How to Measure Load Current with a Clamp Ammeter Correctly
Clamp ammeters are divided into high voltage and low voltage, which cannot be used wrongly.
1. Select the appropriate gear. The principles of file selection are:
(1) When the measured current range is known: select the gear that is larger than the measured value but closest to it.
(2) If you don’t know the range of the current to be tested: you can first set the current to the highest level for testing.
2. The tester should wear gloves, put the meter on the flat end, open the jaws, let the wire under test enter the jaws and then close the jaws. The wire under test should be located in the center of the space inside the jaws.
3. Correct reading: According to the gear used, read the reading on the corresponding scale line.
4. When measuring small current, if you measure at the lowest gear, the deflection angle of the needle is still very small (the deflection angle of the needle is small, which means that the relative error of its measurement is large), and the lowest range gear of the meter is below 10% of the full scale value , allowing the wire to be wound around the jaws for a few turns, and after the jaws are closed, read the reading. At this time:
The current value on the wire = reading / number of turns (calculation of the number of turns: how many wires are inside the jaw, count as how many turns).
5. After measuring a large current, before measuring a small current, the jaws should be opened and closed several times for demagnetization;
Final reminder: Do not use a clamp ammeter to measure DC!
