Hi
On Aug 2, 2015, at 3:18 AM, tim...@timeok.it wrote:
Hi,
For the measurement of Allan Deviation my configuration consists of a
HP53132A and TIMELAB.
I verified that the best resolution is using the universal counter as a
frequency counter.
True, but the counter “lies to you in this mode when you are doing ADEV.
Using the time interval counter with 1 PPS input is definitely has a more
precise measurement but the resolution collapses dramatically making useless
measurements on DUT with good/excellent stability.
The readings in the frequency mode are equally useless for ADEV. The frequency
estimation process is not compatible with ADEV.
I tried to use the Dual Mixer Time Difference but the Phase Wrap is very
difficult to manage during the measurements
On a reasonably stable device with a rational beat note that should not be a
problem. I suspect that either:
1) Your beat note is to low relative to the frequencies you art trying to
measure (to much gain)
-and / or-
2) Your beat note is to low relative to the stability of the devices you are
looking at (again to much gain).
Without more details it’s tough to go much further than those two suggestions.
and so I abandoned the project.
I have no specific experience but it seems to me that a good solution is the
one applied in the A7 Quartzlock, very expensive machine and hard to find
used in hobbyist prices.
I'd like to find a solution that would allow me to improve a hundred times or
more the resolution that I currently have with my setup without sacrificing
TIMELAB.
The TimePod from Symmetricom is currently the lowest cost general purpose
device I know of on the market.
The question I ask you is this: is there a solution to this problem with
features want from me with costs under 1500 dollars/euros?
I’d contact Symmetricom / Microsemi for current prices.
Bob
Luciano
timeok
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