[time-nuts] Generating a solid PPS from 10Mhz source

Hal Murray hmurray at megapathdsl.net
Thu Jan 14 23:49:17 EST 2016


> My test methodology was to feed 10 MHz from one of my GPSDOs into the TIA
> reference and the same 10 MHz into the device input. I then had the TIA
> perform period measurements with a 10 second gate. The result was 1 second,
> ± maybe a dozen or two ps on average, but again, that’s where the limits of
> my TIA (Keysight 53220A) lie. 

Another approach is to use the delay option on a scope.  Trigger on your PPS, 
then look at the next one.

You probably need to do a sanity check on the scope (aka crudely calibrate) 
by looking at a known-good PPS.

-- 
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