[time-nuts] GPSDO PU question

Joseph Gray jgray at zianet.com
Wed Sep 30 00:32:16 UTC 2009

Yesterday, the PU on my Z3801A suddenly jumped from 2.9uS (where it
had stabilized) up to 4.2uS. This was an instantaneous jump. the PU
stayed there for a few hours and then started gradually decreasing
again. about 20 hours after the jump, the PU is only down to 3.9uS.
This Z3801A was powered up five days ago after about three years of
storage. I'm showing my ignorance, but would someone explain why this
jump would happen?


Joe Gray

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