Purpose 1: Measure three-phase three-wire circuit current and three-phase four-wire neutral current
The clamp meter generally measures the current of a single wire. If two wires are clamped at the same time when measuring the current of a three-phase three-wire load, the indicated current value should be the current of the third wire.
The method of measuring three-phase four-wire neutral current is the same as measuring the current of three-phase three-wire circuit, and three phase wires are clamped at the same time, and the current value indicated at this time is the neutral current value.
Use 2: Clamp meter to measure small current
Clamp meters measure small currents, and even if the gear is adjusted to the smallest gear, the readings are still not very accurate. Therefore, the wire can be wrapped around the clamp arm and the current value can be read. Then divide the current reading by the number of turns, which is the actual small current value.
Purpose 3: Determine the name of the current in the line
To judge whether the equipment is running normally, it needs to be determined based on the current measured on site, so it is an important thing to determine what the current is.
Use 4: Measure the no-load current of the motor without a nameplate to determine the rated power
Use 5: Measure the no-load current of the 380V electric welding machine without a nameplate to determine the apparent power S
