[time-nuts] 10811 changing frequency when load impedance changes ?

[Bruce Griffiths]

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 -- time-nuts at febo.com
> 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