Electronics > Beginners
Measure contactless dc current 0-100mA
Vindhyachal.takniki:
Is there any sensor available to measure dc current from 0-100mA contactless?
Contactless is the problem, looked for some sensor half effect but they are for very high currents only
Vovk_Z:
As I know there are only teoretical posibilities except Hall sensors. May be there are low-current Hall sensors?
For example, I have Unit UT210e clamp multimeter with 2 A DC current range and 1 mA resolution.
Kleinstein:
Measuring small DC currents via the magnetic field is difficult, as it is hard, as there are background fields. It can work reasonably if the wire goes through a closed core. Besides the hall effect sensors there are also flux gate type sensors, that can be more accurate, but are also more expensive.
Brumby:
--- Quote from: Vovk_Z on February 01, 2020, 09:04:53 am ---As I know there are only teoretical posibilities except Hall sensors. May be there are low-current Hall sensors?
For example, I have Unit UT210e clamp multimeter with 2 A DC current range and 1 mA resolution.
--- End quote ---
I also have the UT210e - and it is a capable meter. The only challenge when measuring DC current is exactly this:
--- Quote from: Kleinstein on February 01, 2020, 09:20:27 am ---Measuring small DC currents via the magnetic field is difficult, as it is hard, as there are background fields.
--- End quote ---
For the UT210e this can be mitigated by keeping the meter as still as possible around the conductor and use the zeroing function until you get a stable (as can be) zero(ish) reading before turning the current on.
From my experience, accuracy (for non contact DC current) is not lab quality, but plenty good enough for the load measurements, resistor calculations, etc. you will encounter on the average work bench.
BravoV:
Even you have the exact probe you want, in order to get an accurate result at that level mA DC contactless-ly, the probing setup, the jig and the surrounding probing area will posed a challenge, as even a big metal object like a steel drawer nearby can affect the measurement.
Oh, the earth's magnet also will affect the probe too :-[, even after null-ing, you can't change the probe's orientation or sometimes even move around, or your probe will turn into sort of unwanted and annoying expensive compass. :-DD
Navigation
[0] Message Index
[#] Next page
Go to full version