Concepts and Features
R&S
®
ZNC
51
User Manual 1173.9557.02 ─ 13
Examples for using ratios
A measurement of ratios is particularly suitable for the following test scenarios:
●
The test setup or some of its components (e.g. active components or non-reciprocal
devices) do not allow a system error correction so that a complete S-parameter mea-
surement is not possible.
●
The test setup contains frequency-converting components so that the transmitted and
the received waves are at different frequencies.
●
A ratio of two arbitrary waves that is not an element of the S-matrix (e.g. a ratio of the
form a
i
/a
j
) is needed.
The notation for ratios includes the two waves with their directions and test port numbers.
Additionally, the source port must be specified. In analogy to wave quantities, the letter
a indicates an outgoing wave, b an incoming wave.
Examples:
●
b
2
/a
1
Src Port 1 is the ratio of the outgoing wave b
2
at port 2 and the incident wave
a
1
at port 1; this corresponds to the S-parameter S
21
(forward transmission coeffi-
cient).
●
b
1
/a
1
Src Port 1 is the ratio of the wave quantities b
1
and a
1
, measured at PORT 1;
this corresponds to the S-parameter S
11
(input reflection coefficient).
3.3.4.3
Detector Settings
The "Detector" settings select the algorithm that is used to calculate the displayed mea-
surement points from the raw data. The "Detector" can be selected in the "More
Ratios" and "More Wave Quantities" dialogs.
The following detectors are available:
●
Normal
selects the default detector mode where each measurement point is dis-
played without modification as soon as it is recognized to be valid. The analyzer then
proceeds to the next sweep point. Normal detector mode ensures that the measure-
ment is performed at maximum speed and that a meaningful complex result is
obtained.
Measurement Results
