[time-nuts] HP 5345A

[John Miles]

There's no manual fine-tuning adjustment on the 10811A, which is something
I've always found strange.  The trimmer that is present is arguably far too
coarse.  I've owned 10811As that would stay put within a couple parts in
1E-10 per year, but setting them to that degree of precision was a real
pain.

They do have an EFC control line, though, which the 5345A uses to phase-lock
to the external 10 MHz input.  (Unlike, say, the 5370B, which just
substitutes the external 10 MHz signal for the OCXO's own.)

-- john, KE5FX


> I just picked up a 5345A from eBay. This unit has a 10811
> oscillator instead of the 10544 depicted in the manuals I have.
> The serial number has been removed. Does anyone know if there is
> an EFC adjustment for this counter or is the course control the
> only way of setting frequency?
> Colin
>