If using a clamp ammeter correctly to measure load current
Clamp ammeters are divided into high voltage and low voltage, and cannot be used incorrectly.
1. Choose the appropriate gear. The principle of gear selection is:
(1) When the range of the measured current is known: choose the gear that is greater than the measured value but closest to it.
(2) When the range of the measured current is unknown: it can be tested at the highest current level first.
2. The tester should wear gloves, flatten the meter, open the jaws, and allow the tested wire to enter the jaws before closing the jaws. The tested wire should be located in the center of the space inside the jaws.
3. Correct reading: Take a reading on the corresponding scale line based on the gear used.
4. When measuring a small current, if the deviation angle of the meter needle is still very small when measured at the lowest gear (the deviation angle of the meter needle is small, which means that the relative error of the measurement is large), and the full scale value of the lowest range gear of the instrument is less than 10%, it is allowed to wrap the wire several turns on the clamp, close the clamp, and take the reading. At this point:
The current value on the wire=reading/number of turns (calculation of turns: there are several wires inside the clamp, even if a few turns are made).
5. After measuring the high current, the jaws should be opened and closed several times for demagnetization before measuring the low current;
Finally, a reminder: Do not use a clamp ammeter to measure direct current!
How to use a clamp ammeter? Before measuring the current with a clamp ammeter, make sure to remove the test wire from the instrument. That's all for now! Thank you for reading! I hope it can be helpful to everyone!
