[time-nuts] SRS SR620 External Source Issue -- Help Request
TheInfamousFlavio at hotmail.com
TheInfamousFlavio at hotmail.com
Wed Feb 21 18:13:08 EST 2007
I've done the self calibration. Nothing changes. I've let everything
warm-up and checked both channels A and B, same thing. I've swapped the
cables on the front and the back, same thing. I've tried a T-connector on
the ref input with 50ohm termination, same thing.
The readings are pretty stable, they are just offset by -0.0015 Hz.
----- Original Message -----
From: "Brooke Clarke" <brooke at pacific.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Wednesday, February 21, 2007 18:04
Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request
> Hi Flavio:
>
> Have you tried using averaging? The right most digits are from an
> interpolator and if you check the manual the displayed resolution is
> much greater than the accuracy, but if you average say 1,000 readings
> then those digits get much better. Also have you done the self
> calibration?
>
> Have Fun,
>
> Brooke Clarke
>
> w/Java http://www.PRC68.com
> w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
> http://www.precisionclock.com
>
>
>
> TheInfamousFlavio at hotmail.com wrote:
>
>>I have an SR620 counter that I set up with a Z3801A as an external
>>reference. If I put a bnc T connector at the output of the Z3801A and use
>>two equal length bnc cables, one to the ext. ref input on the back and the
>>other to channel A then do a frequency measurement, I get a mean that is
>>about .0015 Hz below 10,000,000.0000Hz.
>>
>>Does any know why this might be happening? I would expect it to read
>>10,000,000.0000 exactly give or take a couple on the last digit.
>>
>>_______________________________________________
>>time-nuts mailing list
>>time-nuts at febo.com
>>https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>
>>
>>
>
> _______________________________________________
> time-nuts mailing list
> time-nuts at febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
More information about the time-nuts
mailing list