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

Bruce Griffiths bruce.griffiths at xtra.co.nz
Thu Nov 24 13:03:42 EST 2016


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 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 measurements per second than the high-end counters -- my 
design
> criteria was for use in PPS measuring system.
> 
> With the current software, the actual measurement processing time is
> about 1 millisecond; we may be able to optimize a hundred or two
> microseconds from that as the code currently has more 64 bit 
operations
> than are necessary, and there are other things that can surely be 
tweaked.
> 
> The killer is the serial output via USB.  It can take up to 10 ms to
> output 20 characters, and that's what really limits the measurement
> rate.  I'm pretty sure this can be improved (one idea is to buffer
> results to reduce USB packetization delays), but there's other
> functionality that I need to finish first.
> 
> BTW -- the software is open source and on github at
> https://github.com/TAPR/TICC , so I welcome anyone who wants to work 
on
> it.  Bug fixes are gladly accepted, and if you're looking for work to
> do, I could use a volunteer to work on a couple of areas, most
> critically finishing a UI that will allow the user to set operating
> parameters.
> 
> John
> ----
> 
> On 11/24/2016 02:40 AM, Anders Wallin wrote:
> > 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:
> > http://www.anderswallin.net/wp-content/uploads/2015/04/53230A_PPS_skew.png
> > 
> > Anders
> > 
> > 
> > On Wed, Nov 23, 2016 at 11:13 PM, Peter Vince 
<petervince1952 at gmail.com>
> > 
> > wrote:
> >> Fantastic John - well done!  Yes, I'll definitely put an order in as soon
> >> as possible.
> >> 
> >>       Regards,
> >>       
> >>           Peter  (G8ZZR, London)
> >> 
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