Tangetially relevant; I made a "patch" for TimeLab to use the gap-free frequency measurement-mode for the 53230A, if anyone is interested.
On Fri, Apr 3, 2015 at 4:34 PM, Tom Van Baak <t...@leapsecond.com> wrote: > > There is probably a good explanation for the ADEV-level in standard > > (pi-counting?) reciprocal frequency counter mode as well as the roughly > > 1/sqrt(10) enhancement in ADEV when increasing the gate-time 10-fold. > > Anders, > > See the part the end that shows why averaging breaks ADEV: > http://leapsecond.com/pages/adev-avg/ > > > I collected the data with a simple program that just calls the "READ?" > function > > repeatedly, which does result in some dead-time between measurements. > > Yes, that's the easy way. But for more valid results use gap-free > continuous mode (SENS:FREQ:MODE CONT). From the manual: > > "CONTinuous configures the instrument to make continuous > resolution-enhanced, gap-free measurements. This mode should be selected > for true Allan deviation computation (CALCulate:AVERage subsystem). In > this mode, all samples for a each trigger are started by a single gate open > (instead of gate open/close per sample), and the measurements are computed > back-to-back with no dead time. CONTinuous can only be used for frequency > and average period measurements. Available only on the Agilent 53230A." > > /tvb > _______________________________________________ > 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.