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[SI-LIST] active probe issues and effects on SI
- From: "Douglas C. Smith" <doug@xxxxxxxxxx>
- To: si-list <si-list@xxxxxxxxxxxxx>
- Date: Sun, 04 Aug 2002 09:09:03 -0700
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.
Two upcoming seminars you may be interested in that I am
teaching:
EMC:
http://www.elliottlabs.com/services/seminars/emct_081802.htm
High frequency measurement, design, and troubleshooting:
http://emcesd.com/seminars/tolh0902.htm
Both include many realtime experiments to illustrate the
concepts being discussed.
Doug
--
-----------------------------------------------------------
___ _ Doug Smith
\ / ) P.O. Box 1457
========= Los Gatos, CA 95031-1457
_ / \ / \ _ TEL/FAX: 408-356-4186/358-3799
/ /\ \ ] / /\ \ Mobile: 408-858-4528
| q-----( ) | o | Email: doug@xxxxxxxxxx
\ _ / ] \ _ / Website: http://www.dsmith.org
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