VNA GUI reference
R&S
®
ZNL/ZNLE
403User Manual 1178.5966.02 ─ 20
The "More Ratios..." button opens the More Ratios dialog which allows to select an
arbitrary ratio of wave quantities.
b<i> / a<j> Source Port <j>
Selects predefined complex ratios of the standard 2-port wave quantities a
1
, a
2
, b
1
, and
b
2
.
The predefined wave quantities can all be obtained with the same test setup, where a
2-port DUT is connected between the analyzer ports 1 and 2. The stimulus signal is
provided by the analyzer port 1 or 2 ("Source Port").
The predefined wave quantities correspond to the 2-port S-parameters:
●
"b1/a1 Source Port 1" is the ratio of the wave quantities b
1
and a
1
, measured at
port 1. This ratio corresponds to the S-parameter S
11
(input reflection coefficient).
●
"b2/a1 Source 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).
●
"b2/a2 Source Port 2" is the ratio of the wave quantities b
2
and a
2
, measured at
port 2. This ratio corresponds to the S-parameter S
22
(output reflection coefficient).
●
"b1/a2 Source Port 2" is the ratio of the wave quantities b
1
and a
2
and corresponds
to the S-parameter S
12
(reverse transmission coefficient).
The analyzer can also measure arbitrary ratios for other source ports; see Chap-
ter 10.7.2.2, "More Ratios dialog", on page 403.
Tip: In the trace list, the source port is indicated in brackets. "b2/a1(P1)" denotes the
ratio b
2
/a
1
with source port 1.
Remote command:
CALCulate<Ch>:PARameter:MEASure "<Trace_Name>", "B2/A1" | ...
CALCulate<Ch>:PARameter:SDEFine "<Trace_Name>", "B2/A1" | ...
10.7.2.2 More Ratios dialog
The More Ratios dialog allows you to select arbitrary ratios between wave quantities b
i
,
a
j
as measured quantity. The ratios can be calculated with arbitrary source port and dif-
ferent detector settings.
Access: [Meas] > "Ratios" > "More Ratios..."
Meas softtool
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