Rohde & Schwarz FPL1000 Series, User Manual

Page: 420 / 899

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
420 User Manual 1178.3370.02 ─ 03
●
Auto Level
Remote command:
[SENSe:]ADJust:ALL
on page 646
Adjusting the Center Frequency Automatically ( Auto Frequency )
The R&S FPL adjusts the center frequency automatically.
The optimum center frequency is the frequency with the highest S/N ratio in the fre-
quency span. As this function uses the signal counter, it is intended for use with sinus-
oidal signals.
Remote command:
[SENSe:]ADJust:FREQuency
on page 648
Setting the Reference Level Automatically ( Auto Level )
Automatically determines a reference level which ensures that no overload occurs at
the R&S
FPL for the current input data. At the same time, the internal attenuators are
adjusted so the signal-to-noise ratio is optimized, while signal compression and clip-
ping are minimized.
To determine the required reference level, a level measurement is performed on the
R&S
FPL.
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 420).
Remote command:
[SENSe:]ADJust:LEVel
on page 648
Resetting the Automatic Measurement Time ( Meastime Auto )
Resets the measurement duration for automatic settings to the default value.
Remote command:
[SENSe:]ADJust:CONFigure[:LEVel]:DURation:MODE
on page 646
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.
Remote command:
[SENSe:]ADJust:CONFigure[:LEVel]:DURation:MODE
on page 646
[SENSe:]ADJust:CONFigure[:LEVel]:DURation
on page 646
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.
Adjusting Settings Automatically