Rohde & Schwarz 1145.1010.04/05/06, Руководство по эксплуатации

Страница: 179 / 813

R&S
®
ZVA/ZVB/ZVT Trace Menu
1145.1084.12 4.17 E-6
b2/a1 Src Port 1, b1/a1 Src Port 1, b2/b1 Src Port 1, b1/b2 Src Port 1
Select predefined complex ratios of the standard 2-port wave quantities a
1
, a
2
, b
1
, and b
2
:
The predefined wave quantities are all obtained with the same test set configuration, port 1 providing
the stimulus signal (source port 1, forward measurement if the stimulus signal is fed to the input of the
DUT).
•
b2/a1 Src Port 1 is the ratio of the wave quantities b
2
and a
1
and corresponds to the S-
parameter S
21
(forward transmission coefficient).
•
b1/a1 Src Port 1 is the ratio of the wave quantities b
1
and a
1
, measured at PORT 1, and
corresponds to the S-parameter S
11
(input reflection coefficient).
•
b2/b1 Src Port 1 is the ratio of the transmitted to the reflected wave quantities in a forward
measurement.
•
b1/b2 Src Port 1 is the inverse of b2/a1 Src Port 1 .
The analyzer can also measure arbitrary ratios for other source ports; see More Ratios .
Remote
control:
CALCulate<Ch>:PARameter:MEASure "<Trace_Name>", "B2/A1" | ...
[SENSe<Ch/Tr>:]FUNCtion[:ON] "...POWer:RATIO B2, A1"
etc.
Create new trace and select name and measurement parameter:
CALCulate<Ch>:PARameter:SDEFine "<Trace_Name>", "B2/A1" | ...
More Ratios
Opens a dialog to select arbitrary ratios of wave quantities, e.g. for different different detectors and
source ports or more than 2 ports. .
The notation for ratios and the functionality of the More Ratios dialog is analogous to the definition of S-
parameters.
•
Numerator selects the type (left pull-down list) and the port number assignment (right pull-down