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 counter is somewhat higher than for 
John's timestamping counter, but about a couple of orders of magnitude less 
than the final list price of a 5370B.
Bruce 

    On Thursday, 24 November 2016 9:01 PM, Anders Wallin 
<anders.e.e.wal...@gmail.com> 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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