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 Post subject: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Jan Thu 19, 2017 3:34 am 
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Location: Canandaigua, NY
I see the socket where the optional 10811-60111 ovenized oscillator plugs in. They seem to be available on the 'bay. Is it just a matter of plugging it in? What happens to the standard crystal oscillator on the main board? Are there pitfalls for the unwary- me?


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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Jan Thu 19, 2017 4:01 am 
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Get a GPS-disciplined 10MHz frequency standard and plug it into the EXT timebase input on the back panel.
Set the adjacent switch to EXT and enjoy.

This has the advantage of being usable with subsequent/other counters if desired.

- Leigh

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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Jan Thu 19, 2017 5:04 am 
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Yup, I know that, but I still want to upgrade the internal oscillator if possible. (That will make it worth more for my wife after I croak!)


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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Jan Thu 19, 2017 1:20 pm 
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To install the HP oven you will need to remove C8 and install C100 which may just mean moving the cap from one position to the other. Switch the timebase to internal. Look at the "Timebase/ Power supply block assembly" schematic here on page 230 to see what Im referring to.

http://www.ko4bb.com/manuals/96.89.184. ... v-1991.pdf

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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Jan Thu 19, 2017 4:17 pm 
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Thanks! I would have taken forever to spot that. An oscillator is on the way- hopefully a working one.


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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Feb Thu 02, 2017 5:40 pm 
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Just an update- the eBay oscillator arrived in perfect shape and the installation went smoothly. I had to shorten some long screws to just the right length, and the pdf manual I've got was a bit fuzzy on the cap designators, but an ohmeter quickly solved that. Amazing thing is the oscillator was closer to a zero beat with WWV (after warm-up) than I probably could have gotten it, so I left it alone.

I've never seen a crystal in a TO5 can (the old one that they have you remove). Also, there's an oven fine tuning circuit next to the oven but I didn't see any instructions as to how to adjust it. Does it tweak the temperature?

Anyway, seems like a fine upgrade until I get some stand-alone gps or similar lab standard.

edit- found the bit about the external adjustment. It can adjust the frequency over a range of about 1 Hz via a varactor diode. Handy if I ever get a better standard.


Last edited by Conrad Hoffman on Feb Fri 03, 2017 1:28 am, edited 1 time in total.

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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Feb Thu 02, 2017 10:37 pm 
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Good Job and congratulations!!!

Glad to see your new time base is right on the money, and all went well.

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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Feb Fri 03, 2017 2:51 am 
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Sounds like all went smooth. The TO-5 crystal is common in many oscillators as is the TO-8. After a week of staying on power that oscillator will age to stability and you can fine tune it. All oscillators have an initial aging that slows over time. That particular OCXO was the lowest phase noise and best of breed oscillators in its day.

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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Feb Sun 28, 2021 6:15 pm 
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Joined: Sep Mon 09, 2019 3:47 am
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flyboy71 wrote:
To install the HP oven you will need to remove C8 and install C100 which may just mean moving the cap from one position to the other. Switch the timebase to internal. Look at the "Timebase/ Power supply block assembly" schematic here on page 230 to see what Im referring to.

http://www.ko4bb.com/manuals/96.89.184. ... v-1991.pdf

Hi Jeff
I could not find page 230 mentioned above. HP use X-XX format for page numbering. Could you help please?
Thank you
Arnon Schreiber
arnon.schreiber@gmail.com


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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Feb Sun 28, 2021 6:51 pm 
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In my manual the info is on 8-475. It's now been a while and I recently got a Leo Bodnar mini GPSDO and tweaked the unit. Working great and far better than I'll probably need.
http://www.leobodnar.com/shop/index.php ... &cPath=107

Also more here- http://www.ko4bb.com/getsimple/index.ph ... Oscillator


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 Post subject: Re: HP 5334B Counter- Upgrade internal oscillator
PostPosted: Feb Sun 28, 2021 10:09 pm 
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4-year-old-thread-alert :)

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