[time-nuts] New Timestamping / Time Interval Counter: the TICC
John Ackermann N8UR
jra at febo.com
Thu Nov 24 16:54:55 EST 2016
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:
> 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.
> On Thursday, November 24, 2016 09:43:54 AM John Ackermann N8UR
>> 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
>> 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
>> than are necessary, and there are other things that can surely be
>> 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
>> 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
>> 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
>>> On Wed, Nov 23, 2016 at 11:13 PM, Peter Vince
> <petervince1952 at gmail.com>
>>>> Fantastic John - well done! Yes, I'll definitely put an order in as soon
>>>> as possible.
>>>> Peter (G8ZZR, London)
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