On 04/12/2011 10:05 PM, WB6BNQ wrote:
Hi Joe,
You should have left the frequency adjustment alone for at least 30 days and
more
like 90 days. On a high quality oscillator it takes at least 30 days minimum
for
the package to stabilize. Otherwise you will just be chasing all the mechanical
stresses, including the crystal itself, that take that long to settle out.
Changing the adjustment causes additional stresses that need time to settle. It
does not have to be "spot on" frequency to determine the drift and the Adev.
Unless the thing is so far off as to be outside the range of your measurement
process, it would have been better to leave it alone.
It soo depends on the quality. For lesser OCXOs the daily shifts have
the frequency walk around sufficiently anyway. Still, you want the
oscillator run for quite some time for the normal termal related drift
(many sources) to settle down.
Cheers,
Magnus
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