Common problems in the use of loop resistance tester and troubleshooting methods - Database & Sql Blog Articles

Kaixin micro test

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Test probe PH-5H

The loop resistance tester will inevitably encounter various abnormal problems in our daily use. Let's briefly talk about how to solve these abnormal problems. 1. Phenomenon: The loop resistance tester is connected to 220V AC power supply, and the fan is not running. Sound, and press the "test switch", the ammeter, micro-European table is not displayed.
Cause: The 220V AC power supply is unreachable, and the fuse is not installed or blown.
Remedy: Check and exclude. (100A instrument insurance is not less than 6A, and then disconnected with the factory to solve the problem. (Do not connect DC or 380V AC power)
Second, the phenomenon: press the "test switch" of the loop resistance tester, the ammeter shows no current, the highest position of the micro-euro meter shows "1".
Cause: The 100A current loop is not connected. The test switch was not closed.
Remedy: Check the test line, reconnect, and re-clamp. Close the switch.
Third, the phenomenon: the loop resistance tester test current is normal, the highest value of the micro-ohm value shows "1"
Cause: The voltage clip is in the wrong position. The measured resistance of the loop exceeds 2000 â–¡. The voltage signal line is broken or not turned on.
Remedy: Handle the voltage signal loop, clamp and clamp the voltage clamp. When over-range: The P1 and P2 voltage values ​​can be measured with a multimeter, and the resistance value = voltage value/current value.
Fourth, the phenomenon: the loop resistance tester output current dozens of times, less than 100A.
Cause: The power supply voltage is too low, the internal resistance of the power supply line is large or the contact is poor. When there is a DC output, the voltage drop is too large to reach 190V. The C1 and C2 terminals are loose. The circuit under test and the test clamp are not in good contact.
Remedy: Use a qualified power supply, use a power cord that is too long and too thin, handle the circuit under test, and eliminate poor contact. The force should be appropriate when twisting the C1, C2, P1, and P2 terminals. (Test current is 30A test value is reliable)
In the case of similar problems above, we can all solve this method. The loop resistance tester may be present in these situations. It is hoped that the above explanation will be helpful to everyone.