[time-nuts] 53230A noise floor

[Anders Wallin]

Hi all,

I ran some tests on a new 53230A counter that just arrived:
http://www.anderswallin.net/2015/04/keysight-53230a-noise-floor-test/

The time-interval single-shot noise and resulting ADEV seems easy enough to
explain.

I didn't yet have time to look closely at Enrico Rubiola's notes over here:
http://rubiola.org/pdf-slides/2012T-IFCS-Counters.pdf
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.

on another note:
The discussion on phase-noise <-> ADEV calculations earlier was
interesting. Datasets (synthetic or real) with known correct ADEVs and
phase-noise-spectra would be a good addition to allantools and a motivation
to add code for the phase-noise <-> ADEV conversion.

cheers,
Anders