Make the adjustment in the correct sequence: 1. Set the Cal jumper to Cal Enable 2. Connect the reference to Ext Ref (rear) and Input A 3. Switch the counter to Ext Ref 4. Set the CalByte 50 for the best display (this is a very fine adjustement) 5. Switch the counter to Int Ref 6. Set the CalByte 4 for the best display (this adjustement is coarse, optimize!) 7. Set the Cal jumper to Cal Disable
After this calibration my SR620 is with the external reference +/- 3 counts (9'999'999.9997x....10'000'000,0003) previous value -210 counts with the internal reference +/- 6 counts previous value -25 counts Best regards Jürg Kögel 2009/9/28 Magnus Danielson <mag...@rubidium.dyndns.org>: > Ulrich, > > Ulrich Bangert wrote: >> >> Stan, >> >> I believe I made it with calbyte 4 as described on page 71 of the manual. > > How does that explains the shift with time-base? > > I think it is the wrong way around for a time-bias like this. Tweaking the > time-base will maybe fix it for one of the time-bases, but not for the > others. > > I'm digging deeper into this, I want to know how to fix it if I see it on > mine. > > Cheers, > Magnus > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.