Dr Bruce Griffiths wrote: > [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 > > Bruce/Flavio,
Could that be mostly corrected (at constant temperature) by inserting the proper delay at the right place (in the form of a short piece of coax cable)? It seems that the error could be easily reduced by a factor of 10. Didier _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts