[time-nuts] Counter internal resolution error

[Michael Wouters]

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.

Cheers
Michael