Products > Test Equipment

Micsig CP1003/CP503 100MHz/50MHz Current Probe

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amar87:
Yes, will try again with the clamp in the locked position, i also think i am doing something wrong. Will do some more measurements when i have time. I want to get to the bottom of this.

I have been thinking also the following : maybe 1 Vrms /50R = 20mA  and it is exactly on the edge.

 

Martin72:
Please do that, the Micsig is still of interest because it is simply very compact compared to a Tektronix combi.

amar87:
Aparently when having too many pictures inline the forum doesn't display the message correctly for some reason second time i write this .....

I tried to check my setup first:

_Wim_ suggested to see first if the bode plotter is ok so here we go:

- CH1 1 Meg
-  CH2 50R
- Used the 'butchered' BNC





We notice a 0.6 dB increase at 25 Mhz compared to the rest of the frequency range.

Next i replaced the 'butchered' cable with normal BNC RG58



The response i a lot flatter.







amar87:

I wanted to see what happens if the probe will just stay on the coax.... so don't ask why



Something weird happens now this is a scope problem but however maybe it give a clue on the issue

Ran the bode plotter 2 times first run gives this:



Second run:



I can't explain the 3 dB shift. This is related to what _Wim_ said in a previous post.

But my conclusion so far is having the probe on the coax does not change the frequency response wanted to see just in case.

amar87:
Sorry for writing so many messages but i put everything in one and it somehow wasn't displaying correctly so i had to delete it.....

After all of the above ran the test again this time with the probe inserted trying to figure out the reponse from the probe up to 25 MHz.



Probe is locked this time:



Displays 20 mA = 1 Vrms / 50R :




And it give this bode plot (i also placed markers ):





So i have reached the limit to what i can test.....  the thing is not flat or my scope measures crap, but i don't know if  the 2 dB should  be right.






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