Hi all, I have been on a steep learning curve on my new 5372A. It's a lovely instrument but does seem to have a higher degree of trigger jitter than I would expect. Going on previous experience with other unrelated instruments I began by checking the power supplies. (in fact it's hard to go much deeper without the unobtainium extenders :-(
Anyway the power supplies all check out OK voltage wise but the -15 does have a higher amount of twice mains freq ripple than the others. It's about 0.5 V p-p at the test point on the triple regulator board and looks like a sawtooth i.e. what you see from inadequate filtering. The service manual is unhelpful as it doesn't give schematics, just says to replace the regulator board! The -15 features on the schematics for many other parts of the 5372A that would be expected to contribute to trigger stability. My questions are: 1. Could anyone on the list with a functioning 5372A slip a scope probe onto the -15V test point and check the ripple on a known good unit? and 2. Has anyone had to deal with this this problem before? Thanks, Morris _______________________________________________ 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.