Hi All,
Most of us use active probes because we believe they have a
high input impedance. However this is not usually the case
in the upper octave of their stated frequency range. My
Technical Tidbit article for August, 2002
(http://emcesd.com) presents measured data on a popular
active probe typical of most on the market. You may be
surprised at the result. I also give an example of a good
active probe that has reasonable input impedance and
response over its stated frequency range in real measurement
situations. Its instruction manual also gives good
equivalent circuits and other data necessary to use an
active probe properly. It is one of the best probe
instruction manuals I have seen relative to the sheer amount
of information given. (I have no connection to or financial
interest in the probe I use for the example, it just happens
to be one of the best I have seen.)
Doug
--
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___ _ Doug Smith
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========= Los Gatos, CA 95031-1457
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| q-----( ) | o | Email: d...@dsmith.org
\ _ / ] \ _ / Website: http://www.dsmith.org
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