50A, 100A, 150A, and 200A.
4. Using precision instrumentation operational amplifiers and high-precision quadruple integration A/D converters, combined with a high-performance 16-bit microcontroller, the system automatically switches the amplification factor according to the signal size during measurement, ensuring the test accuracy of this product.
5. This product also designs a real-time calendar clock, providing time basis for printing and saving data.
6. Data storage and historical data browsing functions, can store 200 sets of data, and has power-off protection function.
7. Ultra-wide range, the maximum measurement range reaches 0-4mΩ.
8. Human-machine dialogue full keyboard operation mode, intelligent working process.
Technical Parameters
1. Measurement range: 0~4mΩ (50A gear) 0~2mΩ (100A gear) 0~1.33mΩ (150A gear) 0~1mΩ (200A gear)
2. Test current: DC50A, 100A, 150A, 200A fixed output
3. Measurement accuracy: ±(0.5% rd+2d)
4. Continuous working time: 5s~599s
5. Display mode: large screen Chinese LCD display
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
