[time-nuts] HP5334B with 10544 OCXO

Randall Prentice randall.prentice at pscconsulting.com
Mon Jan 30 16:55:15 EST 2012


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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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" <Mark_Allwright at kindermorgan.com>
Sent: Monday, January 30, 2012 4:02 PM
To: <time-nuts at febo.com>
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 -- time-nuts at febo.com To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
> 


_______________________________________________
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.




More information about the time-nuts mailing list