Usually the PPS output from the Z-series GPSDO is a 26uS wide (from the HP58503A datasheet) TTL pulse. To measure it you must use a fast oscilloscope (because of the fast pulse rise time) and an analog or digital memory (because of the very low repetition rate). The best is to use a digital sampling 'scope and set the trigger to NORMAL.
On Sat, Nov 24, 2012 at 11:42 PM, Mark Spencer <mspencer12...@yahoo.ca>wrote: > Greetings. I recently acquired two Z3805A gpsdo's from the usual auction > site. (These units look like a Z3801.) > > Does any one know the specified output level for the 1pps signals or have > a high confidence measurement of the output voltage that they could share > with me ? (Measuring fast rise time signals is not really my forte and I > don't trust my measurements of an apparent .15 volt pulse.) > > The status message sent from the units via RS 232 contains a TFOM ( time > figure of merit ?) variable and I've seen that phrase used in conjunction > with equipment that outputs a 10 volt 1 pps pulse. > > On a side note so far I'm pleased with the performance of the units (the > 10 Mhz output of better of the two has a typical adev in the low 10e-12 - > high 10e-13 range, and appears to be improving.) > > Thanks in advance for any comments. > > Regards Mark Spencer. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.