Products > Test Equipment

OCXO Upgrade for KS 33521B - Looking for info

(1/6) > >>

swixo:
Hello EEVBLOG world,

Id like to upgrade my 33521B from TC to OC.  I did my 53220A and it works fantastically.

https://www.eevblog.com/forum/testgear/updating-agilent-counter-53220a-to-option-010-ultra-high-stability-ocxo-timebase/

The 33500 series looks to have similar upgradability, but I cannot find info on how to inform the
instrument that the change was done.  In the 53220A you remove two 0 ohm resistors.  Its possible
the 33521 just detects it somehow.

Does anyone know?  Does anyone with the OCXO option in a 33500 series have pix you can post so
we can diff the components/jumpers?

Thanks

s

TheSteve:
Post some pictures of the PCB.

swixo:
OR: Does anyone already HAVE the 33521B/33522B unit - or a similar model, with the OCXO
and knows what part they have used?  Keysight has no info on this
obviously.

eb4eqa:
Hello,

I just replaced the original TCXO on my 33521A with the same part suggested in https://www.eevblog.com/forum/testgear/updating-agilent-counter-53220a-to-option-010-ultra-high-stability-ocxo-timebase/ and it works just fine.

Very simple procedure, remove original one and put this in place. 10 minutes if done carefully. Nothing else needs to be done.

The firmware does not notice the change and the About screen does not say anything about High Stability Option, but even the calibration routine does it's job trimming the frequency of the TCXO. I am not even sure this upgrade is actually announced on the About screen on a properly factory-upgraded unit. I haven't found any suspicious hardware mod to tell the CPU about the change, it might be a firmware tweak.

Warmup time is obviously longer now but stability is a lot better, once stable that is   :-DD :-DD

Regards,
Roberto EB4EQA

TheSteve:
The official upgrade is noted in the about screen.

It also says "installed" instead of "licensed" so I am sure there are some jumpers somewhere to indicate it is installed.

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod