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Upgrading Counter 53220A to Option 010 Ultra High-stability OCXO Timebase?

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pamphonica:
Thanks Steve, I've asked the vendor for a replacement.  I know that these modules can be ordered with no reference voltage output.  It's re-assuring to know your identical one worked fine with the 0R resistors removed as indicated.
-Jeremy

Update: the vendor says that these modules have no connection to pin 4 (voltage ref out). There are a number of vendors on Ebay but all at higher prices.  Maybe I'll try another vendor and see if these ones are cheap because of faults.  Weird.

rkeller:
Is there a consensus on the OCXO DIY upgrade.
Hesitant to take apart and start soldering in Chinese sourced Vectron C4550A1-0213's that have been removed from other equipment.
Tried to find these new but no Joy.
Has anyone got a concise DIY upgrade path.  I checked Keysight https://www.keysight.com/main/editorial.jspx?cc=US&lc=eng&ckey=2190178&nid=-33609.959902.02&id=2190178
It states the 010 upgrade is "not available" for those of us with non 010 units.
Seems simple enough, but for now the OCXO with the GPS timebase at 10 Mhz going in the back works but isn't the best solution especially if I need to carry the unit to another work station.
Thank you,
Russ

tkamiya:
High-end counters often don't come with OCXO standard and built-in oscillators are usually awful.  This is because it is expected that customer will either use shop standard or pick an OCXO.  Shop standard being more common, later customers don't have to pay for extra.  This will be a significant amount of money when buying ten or more counters!  Standard oscillators are there just to check that the equipment works.  It was never meant to be used for measuring anything.

I typically don't like internal OCXO on counters.  It means separate calibrations and they will never be exactly the same.  This makes it impossible to check correlations.  Also, counters will keep OCXO turned on while equipment is turned off.  That means heat generation and power consumption.  Having few of these, it adds up. 

If this is for business, I would really NOT mess with it myself.  I would have certified hands do certified work and come back with certificate of the job performed and the result.  Can't imagine what would happen if unthinkable happens and thousands of miscalibrated products going out the door.  Compared to that, what HP charges is cheap.

F64098:

--- Quote from: pamphonica on December 18, 2019, 08:00:04 pm ---I just put in a Vectron C4550A1-0213 from Ebay (from China) into my 53220A. It oscillates fine but the internal reference voltage output seems to be missing (looks like open-circuit), so the calibration routine failed.

My fix (for now) was to re-install R828 (0R) which re-connects the internal +5v reference to the adjustment circuitry. This strap was needed for the original smaller oscillator module as it has no reference voltage output.  Cal worked perfectly once this was done.

Has anyone put in one of these specific new/used devices from Ebay and tried the "Cal Step" routine? If this is a feature of this secondhand module, so be it, but if yours worked fine, than please let me know so I can get a replacement from the vendor.
--- End quote ---

I bought a bundle of 5 used OCXOs and 3 of them have the 4V Reference output enabled. Looking at the markings there are no differencies in type or mfg date.
Try your luck: https://de.aliexpress.com/item/4000760950500.html

Put one in my 53220A and i'm very happy  ;)

Best regards

Frank

SoundTech-LG:
No Luck...

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