[time-nuts] Bad batch of HP10811's

[Rick Karlquist]

No I'm not sure, but 164 ppm sounds high.  My anecdotal
memory may be faulty.

In any event, a 10811 with a bad fuse is obvious:
it draws no oven power and the case never gets warm.

Rick


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?
>
>