20 : Measurements with Core Uncertainty
Hello,
Allow us, please, to inform you that in the course of preparation
for the final comparison between VNA and NanoVNA, which we
planned to base it on Results with Core Uncertainties regarding
the Zinp of the "ref2007box" shown here:
(1) externally :
(2) internally :
we applied yesterday the current versions of our [REGION] &
[DERDEI] combined /F/L/O/S/S/ on the "raw" (S, L, O) + DUT
measurements, sometime taken with a HP8505A system in
CW mode under HP-IB control, from which we finally got for
the Z-inp in the the frequency range of [2,1289] MHz with step
of 13 MHz, the following graphics:
(3) R ~ f :
(4) X ~ f :
(5) Magnitude ~ f :
(6) Argument ~ f :
(7) R and X ~ f :
where, the sine qua non Core Uncertainty is due both to:
(a) the 5 = 2 + 1 + 2 uncertainties of the S, L, and O standards,
which are known from their manufacturers' data, as well as
(b) the 8 = 2 x 4 inaccuracies of the four VNA readings,
that is the Core Uncertainty is due to a combination of
26 = 13 x 2 error bounds, in total.
Sincerely,
pez&yin@arg
20
gin&pez@arg