"Loyer, Jeff W" wrote: > . stuff deleted.... > I believe Polar Instruments TDRs are less susceptible to ESD damage, since > they can afford to put ESD protection on their heads (their rise-times are > accordingly slower). The problem is that I don't believe their instruments > measure differential impedance/length. > > Jeff Loyer > >. Note that the heads in the Polar Instruments TDR are actually specially modified Tektronix SD-24 heads. -Ray ------------------------------------------------------------------ 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 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