If the clamp meter (multimeter) does not measure but there are still numbers, is it a malfunction?

Ablikim

If the clamp meter (multimeter) does not measure but there are still numbers, is it a malfunction? [Copy link]

I would like to ask if the clamp meter (multimeter) is faulty if there are still numbers when it is not measuring? It keeps jumping back and forth, sometimes large and sometimes small.

maychang

From the photo, it looks like it is set to 200A.

If the clamp meter is not placed in a strong external magnetic field, the reading of this range should be close to zero.

chunyang

It may be that the contact is poor, try rotating it repeatedly. My old digital multimeter has not been used for a long time, and the contact is oxidized and in poor contact, resulting in random value jumps after turning it on. Slight oxidation can be improved by repeatedly rotating the gear dial and scraping off the oxide layer, but heavy oxidation requires disassembly, and if it is too serious, it can only be scrapped.

btty038

Judging from the appearance, it has been in service for quite a while. The surface is smooth and old. Just replace it. It will affect the accuracy of the test and measurement. Anyway, it is not very expensive.

Ablikim

chunyang posted on 2019-10-19 15:32 It may be that the contact is poor, try rotating it repeatedly. My old digital multimeter has not been used for a long time, and the contact is oxidized and in poor contact. As a result, the value jumps randomly after turning on the machine...

Got it, thank you, Master.

Ablikim

btty038 posted on 2019-10-19 16:22 From the appearance, it has been in service for a long time. The surface is smooth and old. Just replace it. It will affect the accuracy of the test and measurement. Anyway, it is not very expensive

Got it, thank you, Master.

Ablikim

maychang posted on 2019-10-19 14:46 From the photo, it seems to be set to 200A. If the clamp meter is not placed in a place with a strong external magnetic field, the reading at this level should be close to zero.

Got it, thank you, Master.