Thanks.. I'll likely do some more testing with the 50 ohm load in place and see how stable this unit is before investing more time in this.
----- Original Message ---- From: Bruce Griffiths <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Fri, December 24, 2010 10:05:51 PM Subject: Re: [time-nuts] 10811 changing frequency when load impedance changes ? Mark Spencer wrote: > Seasons greetings. > I was pleasantly surprised to find that a new to me HP 5328A had an 10811 in > it. (I was expecting the older OCXO..) After leaving it running for a > week I adjusted the frequency and while doing so I noticed that the out put > frequency changes by a third of a hz or so if I add or remove a 50 ohm load. >I'm measuring the frequency at the timebase output connection of the > 5328A. Is this to be expected ? > > Many thanks > Mark Spencer > > > > _______________________________________________ > 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. > > No, that seems to be a couple of orders of magnitude larger than the specs for the 10811A would lead one to believe. Maybe there's a problem with the output buffer amp in the 10811A? Bruce _______________________________________________ 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. _______________________________________________ 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.
