Tegan, David gave a good description of the 11801/CSA803 capabilities, options, and limitations. Be aware that the 11801/CSA803 and accompanying plug-ins including the SD-24, etc. have all been discontinued. Their service life may also be limited due to dwindling availability of parts. We have some of these 'scopes and heads, and we keep getting warnings from Tektronix about how they don't know how long they'll be able to fix them. They are available on the used market, but the SD-24s in particular are getting hard to find and very expensive. So, if you plan to keep it for a long time, you might be better off with the CSA8000 or the similar box from Agilent which are both current products. Good luck in your search. Thanks. Jay Diepenbrock Senior Engineer Interconnect Technology & Qualification IBM Global Procurement, B8UA/061, RTP, NC Phone: 919-543-8804 Fax: 919-543-3642 Email: jaydiep@xxxxxxxxxx ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field 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