Analog Demodulation
R&S
®
FPC
151User Manual 1178.4130.02 ─ 07
Adjusting the scale of the y-axis (AM signals)
The y-axis shows the results as a percentage that represents the modulation depth.
The modulation depth indicates how much the modulated signal deviates from the
unmodulated signal (0 %).
For AM signals, you can define the display range of the y-axis. The display range is
defined by the deviation from the zero line per grid division.
1. Press the "Ampt" key to open the amplitude menu.
2. Select the "Deviation Per Division" menu item.
3. Enter a value between 0.1 % and 100 %. (If the value you enter is not supported,
the R&S FPC round to the next supported value. If you enter 98 %, for example,
the R&S FPC uses 100 %.
You can thus define a display range from ±0.5 % to ±500 %.
Adjusting the scale of the y-axis (FM signals)
The y-axis shows how much the modulated signal deviates from the unmodulated sig-
nal (0 Hz). The unit is Hz.
For FM signals, you can define the display range of the y-axis (manually and automati-
cally). The display range is defined by the deviation from the zero line per grid division.
1. Press the "Ampt" key to open the amplitude menu.
Manual scaling of the y-axis:
2. Select the "Deviation Per Division" menu item.
3. Enter a value between 1 kHz and 1 MHz. (If the value you enter is not supported,
the R&S FPC round to the next supported value. If you enter 412 kHz, for example,
the R&S FPC uses 500 kHz.
You can thus define a display range from ±5 kHz to ±5 MHz.
Automatic scaling of the y-axis:
4. Select the "Scale Adjust" menu item.
The R&S FPC automatically scales the y-axis depending on the demodulated sig-
nal.
16.4 Bandwidth Configuration
Access: "BW"
Access (audio lowpass): "Meas" > "Audio Lowpass"
Access: "Setup" > "Config Overview" > "Bandwidth" (selected settings)
Remote commands to configure the bandwidth:
●
Chapter 19.14.4, "Bandwidth", on page 309
Bandwidth Configuration
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