Program module "Update S-Parameters"
R&S NRP-Z5x
1137.0463.12
3.8
E-3
Structure of the uncertainty data file (square brackets indicate that the enclosed content is optional):
1. The
option line
has the following format:
# [<frequency unit>] <parameter> [<format>] [<R n>]
# identifies the
option line
.
The <frequency unit> may be Hz, kHz, MHz or GHz. If a frequency unit is not specified, GHz is
implicitly assumed.
U must be specified for <parameter> in uncertainty data files. If a parameter is not specified, S
is implicitly assumed and as a result an error message is triggered.
<format> is ignored in uncertainty measurement files; the entry is therefore irrelevant.
R is optional and followed by the reference impedance in
.
If an entry is made for R, R50 must
be specified. If no entry is made, R50 is implicitly assumed.
The
option line
should therefore read:
# [HZ | KHZ | MHZ | GHZ] U [MA | DB | RI] [R 50]
2. Measurement frequencies in ascending order are specified in the following form:
( )
[
]
( )
[
]
( )
[
]
( )
[
]
i
i
i
i
i
f
s
f
s
f
s
f
s
f
22
12
21
11
unc
unc
unc
unc
.
The s-parameters uncertainties are forwarded as follows:
•
as extended absolute uncertainties (
2
=
k
) for the magnitude of reflection parameters
11
s
and
22
s
, for instance 0.015,
•
as extended uncertainties (
2
=
k
) in dB for the magnitude of transmission parameters
21
s
and
12
s
, for instance 0.015.
3. Comments: Any line starting with an exclamation mark (!) is interpreted as a comment line.
Two additional values must be specified when the s-parameters are loaded: the lower and the upper
nominal measurement limit of the sensor-twoport combination. If s-parameter correction is active, these
values are transferred by the sensor in response to
SYSTem:INFO?
The values cannot always be
derived from the lower or upper measurement limit of the sensor alone and from the loss or gain of the
preconnected twoport. The upper measurement limit of the sensor-twoport combination may also be
limited by the twoport's maximum power-handling capacity. Furthermore, the lower measurement limit
may be raised not only by the loss but also by the inherent noise of the twoport. For this reason, these
values must be entered manually.
NOTICE
The upper nominal measurement limit of the sensor-twoport combination entered when
loading the s-parameters should be carefully specified, as automatic test systems may
evaluate it and an incorrect value may cause the sensor and/or the twoport to be
overloaded.
