virendra It is suggusted that S21 is applied. In the 2-ported network, S21=Zx/(Zx+Zc/2), which is not sensitive to the measurement error. Istvan has published a paper about the topic in DesignCon. There is also a paper in the Agilent website. I hope this is helpful. Best Regards Zhangkun 2005.5.27 ----- Original Message ----- From: "Virendra" <adsurevv@xxxxxxxxx> To: <si-list@xxxxxxxxxxxxx> Sent: Friday, May 27, 2005 2:46 AM Subject: [SI-LIST] S11 or S21 > Hello All, > I am trying to measure the esl of a ceramic capacitor. > I have a test board of 2"x 2" for this. I have SMA > connectors connected to two sides of the test board. > Now to extract the esl of the capacitor, is it best to > measure the S11 or S21. > Given that S21 gives lesser measurement errors does it > still make sense to measure S21 when the two > connectors are 2" apart? > > thanks in advance, > virendra > > > > __________________________________ > Do you Yahoo!? > Yahoo! Mail - Helps protect you from nasty viruses. > http://promotions.yahoo.com/new_mail > ------------------------------------------------------------------ > 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 > > ------------------------------------------------------------------ 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