[time-nuts] Temex LPFRS-01 analog frequency adjustement

Magnus Danielson magnus at rubidium.dyndns.org
Mon Mar 7 17:43:47 UTC 2011


On 03/07/2011 05:52 PM, Mark Spencer wrote:
> Greetings.  I'm wondering if any one has any insight (or wishes to speculate) as
> to how the external analog frequency adjustment on a Temex LPFRS-01 Rubidium
> standard functions.
>
>
>  From experimenting with one over the last few days there seems to be a step
> function to the adjustment.   I'm wondering if frequency adjustment voltage is
> read by an  ADC which is monitored by the CPU which adjusts the frequency ?
> (Or perhaps I'm just not adjusting the multi turn trimmer properly.)

There is a CPU in there with ADC and DACs. You also have serial 
interface to it, so you could hook it up to RS-232. Don't recall from 
the top of my head if the levels is RS-232 or CMOS, but I can check... 
as I have one.

Cheers,
Magnus




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