Rohde & Schwarz EVSG-B1, User Manual

Page: 147 / 418

Graphic Measurement Modes
R&S
®
EVSG1000
147 User Manual 1178.6227.02 ─ 06
Ref Level
The reference level determines the maximum power level displayed in the spectrum.
The reference level should be set as close as possible to the highest expected power
level to avoid overload at the RF input or signal clipping.
Remote command:
IFSPECT_REFLEVEL
on page 357
Y-Range
Determines the displayed power level range on the y-axis of the spectrum. The range
starts at the specified
Ref Level at the top of the diagram.
RF Att
Determines how the attenuation of the RF signal is defined. The attenuation should be
adjusted such that the measured power level remains in the valid level range (indicated
by the green area of the bargraph, see
Figure 4-4 ). Note that the valid level range
depends on the selected measurement mode.
"Manual" The RF attenuation mode is specified manually (see "RF Mode"
on page 81).
"Auto" The RF attenuation mode is selected automatically.
The signal attenuation is selected automatically according to the sig-
nal strength.
This mode works best with clean signals. In difficult receiving condi-
tions, the "Low Noise", "Normal" or "Low Distortion" modes can be
more stable.
When monitoring signals with mostly constant signal levels, it is also
recommended that you use the "Low Noise", "Normal" or "Low Distor-
tion" mode.
Remote command:
SETATTMODE
on page 246
SCOPE_ATTMODE
on page 368
FFT_ATTMODE
on page 360
IFSPECT_ATTMODE
on page 356
RF Mode
Defines the RF attenuation mode to be used.
"Low Noise" 15 dB pre-amplification
Provides a high sensitivity. Suitable when scanning the area for dis-
tant signals.
"Norm" 0 dB
Provides a normal sensitivity.
"Low Dist" 15 dB attenuation
Provides a low sensitivity. Suitable when analyzing a nearby signal, to
avoid overload due to high-level signals.
Remote command:
SETATTMODE
on page 246
FSCAN_ATTMODE
on page 351
SCOPE_ATTMODE
on page 368
IF Spectrum Mode (Option R&S EVSG-K10)