Could it be that since they are much older (on average) than the
10811s, that (if they've been running) they would have much more
accumulated time, so in a more stable part of the long term drift curve?
Ed
Mark Sims wrote
Mon Jan 30 18:50:36 UTC 2012
I have had several HP-5370's with the 10544 oscillator. They
consistently have much less long term frequency drift than the
10811's. If they have not been powered on for a long time, they do
take a couple of months of power-on aging before they settle
in.
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