Hello,

Allow us, please, to summarize briefly:

(0) The measurement uncertainty is error-bounds of the

measurement.

(1) If a measurement does not involve mathematical expressions

then someone can choose the statistical way he likes to

mathematically estimate|compute a subjective uncertainty .

(2) If a measurement involves known mathematical expressions

then either there is or there is not -up to now- a known, unique,

mathematical way, that is a way solely based on these

mathematical expressions alone, to estimate|compute an

objective uncertainty.

(3) A vna measurement involves known mathematical expressions

and after more than ten 10 years there are now five 5 known

mathematical ways to estimate|compute a unique objective

uncertainty, each one for each of the five 5 "error" models considered

(by intermediately estimate|compute the errors of these "errors"),

as well as new one(s), the sixth 6th (or more), shall be added

as soon as the "error" model(s) of the NanoVNA will be revealed.

(4) These "errors" of "error" models are just historical names of

parameters mathematically expressed in terms to what is widely

known today collectively as "S-parameters" and thus these are

not error bounds - they are not uncertainties of the measurement.

Sincerely,

yin&pez@arg

6