There is a section in the HP5334 Service manual on changes needed. The oscillator uses either the internal crystal (The trimmer is connected to) or the 10811.
Basically you change a capacitor feeding from one to the other. I could scan the appropriate pages if you need (Contact me off list). Regards Randall Prentice Stokes Valley Lower Hutt 5019 New Zealand ZL2RJP -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roy Phillips Sent: Tuesday, 31 January 2012 10:40 a.m. To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP5334B with 10544 OCXO Mark By chance I have just today installed a recently acquired 10554 OCXO into my HP 5334B Counter. Its has been running for 5 hours and is yet to stabilize - my Manual suggest that 24 hours is the required time. Despite reading the manual, I cannot see any reference to the change over from the "low grade" inbuilt oscillator - is this automatic or does it require a jumper alteration. I seem to recall that Rick Karlquist referred to a voltage "droop" in the PSU occurring, due to the additional load of the oven as a consequence of fitting the OCXO to the 5334B. I assume that this is when the oven is taking maximum current - perhaps he will offer some help (again) as I cannot find his earlier comments ? I note that the rear "simple" oscillators trimmer is still operative - should this be so ?, or is it indicative to a need to disconnect it ? Again, any comments would be appreciated. Regards Roy -------------------------------------------------- From: "Allwright, Mark" <[email protected]> Sent: Monday, January 30, 2012 4:02 PM To: <[email protected]> Subject: [time-nuts] HP5334B with 10544 OCXO > Hello. > > I recently bough an HP-5334B counter with option 010 from the big "E". > A Google search seems to indicate the OCXO should be a 10811 type OCXO > but mine has a type 10544. > > Other than taking longer to warm up does anybody see any problems with > this? Basic testing shows the unit seems to work OK. It is reading > 1.7 Hz low compared to my Thunderbolt at 10 MHz - I have not tried > adjusting the trimmer on the 10544 yet. > > Comments and thoughts appreciated. > > Regards. > > Mark. > VE6NTP > > -- > Mark Allwright > > > _______________________________________________ > 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. _______________________________________________ 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.
