Rohde & Schwarz FSW Series - Page 89

Configuration
R&S
®
FSW-K7
89User Manual 1173.9240.02 ─ 17
Both the electronic and the mechanical attenuation can be varied in 1 dB steps. Other
entries are rounded to the next lower integer value.
If the defined reference level cannot be set for the given attenuation, the reference
level is adjusted accordingly and the warning "Limit reached" is displayed in the status
bar.
Remote command:
INPut:EATT:STATe on page 237
INPut:EATT:AUTO on page 236
INPut:EATT on page 236
Input Settings
Some input settings affect the measured amplitude of the signal, as well.
For details see chapter 5.4.1, "Input Source Settings", on page 55.
Preamplifier (option B24) ← Input Settings
If option R&S FSW-B24 is installed, a preamplifier can be activated for the RF input
signal.
You can use a preamplifier to analyze signals from DUTs with low input power.
This function is not available for input from the Digital Baseband Interface (R&S FSW-
B17).
For R&S FSW 26 or higher models, the input signal is amplified by 30 dB if the pream-
plifier is activated.
For R&S FSW 8 or 13 models, the following settings are available:
"Off"
Deactivates the preamplifier.
"15 dB"
The RF input signal is amplified by about 15 dB.
"30 dB"
The RF input signal is amplified by about 30 dB.
Remote command:
INPut:GAIN:STATe on page 237
INPut:GAIN[:VALue] on page 237
Input Coupling ← Input Settings
The RF input of the R&S FSW can be coupled by alternating current (AC) or direct cur-
rent (DC).
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).
AC coupling blocks any DC voltage from the input signal. This is the default setting to
prevent damage to the instrument. Very low frequencies in the input signal may be dis-
torted.
However, some specifications require DC coupling. In this case, you must protect the
instrument from damaging DC input voltages manually. For details, refer to the data
sheet.
Remote command:
INPut:COUPling on page 182
Input and Frontend Settings