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Micsig CP1003/CP503 100MHz/50MHz Current Probe

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amar87:
i will conntinue tomorow after reading your posts, i bought the probe from Meilhaus electronic last year probably the price is the same now i waited for it a long time and it also came with a china USB- 230V  adapter, and you can't power it from the scope because it needs some more juice than the scope can provide, it also seems that it doesn't want to work with other phone chargers i had arround .
 

Martin72:
Hi,


--- Quote ---Test Setup for Accuracy 6 A range :

- same as above + the following:
- DC electronic load
- Fluke 8846A Multimeter (not calibrated)
--- End quote ---

If you compare this with a multimeter, I would also measure the output of the current clamp with a multimeter.
There are BNC to banana plug adapters.
Apart from that, I'm no longer surprised that the current clamp is so "off" at very low mA values after I've seen the specs.
There the measuring range is specified from 20mA or 50mA (6A/30A).

A bit sobering as far as the 6A range is concerned.
Seen earlier, Batronix now also has them on offer, both variants in stock.
https://www.batronix.com/versand/messtechnik/tastkoepfe/Micsig-CP503B.html


amar87:
Yes i expected it to be off at currents lower than they give in the datasheet, you are absolutely right. i just put those measurements in there because i wanted to see how bad it is or to better put it if it could be used. But what i observed is that the error (below 20mA in the 6A range and below 50 mA in the 30A range) is mainly caused by the offset that it has after zeroing. What i also observed that this offset  has a tendency to drift after zeroing. maybe some interesting experiments would be observe when it stops drifitng. Strictly speculating with the info i have at the moment this could be the the reason why they give the +/- 10Ma after the percentage.

I can also plug it in the multimeter witha BNC Banana adapter, but then how to compare it ? The DC load i used (Rigol DL3021A) needs to be stable. (which i have no idea how stable it is ), i could take a reading DC load on X mA in the shunt of the multimeter, then same with current probe plugged in the multimeter on voltage? Then we don't know how accurate the multimeter is on voltage vs on current. Then the sampling rate and bandwidth from the multimeter is lower than the scope.......... This makes me go crazy....

How i did it before i am actually showing the error from the scope + the error from the probe actually(which is also not very scientific ).... this is not easy to do...

What confuses me here is the spec of +/1%+/-10mA(6A Range) and it measures above 20mA whatever is under that you can't trust. Let's assume my fluke is perfect. i read on the fluke 22.9 mA on the scope 25 mA. Is the probe in spec or not ?     

Also the reason for not testing over 6 A is that i have no power supply that provides more than 6A.   




Martin72:

--- Quote ---Also the reason for not testing over 6 A is that i have no power supply that provides more than 6A.   
--- End quote ---

You can turn windings over the core of the clamp.
Example:
Turn a wire (Measure lead) 5 times around the core, feed in 1A, the currentclamp will measure 5A...
Like I did in the pic below.


--- Quote ---What confuses me here is the spec of +/1%+/-10mA(6A Range)
--- End quote ---

For me it reads as +/-1%, but at least +/-10mA.

_Wim_:

--- Quote from: Martin72 on January 04, 2024, 10:44:49 pm ---For me it reads as +/-1%, but at least +/-10mA.

--- End quote ---

I would expect this to be the sum of both: so +-1% of the measured value plus an additional +-10mA. This means when putting 6A through, you end up with +-70mA.

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