[time-nuts] SRS SR620 External Source Issue -- Help Request -- A thought
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Thu Feb 22 03:48:48 UTC 2007
TheInfamousFlavio at hotmail.com wrote:
>> ...if my model is correct the apparent offset in the
>> mean will be increased by a factor of 10 over that for a a 1 second gate
>> time.
>>
>> Bruce
>>
>
>
> Looks like you're right Bruce. I did both 1, 0.1 and 0.01 gate times and
> the error increased by a factor of 10.
>
> And it doesn't sound like this is a fixable in any easy sort of manner,
> right?
>
>
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Flavio
If the SR620 can do some simple arithmetic before displaying the result,
then this calibration problem is easily corrected.
Otherwise you will have to do the corrections on a PC (or hand held
calculator).
The correction will vary with time and temperature so you will need to
measure it periodically.
Corrected frequency = measured frequency*(nominal gate time)/(nominal
gate time + differential delay).
In your case the differential delay appears to be about 150 picoseconds.
Bruce
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