Nice work!
On the website in the introduction you mention 22ps single-shot
time-stamping on the 5370A/B.
I think it's well established that the 53230A does about 11-12 ps for
time-intervals, which corresponds to about 9 ps single-channel. see for
example:
On Wed, Nov 23, 2016 at 10:48 AM, John Ackermann N8UR wrote:
> The TICC is implemented as a two-channel timestamping counter. That means
> it can measure one or two low-frequency (e.g., pulse-per-second) inputs
> against an external 10 MHz reference, or it can do a traditional
1-2ps rms single shot noise timestamping is feasible with embedded (occurs as
part of the interpolation process) interpolator calibration. Only calibration
of the differential delay between channels is required, as is required by all
such instruments.
However the cost for such a timestamping
John
There is an application note or similar on the 53230A that indicates that
the single shot noise for time interval measurement is typically about 13ps
or so.
Bruce
On Thursday, November 24, 2016 09:43:54 AM John Ackermann N8UR
wrote:
> Hi Anders --
>
> Thanks, and thanks for the info on
On 11/24/16 6:43 AM, John Ackermann N8UR wrote:
Hi Anders --
Thanks, and thanks for the info on the 53230A. I have not used one of
those myself but the data sheet lists 20ps single-shot.
Also I should note that the TICC does not compete with counters like the
53230A for high speed
I might be able to add support to Lady Heather.Lady Heather does have code
for calculating and displaying ADEV, HDEV, MDEV, and TDEV (it came from
Timelab). Also has data logging capabilities. And can also calculate FFTs of
the data. It can already read Timelab .TIM files.
Gang,
Just a quick not to wish all of you a Happy
Thanksgiving. Thanksgiving is the best of the Holidays; a time to
give thanks for them many blessings we have and to be with those who
are most important to us. May all of your standards and time pieces agree.
Enjoy,
Burt, K6OQK
Burt I.
Thanks, Bruce, I'll update the web page to reference the 53230A as the
best resolution device currently available.
On 11/24/2016 01:03 PM, Bruce Griffiths wrote:
John
There is an application note or similar on the 53230A that indicates that
the single shot noise for time interval measurement
Hi
There *has* been a lot of research into these functions. The Frequency Control
Symposium archives have at least a few dozen papers on the why and how
of the functions working. They are now behind a paywall for me so those who have
the luxury of access will have to dig for them on their own.
Hi
> On Nov 24, 2016, at 10:49 AM, Attila Kinali wrote:
>
> On Thu, 24 Nov 2016 08:16:08 -0500
> Bob Camp wrote:
>
>> If you take the bad aging (out of spec) parts out of the pile, those are the
>> ones
>> with the best fit. They have very pretty curves and
John
Whilst its the highest resolution HP/Agilent/Keysight general purpose counter,
one of the Acquiris timestamping instruments specifies 5ps noise.Whilst no
detailed circuit schematics are publicly available, the datasheet says just
enough to allow me to figure out how they do it.Your
On 11/24/2016 5:16 AM, Bob Camp wrote:
The biggest challenge is to take out the “early stuff”. One approach is to fit
the same equation twice with the time constant restricted to a range on each.
For most OCXO’s (90%) the equation when fit early represents an upper limit
to the drift. You
Rick wrote:
The one thing I can say is that it is good to keep the crystal
ovenized at all times. Even a momentary oven outage tends to
reboot aging.
That has been my observation, as well. Same with mechanical shock and
with interruptions of oscillation (even if the oven remains
From: Mark Sims
Yes. It also works with GPSD so should be able to work with any device that
GPSD supports. It also works with most common GPS receiver native binary
languages and provides full device control.
---
Thanks, Mark. I look forward to playing with a copy. I
Given recent discussions of IoT, NTP and wall clocks, this may be of
interest
http://www.theregister.co.uk/2016/11/23/ntp_patch_time_rolls_around_again/
And the vulnerabilities:
http://www.kb.cert.org/vuls/id/633847
Clint.
===
Folks needing updates for
Hi
> On Nov 23, 2016, at 11:21 PM, Scott Stobbe wrote:
>
> Hi Lars,
>
> There are a few other pieces I have yet to fully appreciate. One of which
> is that Aln(Bt+1) isn't a time-invariant model. In the most common case
> (for the mfg) the time scale aligns with
Hi Anders --
Thanks, and thanks for the info on the 53230A. I have not used one of
those myself but the data sheet lists 20ps single-shot.
Also I should note that the TICC does not compete with counters like the
53230A for high speed measurement, or frequency counting. It does far
fewer
Thanks, Andrew. Yes, it is weird how the Arduino folks choose what
capabilities to expose on the board. From some testing I did, it seems
that the Arduino handles the 100 kHz interrupt rate without too much
strain -- it became a bigger issue at 250 kHz or above -- but the timers
would have
On Thu, 24 Nov 2016 08:16:08 -0500
Bob Camp wrote:
> If you take the bad aging (out of spec) parts out of the pile, those are the
> ones
> with the best fit. They have very pretty curves and they stick to those curves
> for a *long* time. They have a single dominant cause for
I bought these a while ago, but never got to put them in service:
Box #1: Z3811A, Rev A, w/Z3809A Cable (LUC SEC BD)
Box #2: Z3812A, Rev A (LUC PRI BD)
Boxes were opened to verify contents, but inner packing untouched.
Both for $150 (or best offer) plus shipping from 85641
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