Dear all Now, we are measure DC resistance of power plane in PCB. The presision should be 0.1 mohm at least. However, because of the clamp of the meter, the error is about 1m ohm. In another word, the difference between two measurement for the same DUT is about 1 mohm. Is there any advice about this topic? Anything will be help. In your measurement, how to connect the probe to the plane? Best Regards Zhangkun 2006.8.22 ------------------------------------------------------------------ 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