Vrenda, The X2Y web site www.xy2.com has an application note that I wrote for extracting capacitor parameters. That method uses S21. A couple of points: 1. The smaller the test board the better to extract the ESL of a raw capacitor. A 2x2 board will up to 500MHz or so. 2. The simple single RLC model is overly pessimistic at high frequency. See the DesignCon 2005 TK7 proceedings. Steve At 11:46 AM 5/26/2005 -0700, Virendra wrote: >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