[time-nuts] Z3801A Frequency Jump
kilodelta4foxmike at gmail.com
Wed Jan 27 19:46:21 UTC 2010
Good, I thought it may be failure time for the regulator or power supply.
I had heard folks talked about this(freq jump), but I never seen it.
I have another unit on line, so its no problem. And its the first time
I think I have seen it on that unit.
Brian - KD4FM
SAIDJACK at aol.com wrote:
> 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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