This is close to the project I showed at the SF Bay Area Maker Faire
in May.
I showed fractional ppb difference measurements using a $25 flea market
scope.
The photo below is by a former NIST Cs fountain researcher who stopped by:
http://www.flickr.com/photos/oskay/4640673869/in/set-72157623988565617/
Leigh/WA5ZNU
On 07/24/2010 10:28 AM, Mark Spencer wrote:
Hello:
Just for grins I decided to compare the frquency from my GPSDO to the time base
in my 5328A counter.
I connected the 10 mhz time base from the counter to channel A of my 100 Mhz
scope, fed the 10 mhz signal from my GPSDO into Channel B and with a T adaptor
also fed this signal into the input of the counter. I scope to trigger from
Channel B.
The drift betwen the two signals on the scope seems to match the error in the
displayed frquency on the counter. (ie. if the counter shows 9999.9998 it takes
approx 5 seconds for the the wave form on channel A to slip a full cycle
realitve to channel B.)
Is this a reasonable approach or is there a better way to compare two
frequencies using a scope ?
Best regards
Mark Spencer
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