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Upgrading Counter 53220A to Option 010 Ultra High-stability OCXO Timebase?
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F64098:
Oh i'm very sorry,

got my items just a few days ago and c&p the link without
an actual click on it.
But there are other sellers with similar items.
From my view it is now shure, that the suffix -0213 don't say
anything about the optional reference voltage on pin 4.

Another user made the same experience: https://www.eevblog.com/forum/metrology/how-to-unsolderremove-ocxo-from-pcb/msg4030306/#msg4030306

HTH

Frank
hartvige:
Just got a couple of C4550A1-0213 devices off Ebay, and both of these do not drive the reference voltage (4.0V nominally) out on pin 4.
It seems really odd that devices with the same marking and P/N (-0213) behave differently in this regard.

Someone mentioned that the pin 4 output was a selectable option in the P/N.
However, looking at:

https://www.vectron.com/products/ocxo/C4550.pdf

This does not seem to be the case. As I read the DS, all devices should drive this pin. Which begs the question: the -0213 devices that don't do this, are they simply broken?
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