R&S FSW-K7 User Manual page 90

®
R&S FSW-K7
Automatically determines a reference level which ensures that no overload occurs at
the R&S FSW for the current input data. At the same time, the internal attenuators are
adjusted so the signal-to-noise ratio is optimized, while signal compression and clip-
ping are minimized.
To determine the required reference level, a level measurement is performed on the
R&S FSW.
If necessary, you can optimize the reference level further. Decrease the attenuation
level manually to the lowest possible value before an overload occurs, then decrease
the reference level in the same way.
When using the optional 2 GHz bandwidth extension (R&S FSW-B2000), the level
measurement is performed on the connected oscilloscope. Y-axis scaling on the oscil-
loscope is limited to a minimum of 5mV per division.
You can change the measurement time for the level measurement if necessary (see
"Changing the Automatic Measurement Time (Meastime Manual)"
Remote command:
[SENSe:]ADJust:LEVel
Mechanical Attenuation
Defines the mechanical attenuation for RF input.
This function is not available for input from the R&S Digital I/Q Interface (option
R&S FSW-B17).
Attenuation Mode / Value ← Mechanical Attenuation
The RF attenuation can be set automatically as a function of the selected reference
level (Auto mode). This ensures that no overload occurs at the RF INPUT connector
for the current reference level. It is the default setting.
By default and when no (optional)
attenuation is applied.
This function is not available for input from the optional Digital Baseband Interface.
In "Manual" mode, you can set the RF attenuation in 1 dB steps (down to 0 dB). Other
entries are rounded to the next integer value. The range is specified in the data sheet.
If the defined reference level cannot be set for the defined RF attenuation, the refer-
ence level is adjusted accordingly and the warning "Limit reached" is displayed.
NOTICE! Risk of hardware damage due to high power levels. When decreasing the
attenuation manually, ensure that the power level does not exceed the maximum level
allowed at the RF input, as an overload may lead to hardware damage.
Remote command:
INPut:ATTenuation
INPut:ATTenuation:AUTO
Using Electronic Attenuation
If the (optional) Electronic Attenuation hardware is installed on the R&S FSW, you can
also activate an electronic attenuator.
In "Auto" mode, the settings are defined automatically; in "Manual" mode, you can
define the mechanical and electronic attenuation separately.
This function is not available for input from the optional Digital Baseband Interface.
User Manual 1173.9240.02 ─ 23
on page 286
electronic attenuation
on page 245
on page 246
Configuration
Input and Frontend Settings
on page 131).
is available, mechanical
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