[time-nuts] frequency comparator reading question

Bob Camp lists at rtty.us
Wed Feb 26 22:16:17 EST 2014


Hi

Not having one here, about all I can guess is that there are 360 degrees in a cycle. If it’s going through 360 degrees in 10 seconds it’s 0.1 Hz off at what ever point it’s comparing.  If it takes 100 seconds that’s 0.01 Hz.

Yes I get this pesky decimal point stuff wrong from time to time ...

Bob

On Feb 26, 2014, at 9:19 PM, Paul A. Cianciolo <paulc at snet.net> wrote:

> Hello,
> 
> 
> 
> I know this is really a basic question.
> 
> I have a Fluke montronics frequency comparator.
> 
> It has 2 inputs, one from my GPS and one from my DUT.
> 
> 
> 
> After a given oscillator is warmed up, I can read the meter in parts 10 -X 
> 
> There are 2 meters, One for phase 0 to 360 degrees, and one for part to the
> -nth 
> 
> In the 10-9th position on the selector switch the a given oscillator will
> show a 0 to 360 degrees travel lets say in 1 second.
> 
> 
> 
> So does that mean that the DUT is off frequency compared to the GPS input by
> 1 cycle in 1 billon?
> 
> What if it takes 10 seconds to make the 0-360 excursion?
> 
> 100 seconds?
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Paul A. Cianciolo
> 
> W1VLF
> 
> http://www.rescueelectronics.com/
> 
> Our business computer network is  powered exclusively by solar and wind
> power.
> 
> Converting Photons to Electrons for over 20 years
> 
> 
> 
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