Rohde & Schwarz FSW Series, User Manual

Page: 90 / 371

Configuration
R&S
®
FSW-K7
90 User Manual 1173.9240.02 ─ 17
Impedance ← Input Settings
The reference impedance for the measured levels of the R&S FSW can be set to 50
Ω
or 75
Ω
.
75
Ω
should be selected if the 50
Ω
input impedance is transformed to a higher impe-
dance using a 75
Ω
adapter of the RAZ type (= 25
Ω
in series to the input impedance
of the instrument). The correction value in this case is 1.76 dB = 10 log (75
Ω
/50
Ω
).
This value also affects the unit conversion (see "Reference Level" on page 86).
This function is not available for input from the Digital Baseband Interface (R&S FSW-
B17) or from the Analog Baseband Interface (R&S FSW-B71). For analog baseband
input, an impedance of 50
Ω
is always used.
Remote command:
INPut:
​
IMPedance
​
on page 183
5.4.3.2 Amplitude Settings for Analog Baseband Input
The following settings and functions are available to define amplitude settings for input
via the Analog Baseband Interface (R&S
FSW-B71) in the applications that support it.
They can be configured via the AMPT key or in the "Amplitude" tab of the "Input" dialog
box.
The input settings provided here are identical to those in the "Input Source" > "Analog
Baseband" tab, see
chapter 5.4.1.4, "Analog Baseband Input Settings" , on page 71.
For more information on the Analog Baseband Interface (R&S FSW-B71) see the
R&S FSW I/Q Analyzer and I/Q Input User Manual.
Reference Level ............................................................................................................ 91
└ Shifting the Display (Offset) ............................................................................ 91
└ Unit ..................................................................................................................91
└ Setting the Reference Level Automatically (Auto Level) .................................92
Full Scale Level Mode / Value .......................................................................................92
Input and Frontend Settings