1. Loop resistance tester is also called contact resistance tester or switch loop resistance tester. It is mainly used to detect the contact (loop) resistance of high-voltage switches. It can also be used to detect high-precision measurement of the DC resistance of cable lines, and Need to measure the large current and micro-resistance. Take the high-voltage switch as an example. In popular words, the loop resistance tester is used to detect the closing condition of the high-voltage switch. The performance of the high-voltage switch is also related to the normal operation of the entire power system. Therefore, the detection of the loop resistance of the high-voltage switch in the power work is also a very important test task.

2. There are manual test instruments and automatic test instruments in the loop resistance tester. Take SX-100A loop resistance tester as an example, it is an intelligent automatic loop resistance tester. The automatic measurement of the instrument is presented. When testing, there is no need to manually adjust the current. The instrument itself can adjust the test current to stabilize the current at the current that needs to be measured.

3. The instrument adopts switching power supply technology, which can continuously output large current for a long time, overcomes the shortcomings of pulsed power supply's instantaneous current, can effectively break down the oxide film of the switch contact, and obtain good test results.

4. In addition to the above advantages, the loop resistance tester also has storage and printing functions, which can transmit test data and print test data on-site, and the test performance of the instrument is very stable, and the test accuracy is also high.