[time-nuts] LPRO 101 ADJUSTMENT

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jul 26 00:43:20 UTC 2008


jshank wrote:
> If I choose to control the frequency via External C-field control I guess it 
> would take a very precise and stable voltage source.  Any thoughts or 
> suggestions?
>   
1) Quantify quiet and stable. Otherwise you'll either get suggestions 
that are inexpensive with inadequate stability or suggestions that are 
expensive and have more stability and lower noise than is actually required.

One method is to use a stable quiet and slow ADC to measure the output 
of a DAC system that is sufficiently quiet with good short term 
stability and adjust the DAC output to the desired value using the ADC 
to detect when this is achieved.

Bruce




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