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Micsig Current Probe CP2100A/B Tests and Comparing

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2N3055:

--- Quote from: Noy on October 26, 2020, 02:23:32 pm ---So asked the Ali sellers (found 2 with below 140€) some questions and it looks like "better don't touch!"
1. Thing the devices are without official case.
2. I asked them if these parts are genuine and no production "garbage".  If they met the official specification...

Both seller replied in a "talk around the corner" style :-D Don't know the exact english synonym for this speaking style..

The first replied nothing uptil now, only that it is without the case.
The second one replied "I can confirm the item will be the same as you can see on ads".

So both didn't say anything about genuine or specification... Maybe they didn't know... Or they knew and will not reply in an useable way (because they knew... ;-))

But without case / maybe without calibration sheet the devices are likely "production garbage / fake ones"...

I will order from Batronix i think. 5% off is possible if you ask for it....

--- End quote ---

Good decision...

Algasman:

--- Quote from: Noy on October 26, 2020, 02:23:32 pm ---So asked the Ali sellers (found 2 with below 140€) some questions and it looks like "better don't touch!"
1. Thing the devices are without official case.
2. I asked them if these parts are genuine and no production "garbage".  If they met the official specification...

Both seller replied in a "talk around the corner" style :-D Don't know the exact english synonym for this speaking style..

The first replied nothing uptil now, only that it is without the case.
The second one replied "I can confirm the item will be the same as you can see on ads".

So both didn't say anything about genuine or specification... Maybe they didn't know... Or they knew and will not reply in an useable way (because they knew... ;-))

But without case / maybe without calibration sheet the devices are likely "production garbage / fake ones"...

I will order from Batronix i think. 5% off is possible if you ask for it....

--- End quote ---

I got mine from Batronix but without the 5% you get for some other equipment. But they ship very fast.

Algasman:
As for my load, I did the following measurements using a LCR Meter @ 100kHz.

As a Resistor 50.12 Ohms, Theta 1.9 degrees

The series inductance 2,58uH with the clamp attached (5 turn coil with core)

and the series inductance 0.99uH without the clamp (5 turn air coil)
Regarding bicyleguys question

--- Quote ---But how many turns? Where would you stop.

--- End quote ---
It depends on the device under test, putting the clamp around a conductor influences the DUT more or less. It’s the transformer rules you have to take into account. One can do as many turns needed as to get a good S/N ratio as long as the influence to the DUT is acceptable.

Pretty much as if a shunt resistor is inserted to use the voltage drop to measure the current. This burden voltage also influences the DUT. The reason why Dave designed the uCurrent Gold to keep this influence as small as possible.

bicycleguy:

--- Quote from: Algasman on October 26, 2020, 09:31:30 pm ---...
Regarding bicyleguys question

--- Quote ---But how many turns? Where would you stop.

--- End quote ---
It depends on the device under test, putting the clamp around a conductor influences the DUT more or less. It’s the transformer rules you have to take into account. One can do as many turns needed as to get a good S/N ratio as long as the influence to the DUT is acceptable.

Pretty much as if a shunt resistor is inserted to use the voltage drop to measure the current. This burden voltage also influences the DUT. The reason why Dave designed the uCurrent Gold to keep this influence as small as possible.

--- End quote ---

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.

Weston:
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?

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