Instrument Functions
R&S
®
FSVA/FSV
456Operating Manual 1176.7510.02 ─ 09
●
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
and the electronic attenuation can no longer be defined individually. As soon as the
stop or center frequency is reduced below 7 GHz, this function is available again.
When the electronic attenuator is switched off, the corresponding RF attenuation mode
(auto/manual) is automatically activated.
Remote command:
INPut:EATT:AUTO on page 763
El Atten Mode (Auto/Man)
This softkey defines whether the electronic attenuator value is to be set automatically
or manually. If manual mode is selected, an edit dialog box is opened to enter the
value. This softkey is only available with option R&S FSV-B25, and only if the elec-
tronic attenuator has been activated via the El Atten On/Off 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
and the electronic attenuation can no longer be defined individually. As soon as the
stop or center frequency is reduced below 7 GHz, electronic attenuation is available
again. If the electronic attenuation was defined manually, it must be re-defined.
The attenuation can be varied in 1 dB steps from 0 to 30 dB. Other entries are rounded
to the next lower integer value.
To re-open the edit dialog box for manual value definition, select the "Man" mode
again.
If the defined reference level cannot be set for the given RF attenuation, the reference
level is adjusted accordingly and the warning "Limit reached" is output.
Remote command:
INPut:EATT:AUTO on page 763
INPut:EATT on page 763
Ref Level Offset
Opens an edit dialog box to enter the arithmetic level offset. This offset is added to the
measured level irrespective of the selected unit. The scaling of the y-axis is changed
accordingly. The setting range is ±200 dB in 0.1 dB steps.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel:OFFSet on page 751
Ref Level Position
Opens an edit dialog box to enter the reference level position, i.e. the position of the
maximum AD converter value on the level axis. The setting range is from -200 to
+200 %, 0 % corresponding to the lower and 100 % to the upper limit of the diagram.
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RPOSition on page 751
Instrument Functions - I/Q Analyzer
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