Detection Technology
Three common problems of loop resistance tester
Three common problems and solutions for loop resistance testers
1. The loop resistance tester usually tests the current, and the Z value of the micro-ohm value is displayed as "1".
Cause: The voltage clamp is in the wrong position. The measured loop resistance value exceeds 2000. The voltage signal wire is disconnected or not opened.
Treatment: Process the voltage signal circuit, clamp and clamp the voltage clamp. When over-range: Use a multimeter to measure the voltage values of P1 and P2, and the resistance value = voltage value/current value.
2. Press the "test switch" of the loop resistance tester, the ammeter has no current, and the Z height of the miniature ohmmeter displays "1".
Reason: The 100A current loop is not connected. The test switch is not closed.
Treatment: Check the test leads, reconnect, re-clamp, and then close the switch.
3. The loop resistance test is connected to a 220V AC power supply. The fan is not running, then press the "test switch". Ammeters and miniature western instruments are not shown.
Reason: 220V AC power supply is unavailable, and the fuse is not installed or blown.
Treatment: check and exclude. (100A instrument insurance is not less than 6A, then disconnect from the factory to solve the problem. (Do not connect DC or 380V AC power)
General problems of circuit breaker tester | 2021/9/10 | reading693time Use of zinc oxide arrester tester | 2021/9/9 | reading741time return