Common Measurement Settings
R&S
®
FSW
401
User Manual 1173.9411.02 ─ 19
For spectrograms, this value defines the position of the reference level value within the
span covered by the color map. In this case, the value is given in %, where 0
% corre-
sponds to the maximum (right end) and 100
% to the minimum (left end) of the color
map.
Remote command:
Auto Scale Once
Automatically determines the optimal range and reference level position to be dis-
played for the current measurement settings.
The display is only set once; it is not adapted further if the measurement settings are
changed again.
Remote command:
Scaling
Defines the scaling method for the y-axis.
For more information see
"Logarithmic"
Logarithmic scaling (only available for logarithmic units - dB..., and A,
V, Watt)
"Linear Unit"
Linear scaling in the unit of the measured signal
"Linear Per-
cent"
Linear scaling in percentages from 0 to 100
"Absolute"
The labeling of the level lines refers to the absolute value of the refer-
ence level (not available for "Linear Percent")
"Relative"
The scaling is in dB, relative to the reference level (only available for
logarithmic units - dB...). The upper line of the grid (reference level) is
always at 0 dB.
Remote command:
6.4.4 How to Optimize the Amplitude Display
This section gives you some advice on how to optimize the display of the measured
signal amplitudes depending on the required evaluation.
1. Perform a measurement with the default settings to get an impression of the values
to be expected.
2. Use the "Auto Level" function (AUTO menu) to optimize the reference level.
3. Use the "Auto Scale" function (AUTO menu) to optimize the scaling.
4.
To determine a precise level at a specific point in the signal:
Amplitude and Vertical Axis Configuration
