Instrument Functions
R&S
®
FSVA/FSV
231Operating Manual 1176.7510.02 ─ 09
"Rel"
Relative scaling: The upper line of the grid is always at 0 dB. The
scaling is in dB whereas the reference level is always in the set unit
(for details on unit settings see the "Unit" softkey).
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:MODE on page 750
Noise Correction
If activated, the results are corrected by the instrument's inherent noise, which increa-
ses the dynamic range.
"ON"
A reference measurement of the instrument's inherent noise is carried
out. The noise power measured is then subtracted from the power in
the channel that is being examined.
The inherent noise of the instrument depends on the selected center
frequency, resolution bandwidth and level setting. Therefore, the cor-
rection function is disabled whenever one of these parameters is
changed. A disable message is displayed on the screen. Noise cor-
rection must be switched on again manually after the change.
"OFF"
No noise correction is performed.
"AUTO"
Noise correction is performed. After a parameter change, noise cor-
rection is restarted automatically and a new correction measurement
is performed.
Remote command:
[SENSe:]POWer:NCORrection on page 851
Input (AC/DC)
Toggles the RF input of the R&S FSVA/FSV between AC and DC coupling.
This function is not available for input from the R&S Digital I/Q Interface (option
R&S FSV-B17).
Remote command:
INPut:COUPling on page 760
Input 50 Ω/75 Ω
Uses 50 Ω or 75 Ω as reference impedance for the measured levels. Default setting is
50 Ω.
The setting 75 Ω should be selected if the 50 Ω input impedance is transformed to a
higher impedance 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).
All levels specified in this Operating Manual refer to the default setting of the instru-
ment (50 Ω).
This function is not available for input from the R&S Digital I/Q Interface (option
R&S FSV-B17).
Remote command:
INPut:IMPedance on page 765
Measurement Parameters
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