[time-nuts] More graphs: OCXO step, holdover recovery

[Bob Camp]

Hi

The 5334B event is commonly called a frequency jump. There is a fairly famous
HP paper on testing for them that invokes the phrase “test to destruction” (if I remember
correctly). They are seen in all OCXO’s if you watch enough parts long enough. They tend to increase
in time between jumps as the unit runs. Put another way, after a long time power on, you 
will not see them. The first publication I saw them graphically documented in was a 
semiconductor app note from the 1960’s.

Bob



> On Apr 26, 2016, at 6:31 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
> An interesting step in the OCXO
>  http://users.megapathdsl.net/~hmurray/time-nuts/HP-5334B-step-2016-Apr-23.pn
> g
> 
> This is a from second HP5334B that has been running for months so the offset 
> will be different.
> 
> 
> This is KS-24361 recovering from two holdover events of 12 or 13 minutes each:
>  http://users.megapathdsl.net/~hmurray/time-nuts/GPSDO/KS-volt-2016-Apr-25.pn
> g
>  http://users.megapathdsl.net/~hmurray/time-nuts/GPSDO/KS-freq-2016-Apr-25.pn
> g
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
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