[time-nuts] Basic question regarding comparing two frequencies
mspencer12345 at yahoo.ca
Sat Jul 24 14:01:29 EDT 2010
Thanks. I'll try that, with the x10 trace magnifier turned on my scope can
resolve down to 2ns per division so that should work.
----- Original Message ----
From: Bob Camp <lists at rtty.us>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Sat, July 24, 2010 10:51:21 AM
Subject: Re: [time-nuts] Basic question regarding comparing two frequencies
If you have a fast enough scope you can also use the:
Moved X ns in 10 seconds => X/10 ppb of frequency error.
On Jul 24, 2010, at 1:28 PM, Mark Spencer wrote:
> 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
> 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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