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

[jimlux]

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 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.

2000 bytes/second

A "arduino compatible" processor might help.. The teensy easily pumps 6 
kbytes/second over USB in 64 byte chunks - but the Freescale processor 
has a hardware USB buffer thing.





>
> 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)
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/
>>> mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.