Detection method of digital multimeter measuring live wire
How to measure the live wire with a digital multimeter, the method of measuring the voltage of two wires to ground with the multimeter AC voltage file, using the multimeter <voltage file> to take 220V single-phase electricity as an example, the multimeter <resistance file> to measure the ground resistance of B and C, such as The resistance of B is greater than the resistance of C.
Detection method of digital multimeter measuring live wire
Use the AC voltage range of the multimeter to measure the voltage of the two wires to the ground: the voltage of the live wire to the ground will be close to the phase voltage of 220v, and the voltage of the neutral wire to the ground will be close to zero.
Detection method:
In the case of voltage, use the multimeter <voltage range> to take 220V single-phase electricity as an example, assuming that the fire is A, zero is B, and ground is C. First measure the voltage of A and B, and then measure the voltage of A and C. Then measure the voltage of B and C.
Such as A and B and A and C have voltage. If the voltage between A and B is slightly greater than the voltage between A and C, there is no voltage between B and C.
Then use the multimeter <resistance gear> to measure the ground resistance of B and C, for example, the resistance of B is greater than that of C. It proves that fire is A. Zero is B. Earth is C.
