[time-nuts] HP 10544A Repair

Richard (Rick) Karlquist richard at karlquist.com
Tue Mar 1 23:33:10 EST 2016



On 3/1/2016 4:13 AM, Bob Camp wrote:

> Is it worth getting it super close? Probably not without a temperature test setup.
>
> Bob
>
Right.

It is entirely possible that if you did a temperature test
in an environmental chamber, you would find that you
could get a better tempco by adjusting oven set point
to have a slight offset from the turnover.  In this regime,
the crystal drift would cancel out the tempco of the
electronics.  This all depends on the crystal tempco,
the electronics tempco, and the respective thermal gains
to the crystal and the electronics.  But there will be
an adjustment giving zero tempco (at least around a single
ambient temperature).  My old boss at Agilent used to
call this sort of thing a "hero experiment", which he
used as a pejorative term.

Rick


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