Products > Test Equipment
Micsig CP1003/CP503 100MHz/50MHz Current Probe
amar87:
--- Quote from: cameronb on January 07, 2024, 11:53:19 pm ---I picked up the CP503 from SAELIG. It looks to require only a 5V/3A supply. Noise is not critical as it drives a buck converter and linear regulator.
Here's what's inside
GDE232E (Arm Cortex).
TI54331 buck converter + AMS1117 provide a clean 3.3V rail for the analog end of things.
OPA4171 probably related to range selection from the DAC on the GDE232E
As far as I can tell, there are no electrical connections to the 3.3V and -5V rails.
I've confirmed all the digital bits are running directly off the 5V rail.
It's probably as easy as passing a USB cable into the housing. I'll try it tonight and report back.
--- End quote ---
If you have the time could you also try to do same experiment as Martin and me and report back the result?
Martin72:
--- Quote from: amar87 on January 08, 2024, 12:43:45 pm ---I tried some more experiment:
--- End quote ---
I can't see any difference between your setup and mine, should the current clamp really be that "bad"...
But I can't believe that this is normal for a model costing over €1000.
Perhaps the people at Meilhaus can check this on another Micisg.
_Wim_:
--- Quote from: amar87 on January 08, 2024, 12:43:45 pm ---if i compare the bode plot from the scope and the one from the spredsheet they don't really look alike. And that dip at 30 Mhz i don't get why it is. Maybe the probe is actually like this ...
--- End quote ---
I would first try to figure out why you get different results. First thing I would do is make a bode plot of the signal generator only (so feed the signal both to the 50ohm input AND the 1M input. This should give a flat response, if not, investigate further.
I also would try a figure out why with the external the signal goes down when the frequency goes up, and it is inverse with the internal signal generator.
If you repeat the plot multiple times (with for example the internal signal generator), do you get everytime the same result, or is the result more random in nature?
_Wim_:
One more question, are you sure the slider is fully closed (should be in the "lock" position to measure)
Martin72:
Woah, Eagle-Eye! :-+
It could be, no, it will be.
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