Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

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:

Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

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

Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

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

Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

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

Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

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

[time-nuts] New Timestamping / Time Interval Counter: the TICC

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.

[time-nuts] Happy Thanksgiving...

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.

Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

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

Re: [time-nuts] crystal againg fit (was: Excel logarithmic function)

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.

Re: [time-nuts] crystal againg fit (was: Excel logarithmic function)

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

Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

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

Re: [time-nuts] Excel logarithmic function (was Thermal impact on OCXO)

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

Re: [time-nuts] Excel logarithmic function

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

Re: [time-nuts] How can I measure GPS Antenna quality?

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

Re: [time-nuts] Time, NTD, IoT and bug fixes

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

Re: [time-nuts] Excel logarithmic function (was Thermal impact on OCXO)

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

Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

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

Re: [time-nuts] New Timestamping / Time Interval Counter: the TICC

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

[time-nuts] crystal againg fit (was: Excel logarithmic function)

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

[time-nuts] SYMMETRICON GPS Package For Sale

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