Concepts and Features
R&S
®
ZNB/ZNBT
119
User Manual 1173.9163.02 ─ 38
only ratios of the form b
i
/a
j
(ratios between outgoing and incoming waves at the DUT
ports) are considered.
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-recipro-
cal devices) do not allow a system error correction so that a complete S-parameter
measurement 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 is similar to the notation for wave quantities (see
ter 4.3.4.1, "Wave Quantities"
on page 118). Given a source port k, any ratio between
wave quantities "a
i
Src Port k" and "b
j
Src Port k" can be measured.
Examples:
●
"b
2
/a
1
Src Port 1" is the ratio of the outgoing wave at DUT port 2 and the incident
wave at DUT port 1 (i.e. DUT port 1 ist stimulated). This corresponds to the forward
transmission coefficient S
21
.
●
"b
1
/a
1
Src Port 1" is the ratio of the outgoing wave at DUT port 1 and the incident
wave at DUT port 1 (i.e. DUT port 1 ist stimulated). This corresponds to the forward
reflection coefficient S
11
.
4.3.4.3
Detector Settings
The "Detector" settings select the algorithm that is used to calculate the displayed
measurement points from the raw data. The "Detector" can be selected in the "More
Ratios" and "More Wave Quantities" dialogs.
Measurement Results
