[EMAIL PROTECTED] wrote: >> ...if my model is correct the apparent offset in the >> mean will be increased by a factor of 10 over that for a a 1 second gate >> time. >> >> Bruce >> > > > Looks like you're right Bruce. I did both 1, 0.1 and 0.01 gate times and > the error increased by a factor of 10. > > And it doesn't sound like this is a fixable in any easy sort of manner, > right? > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > Flavio
If the SR620 can do some simple arithmetic before displaying the result, then this calibration problem is easily corrected. Otherwise you will have to do the corrections on a PC (or hand held calculator). The correction will vary with time and temperature so you will need to measure it periodically. Corrected frequency = measured frequency*(nominal gate time)/(nominal gate time + differential delay). In your case the differential delay appears to be about 150 picoseconds. Bruce _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
