[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.


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