[time-nuts] [Fwd: Re: What is the best counter for a Time Nuts?]
hasweb at has.org.nz
hasweb at has.org.nz
Mon Oct 13 19:40:59 UTC 2008
Mike Monett wrote:
> > So, assuming my known timebase is "bang on", I know the frequency
> > of the unknown 10 MHz source to an accuracy of roughly 3e-10 or 3
> > parts in 10 billion.
>
> > To get a more precise measurement of the frequency difference
> > between the two 10 MHz clocks, I supply the known 10 MHz clock to
> > the Channel A input of an HP 3575A Gain-Phase meter and the
> > unknown 10 MHz clock to the channel B input of the Gain-Phase
> > meter.
>
> Another very difficult instrument to find any data on. The best I
> could find shows it has an accuracy of ± 0.5 degree and resolution
> of 0.1 degree.
>
Try the agilent website for the manuals not yet readily available
For directions visit:
www.hparchive.com <http://www.hparchive.com>
There is a 3575A manual for downloading at the Agilent ftp link.
If you read it you will find that the specified error with 10MHz
inputs is much larger: 10-20 degrees or so.
Bruce
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