Kelvin- There are quite a few relevant papers on Istvan Novak's web site. ( http://www.electrical-integrity.com/ ) Specifically, check the following papers (amongst others) in the paper download section: http://www.electrical-integrity.com/Paper_download_files/DC10_12-TH3_Nov ak-Mori-Resso.pdf http://www.electrical-integrity.com/Paper_download_files/DC03-East_HP-TF 1_Measurements.pdf http://www.electrical-integrity.com/Paper_download_files/DC00_MeasuringM iliohms.pdf http://www.electrical-integrity.com/Paper_download_files/DC99_ProbesAndS etup.pdf There are also numerous other papers available online at other sites as well as whole books on the topic, but the above list of papers is probably a good place to start. -Ray Raymond Anderson Senior Signal Integrity Staff Engineer Programmable Platforms Development Silicon Technology Group Signal Integrity and Package Development Department Xilinx Inc -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of kelvin.harding@xxxxxxxxxxxxxxx Sent: Monday, November 22, 2010 2:52 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] What is a good method to test the impedance of a PDS? How should I test the impedance of: 1) Bare PCB 2) Populated PCB. What test equipment is required? How do I calculate the acceptable parameters for the design? If this is too general then please point me to relevant reading. Regards, Kelvin ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately. ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu