[time-nuts] Z3801A Frequency Jump

SAIDJACK at aol.com SAIDJACK at aol.com
Wed Jan 27 06:19:05 UTC 2010

Hi Brian,
This is a classical crystal jump.
Nothing one can do about it.
Could have been internal to the crystal (stress-relief) or external (gamma  
particle hitting the crystal lattice etc).
My 58503A does it every couple of days or so. Really messes with your ADEV  
In a message dated 1/26/2010 17:27:57 Pacific Standard Time,  
kilodelta4foxmike at gmail.com writes:

The  second drawing is a chart from Excel.  The Z3801A 1 PPS was being  
compared against a HP5065A rubidium and this data is the 100 second  
averages record by TAC32.  Note is shows a 200 nS jump too.  The  scale 
of the plot is in microseconds (I run a 10 uS offset for some long  term 
drift experiments).

I cannot remember what causes this from  past discussions - it may be an 
oven regulator....

Brian -  KD4FM

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