Receiver Mode
R&S
®
ESRP
130
User Manual 1175.7445.02 ─ 08
20
dB of the distribution. Note that the color map has to cover at least 10% of the
range of the horizontal axis.
Alternatively, you can set the range in the numeric input field. In that field, you have to
enter the distance from the right and left border as a percentage.
Example:
The color map starts at -100
dBm and ends at 0
dBm (i.e. a range of 100
dB). You,
however, want the color map to start at -90
dBm. To do so, you have to enter 10% in
the Start field. The R&S
ESRP shifts the start point 10% to the right, to -90
dBm.
In the spectrogram, cutting the range as far as possible is also a good way if you want
to observe and put the focus on signals with a certain amplitude only. Then, only those
signal amplitudes that you really want see are displayed. The rest of the display
remains dark (or light, depending on the color scheme). It is also a good way to elimi-
nate noise from the display. In the spectrogram you can do this easily by excluding the
corresponding power levels at the low end of the power level distribution.
Figure 5-2: Spectrogram that shows the peaks of a pulsed signal only
Adjusting the reference level and level range
Changing the reference level and level range also affects the color scheme in the
spectrogram.
Make sure, however, that you never adjust in a way that could overload the
R&S
ESRP.
Measurements and Result Displays
