Hi all,
I bought a Uni-T 204 a couple of weeks ago but it was very disappointing from my point of view.
The theoretical resolution below the 1 Amp range is not really usable due to the high fluctuation around the last (2) digits.
I was not able to measure a DC current around 100mA and sent back the unit ![ThumbsDown :--](https://www.eevblog.com/forum/Smileys/default/icon_thumbsdown.gif.pagespeed.ce.D027Y9gZ7m.gif)
Any recommendation for a decent clamp meter that can measure down to 10mA without having the feeling just to read some random numbers on the display...
Regards Arne
The accuracy on the DC 40A range is 2%+5 with a resolution of 10mA. So, if you're measuring 1A, you can expect fluctuaction of 70mA either side of the real value.
If your conductor is not exactly in the middle of the jaws, you should increase that amount by 1%, giving you a fluctuation of 80mA.
These predictions are derived from tests done in a controlled environment.
As the Hall sensors are sensitive to magnetism, shock, heat and machines nearby, your measuring experiences coud fall outside these figures.
I find that if I respect the published procedure, I usually get readings within these limits.
For instance, measuring 100mA with the clamp, gives me readings fluctuating betweeen 70 and 130 mA.
If you need more accuracy, there are dedicated clamp meters for milliamp measurement, with much narrower jaws and better specs on the market.
Here is one of them (more expensive at 130$ and not true RMS):