Subject: [SI-LIST] Re: How to Measure Ground Noise From: Doug Smith <doug@xxxxxxxxxx> Date: Wed, 06 Apr 2005 13:01:22 -0700 To: si-list@xxxxxxxxxxxxx I received a not very helpful error message for my post to Pyng, so here is a retry: Hi Pyng, There are some articles on my website that bear on your problem. http://emcesd.com/tt070199.htm http://emcesd.com/tt061400.htm http://emcesd.com/tt2001/tt010101.htm http://emcesd.com/tt2002/tt090102.htm (especially important to your issue) Hope some of these articles help. Doug ......many lines deleted >> >> >> >> ospyng wrote: >> >> > >>>>hi, >>>>I was taught to measure ground noise, by having the ground of the >>>>probe connect to ground TP of the board and the tip of the probe >>>>measuring the same TP. >>>> >>>>is this the correct where? and Why? >>>>is it because of the ground cable (3 inch) cause a loop, therefore the >>>>reference and the tip of the probe has a different voltage? >>>> >>>>thanks >>>>pyng -- ------------------------------------------------------- ___ _ 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 ------------------------------------------------------- ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu