> 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
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