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 zero line current is the same as measuring three-phase three-wire circuit current, and clamps three phase lines at the same time, and the indicated current value at this time is the zero line current value.
Use 2: Clamp meter to measure small current
The clamp meter measures small currents. Even if the gear is adjusted to the minimum gear, the reading is 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 according to the current measured on the spot, 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 judge the rated power
Estimation formula: divide the no-load current by 0.8, and find the power close to the level.
The steps are as follows: Measure the no-load current value I of the motor, according to the empirical formula: p=I/0.8
Use 5: Measure the no-load current of the 380V electric welding machine without a nameplate to judge the apparent power S
Estimation formula: The capacity of 380 welding machines is equal to the no-load current I multiplied by 5.
The steps are as follows: Measure the no-load current value I of the welding machine, according to the empirical formula: p=5I
