Common Loop Resistance Tester Faults

Loop Resistance Tester is also called RX Transformer Loop Resistance Tester, English name: Loop Resistance Tester. The common faults are as follows:

1. Phenomenon: the loop resistance tester is connected to the 220V AC power supply, the fan does not make any operating sound, and the \"test switch\" is pressed, the ammeter and the micro- ohmmeter have no display.

Reason: The 220 VAC supply is blocked and the fuse is not installed or has blown.

Exclusion method: check and exclude. (The 100A instrument fuse is not less than 6A, then contact the factory to solve it. (Never connect to DC or 380V AC power)

2. Phenomenon: Press on the \"test switch\", the ammeter shows no current, the micro-ohmmeter shows \"1\".

Reason: The 100A current circuit is not connected correctly. The switch under test is not closed.

Remedy: Check the test line, reconnect, reconnect Close the switch.

3. Phenomenon: The test current is normal, and the micro-ohm value indicates \" 1\"

Reason: The tension clamp position is incorrect. The resistance value of the circuit under test exceeds 2000 □□. The voltage signal line is disconnected or not connected.

Remedy: Deal with the voltage signal circuit, tighten and tighten the voltage clamp securely. When the range is exceeded: Use a multimeter to measure the voltage value of P1 and P2, the resistance value = voltage value / current value.

4. Phenomenon: The output current is tens of times less than 100 A.

Reason: The power supply voltage is too low, the internal resistance of the power supply line is large, or the contact is bad, the voltage drop is too large when there is DC output and it cannot reach 190V. Terminals C1 and C2are loose. The circuit under test and the test wire clamp are not in good contact.

Remedy: use a qualified power supply, it is too helpful If the power cord is too thin, manipulate the circuit under test and eliminate bad contacts. When twisting terminals C1, C2, P1 and P2, use private force. (The test current is 30A and the test value is credible)

5. Phenomenon: The test current is normal and the micro-ohm value display is abnormal and does not repeat not.

Reason: The voltage signal circuit is in poor contact, sometimes on and off. The measured resistance itself is not in good contact and the resistance value changes.

Troubleshooting method: Make sure the contact is good and reliable. Check and eliminate.

6. Phenomenon: The test current is normal, and the micro-ohmmeter displays a negative value.

Reason: The voltage clamp is incorrectly placed, the positive and negativef are reversed.

Remedy: Correct, it should be: P1+, P2.

7. Phenomenon: During the calibration test, sometimes the displayed value fluctuates greatly.

Reason: The test line is shaped like an inductor and was not scattered during the calibration test.

Remedy: Separate the test line to reduce its inductance mutual inductance

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