I have posted my latest technical tidbit on http://emcesd.com that discusses one way probing a signal can distort it as well. Ever have a circuit only work when a scope probe is connected? One possible answer is in the article.
Abstract: Probing can have significant effects on the signals being measured. One of these effects, resonance between probe input capacitance and lead inductance, can be simulated with a trimmer capacitor and its connecting leads. Such a "tuned probe simulator" can both provide insight on how probing affects signals and help troubleshoot circuit problems as well. Tuned probe simulators for passive and active probes are discussed. UC Berkeley Extension is hosting my high frequency measurement/troubleshooting course in early March. The link to the course is: http://www.unex.berkeley.edu/eng/elec/313544.html 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: [email protected] \ _ / ] \ _ / Web: http://www.dsmith.org This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
