Switching loop resistance tester, also known as RX transformer loop resistance tester, English name: LoopResistanceTester. The detailed introduction of loop resistance tester According to the requirements of the new “Transmission and Preventive Test Regulations for Electrical Equipmentâ€, the measurement of conductive loop resistance of various switchgears shall not be less than 100A. For this purpose, our factory has designed and developed a new generation of intelligent loop resistance tester products according to new regulations. This product is suitable for testing the contact resistance value of main contacts of high and low voltage switches, and the DC resistance value of high and low voltage cable lines.
1. [Phenomenon] The loop resistance tester is connected to the 220V AC power supply, the fan has no running sound, and the “test switch†is clicked. The ammeter and micro-ohmmeter are not displayed.
[Cause] The 220V AC power source is not connected and the fuse is not installed or blown.
[Exclusion method] Check and rule out. (100A instrument insurance is not less than 6A again blown and contacted by the factory to solve. (Do not connect DC or 380V AC power)
2. [Phenomenon] Click "Test Switch", the current meter shows no current, and the highest digit of the micro-meter shows "1".
[Cause] 100A current loop is not connected. The switch was not closed.
[Remedy] Check the test line, reconnect, and re-clamp. Close the switch.
3. [Phenomenon] The test current is normal and the highest bit of the micro-Euro value shows "1"
[Cause] The voltage clamp position is wrong. The resistance of the circuit under test exceeds 2000â–¡â–¡. The voltage signal line is broken or not connected.
[Remedy] Handle the voltage signal loop, clamp and clamp the voltage clip. During over-range: The multimeter can be used to measure the voltage of P1 and P2. The resistance value is the voltage value/current value.
4. [Phenomenon] The output current is several tens of times less than 100A.
[Cause] The power supply voltage is too low, the resistance of the power line is large or the contact is poor, and the voltage drop when there is a DC output 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.
[Exclusion method] Use a qualified power source and use a power cord that is too long or too thin to dispose of the circuit under test to eliminate poor contact. Use appropriate force when twisting the C1, C2, P1, and P2 terminals. (test current lies in 30A test value is trusted)
5. [Phenomenon] The test current is normal, and the micro-ohm value is abnormal and does not repeat.
[Cause] The voltage signal circuit is in poor contact, and it is turned on and off. The measured resistance itself is not in good contact and the resistance value changes.
[Remedy] Ensure good and reliable contact. Check and rule out.
6. [Phenomenon] The test current is normal and the micro-ohmmeter shows a negative value.
[Cause] The voltage clamp is misaligned and reversed.
[Remedy] Corrected, should be: P1+, P2.
7. [Phenomenon] Sometimes the display value fluctuates during the verification test.
[Cause] When the test was performed, the test line was inductive and did not spread.
[Remedy method] Pull open the test line to reduce the inductance of the inductor.
1. [Phenomenon] The loop resistance tester is connected to the 220V AC power supply, the fan has no running sound, and the “test switch†is clicked. The ammeter and micro-ohmmeter are not displayed.
[Cause] The 220V AC power source is not connected and the fuse is not installed or blown.
[Exclusion method] Check and rule out. (100A instrument insurance is not less than 6A again blown and contacted by the factory to solve. (Do not connect DC or 380V AC power)
2. [Phenomenon] Click "Test Switch", the current meter shows no current, and the highest digit of the micro-meter shows "1".
[Cause] 100A current loop is not connected. The switch was not closed.
[Remedy] Check the test line, reconnect, and re-clamp. Close the switch.
3. [Phenomenon] The test current is normal and the highest bit of the micro-Euro value shows "1"
[Cause] The voltage clamp position is wrong. The resistance of the circuit under test exceeds 2000â–¡â–¡. The voltage signal line is broken or not connected.
[Remedy] Handle the voltage signal loop, clamp and clamp the voltage clip. During over-range: The multimeter can be used to measure the voltage of P1 and P2. The resistance value is the voltage value/current value.
4. [Phenomenon] The output current is several tens of times less than 100A.
[Cause] The power supply voltage is too low, the resistance of the power line is large or the contact is poor, and the voltage drop when there is a DC output 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.
[Exclusion method] Use a qualified power source and use a power cord that is too long or too thin to dispose of the circuit under test to eliminate poor contact. Use appropriate force when twisting the C1, C2, P1, and P2 terminals. (test current lies in 30A test value is trusted)
5. [Phenomenon] The test current is normal, and the micro-ohm value is abnormal and does not repeat.
[Cause] The voltage signal circuit is in poor contact, and it is turned on and off. The measured resistance itself is not in good contact and the resistance value changes.
[Remedy] Ensure good and reliable contact. Check and rule out.
6. [Phenomenon] The test current is normal and the micro-ohmmeter shows a negative value.
[Cause] The voltage clamp is misaligned and reversed.
[Remedy] Corrected, should be: P1+, P2.
7. [Phenomenon] Sometimes the display value fluctuates during the verification test.
[Cause] When the test was performed, the test line was inductive and did not spread.
[Remedy method] Pull open the test line to reduce the inductance of the inductor.
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