Make X100 'scope probe from X10

Jun 04, 2009 2 Replies
G

I've been measuring a lot of small capacitances (C) lately, I've been using this old TEK X10 'scope probe with 8.5 pF of C. (All the new probes stink, 12 - 16 pF) But It would be nice to reduce that number and I'm willing to give up another order of magnitude in gain. So I can stick 90 Meg ohm on the end of the probe. Is the parallel C that I need to compensate it with about 1pF? I've seen this done before but can't find the article or application note.



Thanks, George Herold


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J

Yup. You could use a gimmick capacitor, some twisted insulated wires, and twist them to adjust compensation.

Or buy an AADE l/c meter. They are great.

John

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G

Excellent I've ordered my own AADE. I've never tried the gimmick gimmick, and I'll give that a whirl too. (PI)

George H.

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