Instrument Functions
R&S
®
FSVA/FSV
229Operating Manual 1176.7510.02 ─ 09
RF Atten Manual/Mech Att Manual
Opens an edit dialog box to enter the attenuation, irrespective of the reference level. If
electronic attenuation is activated (option R&S FSV-B25 only; "El Atten Mode Auto"
softkey), this setting defines the mechanical attenuation.
The mechanical attenuation can be set in 10 dB steps.
The RF attenuation can be set in 5 dB steps (R&S FSV with option R&S FSV-B25 or
R&S FSVA: 1 dB steps). The range is specified in the data sheet. If the current refer-
ence level cannot be set for the set RF attenuation, the reference level is adjusted
accordingly.
This function is not available for input from the R&S Digital I/Q Interface (option
R&S FSV-B17).
The RF attenuation defines the level at the input mixer according to the formula:
level
mixer
= level
input
– RF attenuation
Note: As of firmware version 1.61, the maximum mixer level allowed is 0 dBm. Mixer
levels above this value may lead to incorrect measurement results, which are indicated
by the "OVLD" status display. The increased mixer level allows for an improved signal,
but also increases the risk of overloading the instrument!
When measuring spurious emissions, using this softkey automatically opens the
"Sweep List" dialog box, see "Sweep List dialog box" on page 378.
Remote command:
INPut:ATTenuation on page 759
RF Atten Auto/Mech Att Auto
Sets the RF attenuation automatically as a function of the selected reference level.
This ensures that the optimum RF attenuation is always used. It is the default setting.
When measuring spurious emissions, using this softkey automatically opens the
"Sweep List" dialog, see "Sweep List dialog box" on page 378.
This function is not available for input from the R&S Digital I/Q Interface (option
R&S FSV-B17).
Remote command:
INPut:ATTenuation:AUTO on page 759
El Atten On/Off
This softkey switches the electronic attenuator on or off. This softkey is only available
with option R&S FSV-B25.
When the electronic attenuator is activated, the mechanical and electronic attenuation
can be defined separately. Note however, that both parts must be defined in the same
mode, i.e. either both manually, or both automatically.
This function is not available for input from the R&S Digital I/Q Interface (option
R&S FSV-B17).
●
To define the mechanical attenuation, use the RF Atten Manual/Mech Att Manual
or RF Atten Auto/Mech Att Auto softkeys.
●
To define the electronic attenuation, use the El Atten Mode (Auto/Man) softkey.
Note: This function is not available for stop frequencies (or center frequencies in zero
span) >7 GHz. In this case, the electronic and mechanical attenuation are summarized
Measurement Parameters
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