Completely agree with Brooke, with one addition. Measure power supply voltages at the supply and at the chips. If the power is not right, there's no need to look for something more complex.
If the voltages look OK, check for noisy power. Bill Hawkins -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brooke Clarke Sent: Tuesday, May 05, 2009 9:52 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Data Precision 8200 Voltage Standard Hi Skip: Don't know this unit, but can comment on this kind of problem. The most likely cause is a poor (oxidized) electrical connection. So if there are switches, connectors, sockets, etc. involved then they need to be cycled a few times. See What Goes Wrong: http://www.prc68.com/I/HaT.shtml#Wgw Another possible problem relates to electrolytic caps where the electrolyte has gone bad. You need an Effective Series Resistance (ESR) meter to check them, see Capacitor Failure: http://www.prc68.com/I/HaT.shtml#CF Have Fun, Brooke Clarke http://www.prc68.com _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
