Rohde & Schwarz EVSG1000, User Manual

Page: 113 / 311

Graphic Measurement Modes
R&S
®
EVSG1000
113 User Manual 1178.6227.02 ─ 04
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The amplitude settings configure the y-axis of the spectrum.For the AF Spectrum, the
modulation depth of the AM signal components is displayed on the y-axis.
Y-Range .......................................................................................................................113
RF Att .......................................................................................................................... 113
RF Mode ......................................................................................................................113
Y-Range
Determines the displayed modulation depth range on the y-axis of the spectrum.
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
Chapter 5.1.3.1, "RF Level and Frequency Dis-
play" , on page 45). Note that the valid level range depends on the selected measure-
ment mode.
"Manual" The RF attenuation mode is specified manually (see "RF Mode"
on page 60).
"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.
If the R&S
EVSG1000 has to adapt the attenuation frequently, indica-
ted by a frequent clicking noise from the attenuator, spikes can occur
in the trace.
Remote command:
SETATTMODE
on page 194
SCOPE_ATTMODE
on page 276
FTT_ATTMODE
on page 272
IFSPECT_ATTMODE
on page 268
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.
AF Spectrum Mode (Option R&S EVSG-K11)