Warren,
On 01/20/2013 09:42 PM, WarrenS wrote:
Magnus
After you find/fix the working ones, may want to measure their Ageing
rate, room temperature Tempco, and ADEV.
Oh yes, that will be the interesting stuff once I'm past the initial
bumps that I anticipate. These are know to have "issues" so I want to do
a quick diagnosis so I would know how to proceed with each individual of
them.
Two example plots attached, one from LadyHeather using a Tbolt with the
LPRO as it's ref Osc,
the other is a TimeLab plot using a XOR phase comparator to test an
undisciplined LPRO.
To get valid ageing rate and tempco data that is good enough to measured
a correctly working LPRO,
using this Tbolt method, need to log at least three days and preferable
a week or more of data.
To measure my LPROs' ADEV which is typically ~1e-11 at 1 sec and crosses
1e-12 at ~ 200 seconds, a couple hours of data will do.
Once past the initial hurdles, looking at drift and ADEV becomes
interesting, so will phase-noise.
TimeLab's freq plot will give a great plot of the LPRO's locked warm-up
performance.
For this, depending on the time period and DUT's noise and drift rate,
I find setting the TimeLab's freq display filter from 10 to 1000 seconds
works best.
TimeLab exercises will be nice, but I hate to lock up the computer for
longer runs with the TimePod. I can use the old laptop for TI.EXE exercises.
Cheers,
Magnus
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