First, the loop resistance tester makes a sound that the fan does not run after the power is turned on, and the device does not respond when the measurement button is pressed. In this case, it is necessary to consider whether the fuse is not installed or the electric fuse is broken. If the circuit Wear and tear may also be caused by poor electrical contact.
Second, although the model of the loop resistance tester is different, and the measurement objects are also different, when the power is turned on and the measurement key is pressed, the ammeter does not display reading, but when the micro-resistance meter shows a reading of 1, it is necessary to check the current Whether the loop is normal, and it is usually a 100A current loop.
Third, just now, after the loop resistance tester is powered on, the ammeter does not display the reading, but the micro-ohmmeter shows 1. When the ammeter is working normally, but the micro-ohmmeter shows 1, it is necessary to check whether the voltage clamp is in the position. error, or because the resistance value of the circuit under test exceeds 2000 mA. At this time, you can troubleshoot the fault by processing the voltage signal loop and re-clamping the voltage clamp.
Fourth, when using the loop resistance tester, there is another situation that the output current of the loop resistance tester is dozens of times but less than 100A. This situation may be caused by the low power supply voltage or poor line contact, which should be one by one. Troubleshoot wiring problems.