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 <petervince1...@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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