Charles,
I don't know the answer to that question. Since it's a thermal issue,
it's a question of how long does it take for the temperature to
stabilize? 24 hrs. should be lots of time. I'd check it before going
to bed. A quick turn-on and measure won't raise the temperature much
and will quickly show if there's a change from normal. And, as
mentioned, it takes mine about 2 hrs. to stabilize after being turned
back on.
Ed
On 12/18/2011 4:35 PM, Charles P. Steinmetz wrote:
Ed wrote:
Agreed. But it was annoying to leave it in standby mode and then
still have some drift. At first, I thought the drift was due to the
rest of the unit warming up. I was quite surprised when my tests
showed that the drift was 100% due to the oscillator. Using an FRK
as an external reference, I can turn on my 1992 (not from standby)
and immediately measure my Z3801A as 10.000 000 000 MHz.
I put one of mine in standby earlier this afternoon. I'll turn it
back on tomorrow afternoon and report the results. How long does
yours have to be in standby before it comes on 40 counts off?
Best regards,
Charles
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