[time-nuts] hp 10544A and 10811A ovenized oscillators
frank.stellmach at freenet.de
Mon Nov 5 13:23:03 EST 2018
> A failed ( = cold) oven on either a normal OCXO should give you a
"tens of ppm” sort of frequency error. At 10 MHz that would be over 100
Hz. Fractions of a ppm are less likely to be oven issues.
You're completely right about the ballpark of a total failure..
Anyhow, I would check the correct operation of the oven; the 10811 oven
draws about 500mA cold, which goes down to about 150mA after 15 minutes,
when it's warm.
I'd also check the continuity / resistance of the NTC, which can easily
be accessed by just opening the metal top cover (leaving the 2 screws
for the connctor alone), and gently pulling off the styrofoam lid.
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