[EMAIL PROTECTED] wrote: > >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
There is nothing in the hparchive site, and I don't have the Agilent ftp site url. Could you give a direct link to the 3575A manual? The basic principle is sound. It should be very easy to make a simple PWM circuit to measure phase accurately at 10MHz. You mentioned the same thing earlier. Why not post the schematic so we can take a look? Mike Monett _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
