I've just been playing with my new (ex demo) fca3100 and the results seem
dependent on setup.
(I'm not trying to hijack the thread from the 53230A but I think it is useful
to have comparison results - I know I would have liked to see some prior to
buying my counter.)
I have found that if I turn
Hi
If you use the same sort of small step synthesizer approach and get very close
(but not equal to) the reference, you
can find “dead spots” where the resolution is not as good as you expected it to
be. You need to be able to
step off in 1x10^-11 steps to do a good job of plotting it. Sweeping
>
>
> See the part the end that shows why averaging breaks ADEV:
> http://leapsecond.com/pages/adev-avg/
>
Hi Tom, thanks for reminding me of that page. I did no averaging of the
data myself, and I think it's logical that the counter noise floor goes
down with increasing gate time - I just hav
Anders,
On 04/03/2015 11:49 AM, Anders Wallin wrote:
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
The standard deviation is good and consistent with others measurements which
seem to be in the range 10 to 15 psecs.
I think the channel skew is one half of 112psecs = 56 psecs (as it adds one way
and subtracts the other) and this is close to the Keysight datasheet claim of
50 psecs typically.
In message
, Anders Wallin writes:
>I ran some tests on a new 53230A counter that just arrived:
>http://www.anderswallin.net/2015/04/keysight-53230a-noise-floor-test/
Anders,
I think that setup didn't measure what you think.
When you feed the counter EXT REF from the same source you m
> 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://lea
Jim,
On 03/28/2015 10:01 PM, Jim Lux wrote:
On 3/28/15 10:27 AM, Bob Camp wrote:
Hi
So If the rocket continuously accelerates at 10,000 G’s, you will get
a 20 ppm shift
with typical sensitivity. If you do this for very long, you will also
get into time dilation issues.
(you hit 0.1C in <
Hi
You may want to take a look at some of Bill Riley’s (and others) papers on how
pre-filtering
can lead to errors in an ADEV calculation.
Simply put - the frequency mode is a filter and it is not the right one to have
in front of an ADEV
calculation.
Bob
> On Apr 3, 2015, at 5:49 AM, Ander
Remember that you can actually let each base-station transmit at a
different code, and you can then monitor them that way. You could even
keep them frequency and phase locked or just monitor it and adjust it in
the post-processing. Such an approach would be a nice complementary
solution to the
Remember, that if you have 4 receivers you get X, Y, Z and T of the
source, and in this case T will be the phase-drift of the rocket. So, if
logged with sufficient precision, the stability of the on-board clock
may not become as important as the fact that it is there and has
reasonably good pha
Hi,
On 03/26/2015 01:25 PM, Attila Kinali wrote:
On Wed, 25 Mar 2015 21:27:35 -0500
Robert Watzlavick wrote:
I'm working on a project that I could use some advice on and also might
be of interest to the list. If it's not appropriate for the list, my
apologies.
The gods have apporved of yo
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 her
There is evidence that the ear can discern differences in timing down to
the uS range. See a discussion by David Blackmer of DBX and Earthworks:
http://www.earthworksaudio.com/wp-content/uploads/2012/07/The-world-beyond-20kHz.pdf
David McGaw
On 4/1/15 7:11 PM, Chris Albertson wrote:
The key
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