Greg, > ...scope. The question is: is it a simple subtraction process, (jitter out - > jitter in = jitter contributed by my card) since the jitter has both > deterministic and random components? I would expect the jitter to follow more or less some noise like distribution (i.e. trhe latter would look like a Gaussian curve). In this case, the total jitter would be the square root of the summed squares of the contributing sources. Dimiter -------------------------------------------------------------------- Dimiter Popoff Transgalactic Instruments, Gourko Str. 25 b, 1000 Sofia, Bulgaria http://transgalactic.freeyellow.com Email: tgi@xxxxxx Phone: 00359/2/9923340 ------------------------------------------------------------------ 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