[time-nuts] Glitches in data

Hal Murray hmurray at megapathdsl.net
Thu Jul 9 00:16:48 UTC 2009


I've got an HP 5334B collecting data via a Prologix USB setup.  It's been 
running for months.

Mostly, it's doing what I expect.  But then I got 2 glitches in the last two 
days.

Here is a graph:
  http://www.megapathdsl.net/~hmurray/time-nuts/Drift-ocxo3mhz-d.gif

Here is the raw data:

It's the 2.999... column.  The second column is seconds in the day day.  They 
are 5 minutes apart.

55019 65824.624 F +2.9999996881E+06 F +3.2768070130E+04
55019 66124.710 F +2.9999996881E+06 F +3.2768070725E+04
55019 66424.796 F +2.9999996880E+06 F +3.2768071164E+04
55019 66724.882 F +2.9999997045E+06 F +3.2768071592E+04 <==
55019 67024.968 F +2.9999996878E+06 F +3.2768072178E+04
55019 67325.054 F +2.9999996878E+06 F +3.2768072586E+04
55019 67624.140 F +2.9999996880E+06 F +3.2768073011E+04
55019 67924.226 F +2.9999996881E+06 F +3.2768073466E+04

55020 61924.265 F +2.9999996883E+06 F +3.2768068930E+04
55020 62224.351 F +2.9999996884E+06 F +3.2768069393E+04
55020 62524.437 F +2.9999996882E+06 F +3.2768069919E+04
55020 62824.523 F +2.9999997030E+06 F +3.2768070314E+04  <==
55020 63124.609 F +2.9999996885E+06 F +3.2768070508E+04
55020 63424.695 F +2.9999996885E+06 F +3.2768070907E+04
55020 63724.781 F +2.9999996878E+06 F +3.2768071254E+04
55020 64024.867 F +2.9999996879E+06 F +3.2768071523E+04


Does anybody have any suggestions for what is causing things like this?  Or a 
checklist of things I should consider?

Everything is plugged into the same outlet.  The OCXO is powered by a wall 
wart.

I wasn't near it at either time.

My UPS didn't see any power glitches at either time.  (They are not running 
off the UPS.  For this, I'm just using it to monitor power.)




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