Configuration
R&S
®
VSE-K149
31
User Manual 1179.3315.02 ─ 01
Shifting the Display ( Offset ) ← Reference Level
Defines an arithmetic level offset. This offset is added to the measured level. In some
result displays, the scaling of the y-axis is changed accordingly.
Define an offset if the signal is attenuated or amplified before it is fed into the R&S
VSE
so the application shows correct power results. All displayed power level results are
shifted by this value.
The setting range is ±200 dB in 0.01 dB steps.
Note, however, that the
internal
reference level (used to adjust the hardware settings to
the expected signal) ignores any "Reference Level Offset" . Thus, it is important to
keep in mind the actual power level the R&S
VSE must handle. Do not rely on the dis-
played reference level (internal reference level = displayed reference level - offset).
Remote command:
DISPlay[:WINDow<n>]:TRACe<t>:Y[:SCALe]:RLEVel<ant>:OFFSet
RF Attenuation
Defines the mechanical attenuation for RF input.
Attenuation Mode / Value ← RF 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.
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:
Using Electronic Attenuation
If the (optional) Electronic Attenuation hardware is installed on the connected instru-
ment, 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.
For an active external frontend, electronic attenuation is not available.
Note:
Note that restrictions may apply concerning which frequencies electronic attenu-
ation is available for, depending on which instrument is connected to the R&S
VSE
software. Check your instrument documentation for details.
In "Auto" mode, RF attenuation is provided by the electronic attenuator as much as
possible to reduce the amount of mechanical switching required. Mechanical attenua-
tion may provide a better signal-to-noise ratio, however.
Input and Frontend Settings
