[time-nuts] Re: Counter internal resolution error

[Michael Wouters]

Thanks Demetrios, that was a very interesting read.
And thanks everyone else for responding.
Cheers
Michael

On Sat, 18 Mar 2023 at 3:02 am, Demetrios Matsakis via time-nuts <
time-nuts at lists.febo.com> wrote:

> I don’t know how SR counters are today, but when we were upgrading our
> infrastructure over a decade ago we found other counters had better
> linearity.  Rover et al’s open source article has a good discussion of
> these issues, although of course you need to have one if you are going to
> experiment.  See   G. D. Rovera, M. Siccardi, S. Romisch, and M. Abgrali,
> “Time delay measurements: estimation of the error budget”, Metrologia 56,
> 2019 035004
>
> > On Mar 17, 2023, at 9:46 AM, Magnus Danielson via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > Dear Michael,
> >
> > On 2023-03-16 08:17, Michael Wouters via time-nuts wrote:
> >> Dear time-nuts
> >>
> >> Counter specs often include an “internal resolution” error. For example,
> >> the SR620 specs say that it is 25 ps in single-shot, but this can be
> >> reduced to 4 ps with sufficient, repeated measurements. Can anyone
> offer
> >> any enlightenment as to the origin of this error, and the statistical
> >> distribution it has? I mentioned the SR620 but information about the
> 53230A
> >> would be interesting too.
> >
> > First of all, the single-shot resolution is somewhat of a hallmark
> measure when it comes to counters.
> >
> > The interpolator resolution is part of this, but consider that there
> exists non-linearities in the interpolator which makes the error larger. I
> recall there being a plot of the non-linearity in the SR620 manual.
> >
> > It is not uncommon to have interpolator resolution better than
> non-linearities, but the later may be more subtle to most.
> >
> > Averaging can help, but depending to specifics, it's hard to give a
> number.
> >
> > Cheers,
> > Magnus
> >
> >>
> >> Cheers
> >> Michael
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