Products > Test Equipment
Micsig Current Probe CP2100A/B Tests and Comparing
Algasman:
--- Quote from: bicycleguy on October 26, 2020, 11:05:21 pm ---What I was getting at is this thread is about comparing the performance of various probes against each other, including A vs B Micsigs. It doesn't make any sense to compare A with 5 turns vs B with 0. Seems that the best is to compare no turns on every probe.
--- End quote ---
Right, comparison makes only sense if the conditions are equal. That’s what we did.
It is perfectly fine to use only one turn (just the wire) if you have a decent signal. A signal generator producing a current of only 50 mA RMS on a probe in the 10 Amps range did not give me a good enough S/N.
That’s why I multiplied the input signal buy using turns and adjusting the input signal to read the 2.5 volts RMS at the load resistor, compensating for the insertion impedance.
Algasman:
--- Quote from: Weston on October 27, 2020, 01:33:46 am ---The official manual for the CP2100 does not give any noise values. Has anyone measured values for the peak to peak and RMS noise values for the probe?
--- End quote ---
I finally had the chance to measure noise (empty clamp).
With almost 5mA RMS of noise, measuring a 50mA RMS Signal (as in my test case) with just one turn is more guessing than measuring.
Martin72:
I´ve used the averaging function of my scope in that range (or below, 20mA/div), then it works pretty well.
Still my probe is at work and at last, I´ll do some real measurements next week, working on a power inverter.
Last friday done a quick test, using a fluke87V and an bnc adaptor - Under 10A it got a remarkable accuracy in comparison to a ZES LMG670 poweranalyzer.
Will check this further, posting the results here.
Although I´m very confident with it, this one still makes me curious:
https://de.aliexpress.com/item/32827427938.html
Good, it will cost nearly double but still miles away from the stuff of hioki and it´s "brands"....
Algasman:
--- Quote from: Martin72 on November 01, 2020, 09:19:43 pm ---I´ve used the averaging function of my scope in that range (or below, 20mA/div), then it works pretty well.
Still my probe is at work and at last, I´ll do some real measurements next week, working on a power inverter.
Last friday done a quick test, using a fluke87V and an bnc adaptor - Under 10A it got a remarkable accuracy in comparison to a ZES LMG670 poweranalyzer.
Will check this further, posting the results here.
Although I´m very confident with it, this one still makes me curious:
https://de.aliexpress.com/item/32827427938.html
Good, it will cost nearly double but still miles away from the stuff of hioki and it´s "brands"....
--- End quote ---
Looks nice, but if the stated sensitivity is true, then you get only 20mV at full scale with ~1mV RMS noise on top. I hope that’s not true.
But anyway, the CP2100A is good value vor money.
What makes me curious is that this that this probe and all the fancy ones have a degaussing function whereas our Micsig and the other economy probes have not.
If it is so important to get rid of the residual magnetization shouldn’t the economy probes also be degaussed from time to time.
If yes, how?
Martin72:
Hi,
--- Quote ---What makes me curious is that this that this probe and all the fancy ones have a degaussing function whereas our Micsig and the other economy probes have not.
--- End quote ---
I think it´s because of the (DC- current)measuring method, the ICP and also Tek/Hioki got the degaussing function on board.
The current compensating method "eliminates" the magnetic field caused by the current flow by using a compansation winding on the core, so they can also use these windings to demagnetize the coil.
--- Quote ---If it is so important to get rid of the residual magnetization shouldn’t the economy probes also be degaussed from time to time.
If yes, how?
--- End quote ---
See the uni-t ut210e clampmeter thread, there are several possibilities described or look for a watch-demagnetizer in ebay or amazon ( should also work).
This is an still open question in this thread I try to answer it in the next days, by testing the micsig with maximum dc current, if the core gets magnetized after this, you´ll get a "huge" offset until it will be demagnetized.
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