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Micsig Current Probe CP2100A/B Tests and Comparing

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Hydron:
When I've done this kind of test I've used a 50R terminator on the scope input as both a well-matched load and the I-to-V conversion for the reference channel - basically have the co-ax from the sig-gen split into 2 wires at the half-way point (BNC to banana adapters are probably good enough here for <3MHz, I use a shielded box for higher frequencies), clamp onto the non-ground wire, then terminate into 50R on the scope. This gives 1V/A or 0.1V/A on the probe and 50V/A as the reference.

Algasman:

--- Quote from: EEVblog on October 23, 2020, 11:00:22 am ---
--- Quote from: Algasman on October 13, 2020, 09:13:23 pm ---After following the discussions and trying to decide if I should go with the A or B version, I decided for the economic more bang for the buck A-Version.
Last week I got it delivered so I wanted to check the performance myself. The results are almost too good to be true, so I would like to know if you agree with my test setup.
(Attachment Link)
SDG1032X as source, feeding a BNC-connector through 5 loops on the current probe clamp into 3x150 Ohms. SDS1204X-E Channel 1 Voltage of 50 Ohm load resistor, 10x Probe, Channel 4 CP2100A 2x (because of the 5 turn coil)
(Attachment Link)
During measurement, I maintained 2,50V RMS over the load resistor, and measured the current as RMS (nominal 50mA)
(Attachment Link)
This picture shows the voltage and current @800kHz, the nominal bandwidth of the CP2100A.
(Attachment Link)
To me this looks much better than the specs, is my setup suitable for bandwidth measurement?

--- End quote ---

The bandwidth of the A model is 2.3MHz?  :-//

--- End quote ---
Yes, I was skeptical too, that’s why I put it up to discussion on your excellent forum!
The similar data from bicycleguys B-type probe pretty much confirms my claim and also Elasias binning theory.
Would be nice to see other A-type measurements (and also B ones)

bicycleguy:
Algasman
I'm not sure that multiple turns thru the clamp are within the spec.  Sure it makes it work better as I show here:

--- Quote from: bicycleguy on October 23, 2020, 09:42:58 pm ---Redid some data with 5 turns. See edit above.  Maybe should toss the 1 turn for consistency.

--- End quote ---

But how many turns? Where would you stop.  I now think the 5 turn should be dropped and if you re-did with just 1 time thru the clamp your results would match the spec.

Martin72:

--- Quote from: Algasman on October 24, 2020, 01:11:03 pm ---Would be nice to see other A-type measurements (and also B ones)

--- End quote ---

I´v turned a wire 10 times through the coil, for load I´ve used the integrated 50ohm input and then start bode plot.
Result, see link above.

Noy:
Currently i have a CC-65 (working ok but its more a toy, but it has 10mA resolution...)
Normaly Im measuring in the below 5/3 A range.. So the micsig with 50mA resolution is a bit less attractiv but 800kHz (maybe more ;-) ) would be nice for switching regulator stuff these days (CP2100B would be nice but to expensive for the "sometimes" use case... ) and i can use multiple turns to get a higher resolution...

I found CP2100A for 140€ inkl. Shipping in Ali Express to Germany. Good offer or are these things fake / doesnt meet binning specs?
Should i order better from Batronix?

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