[time-nuts] Rb vs.Crystal OCXO

Said Jackson saidjack at aol.com
Mon Apr 28 20:15:58 UTC 2014


Yeah, we have to have some undocumented commands..

The 600 is 10 minute sample intervals. The 288 is number of samples saved, so it samples 48 hours of data..

Bye,
Said

Sent From iPhone

On Apr 28, 2014, at 12:02, Hans Holzach <hans.holzach at gmail.com> wrote:

> said,
> 
> very nice, a secret command that is not mentioned in the manual! i'll play with it a bit next weekend. seems quite useful, at least to me.
> 
> hmm, i wonder what other commands there are on that misterious list... :-)
> 
> thank you,
> hans
> 
> 
> Hi Hans,
> 
> in order not to chase the tempco and aging algorithm (it will reset the
> values by itself every 10 minutes while locked to GPS as you have noted) you
> may  simply turn tempco and aging compensation off manually during your test
> period.
> 
> This can be done by the serv:tas x, yy... command. The first  parameter is
> the mode; 0 being both off, 1 being aging compensation only, and 2  being
> both aging and temperature compensation.
> 
> So the commands would be:
> 
>   serv:tas?
> 
> to query the current settings, then issuing the command:
> 
>   serv: tas 0, xx, xx ...
> 
> where xx, xx.. are the same values that were shown with the query  command.
> 
>   To re-enable the aging and tempco compensation when you  are done with
> your measurement, simply send the
> 
> 
> serv: tas 2, xx, xx ...
> 
> command using the same settings again as the query command had  returned.
> 
> Hope that helps,
> Said
> 
> 
> 
> In a message dated 4/28/2014 05:32:41 Pacific Daylight Time,
> hans.holzach at gmail.com writes:
> 
> said,
> 
> 
> 
> if i understand correctly, while  in holdover, activated by
> sync:hold:init, temperature and  aging compensation are still active
> (as it should be).  however, to measure drift, i have to somehow
> disable these  compensations, haven't i?
> 
> 
> 
> yesterday, i wrote down  the values of temperature and aging
> compensation, then set  both to 0. in holdover the software does not
> seem to  recalculate the values, at least not during the hour or two
> i  had the oscillator unlocked. on uli's Z38XX the EFC curve was
> flat, unlike when temperature and aging compensation are active (or
> not 0) during holdover. one hour or so after sync:hold:rec:init  i
> checked the values again, and they were very close to the  values
> before i reset them to 0.
> 
> 
> 
> my question is: would this be the correct procedure to have a truely
> unlocked oscillator: start holdover and then set tempco and aging  to
> 0?
> 
> 
> 
> thank you,
> 
> hans
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