Hi Hans, in order not to chase the tempco and aging algorithm (it will reset the values by itself every 10 minutes while locked to GPS as you have noted) you may simply turn tempco and aging compensation off manually during your test period. This can be done by the serv:tas x, yy... command. The first parameter is the mode; 0 being both off, 1 being aging compensation only, and 2 being both aging and temperature compensation. So the commands would be: serv:tas? to query the current settings, then issuing the command: serv: tas 0, xx, xx ... where xx, xx.. are the same values that were shown with the query command. To re-enable the aging and tempco compensation when you are done with your measurement, simply send the serv: tas 2, xx, xx ... command using the same settings again as the query command had returned. Hope that helps, Said
In a message dated 4/28/2014 05:32:41 Pacific Daylight Time, [email protected] writes: said, if i understand correctly, while in holdover, activated by sync:hold:init, temperature and aging compensation are still active (as it should be). however, to measure drift, i have to somehow disable these compensations, haven't i? yesterday, i wrote down the values of temperature and aging compensation, then set both to 0. in holdover the software does not seem to recalculate the values, at least not during the hour or two i had the oscillator unlocked. on uli's Z38XX the EFC curve was flat, unlike when temperature and aging compensation are active (or not 0) during holdover. one hour or so after sync:hold:rec:init i checked the values again, and they were very close to the values before i reset them to 0. my question is: would this be the correct procedure to have a truely unlocked oscillator: start holdover and then set tempco and aging to 0? thank you, hans Bill, There is an easier method that does not jiggle the board mechanically: The command: sync:hold:init Disables the disciplining. sync:hold:rec:init Re-enables disciplining. The sync:tint? command can be used to check the drift while in holdover.. Bye, Said _______________________________________________ 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. _______________________________________________ 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.
