[time-nuts] Bad batch of HP10811's

Didier Juges didier at cox.net
Mon Jan 15 23:58:59 UTC 2007


That sounds like an awful lot of drift, absolutely inconsistent with a 
crystal oscillator of any kind.

Either this OCXO is really sick, and just happen to end up at the right 
frequency by accident, or it is an OCO (Oven Controlled Oscillator :-)

Didier KO4BB

Jeroen Bastemeijer wrote:
> Dear Rick,
>
> Are you sure the 500Hz is too much for a cold oven? I checked my 5345A 
> (recently acquired) counter, which was switched off for some time. 
> Measuring the frequency directly after applying power and switching on, 
> resulted in about 1640 Hz frequency offset. After warm up, the error is 
> below 0.4 Hz. (The unit used here is a 10811a). The error drops pretty 
> fast, allthough I didn't measure an accurate curve. Is the frequency 
> difference caused by the tempco of the oscillator circuit?
>
> Cheers, 73s Jeroen PE1RGE
>   





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