R&S FSW Series, Руководство пользователя

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Common Measurement Settings
R&S
®
FSW
499 User Manual 1173.9411.02 ─ 43
Remote command:
[SENSe:]ADJust:FREQuency
on page 1066
Setting the Reference Level Automatically (Auto Level)
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 and
the preamplifier (for analog baseband input: the full scale level) are adjusted so the sig-
nal-to-noise ratio is optimized, while signal compression and clipping 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.
You can change the measurement time for the level measurement if necessary (see
"Changing the Automatic Measurement Time (Meastime Manual)" on page 499).
Remote command:
[SENSe:]ADJust:LEVel
on page 1067
Resetting the Automatic Measurement Time (Meastime Auto)
Resets the measurement duration for automatic settings to the default value.
(Spectrum application: 1 ms)
Remote command:
[SENSe:]ADJust:CONFigure:DURation:MODE
on page 1065
Changing the Automatic Measurement Time (Meastime Manual)
This function allows you to change the measurement duration for automatic setting
adjustments. Enter the value in seconds.
Note: The maximum possible measurement duration depends on the currently
selected measurement and the installed (optional) hardware. Thus, the measurement
duration actually used to determine the automatic settings may be shorter than the
value you define here.
Remote command:
[SENSe:]ADJust:CONFigure:DURation:MODE
on page 1065
[SENSe:]ADJust:CONFigure:DURation
on page 1065
Upper Level Hysteresis
When the reference level is adjusted automatically using the Auto Level function, the
internal attenuators and the preamplifier are also adjusted. To avoid frequent adapta-
tion due to small changes in the input signal, you can define a hysteresis. This setting
defines an upper threshold the signal must exceed (compared to the last measure-
ment) before the reference level is adapted automatically.
Remote command:
[SENSe:]ADJust:CONFigure:HYSTeresis:UPPer
on page 1066
Adjusting Settings Automatically