Modulation Analysis
R&S
®
Cable Rider ZPH
282
User Manual 1321.0950.02 ─ 07
Frequency Deviation
The vertical axis of the FM Domain displays the frequency deviation of the frequency
modulated signal.
1. Press [MEAS] key.
2. Select the "FM Domain" softkey
3. Press [SCALE/AMPT] key
4. Press the "Dev per Division".
A drop-down menu to select the step interval on the frequency deviation opens.
5. Select the step interval on the frequency deviation you require.
Scale Adjustment
The scale adjustment is only available in the "FM Domain" of "Mod Trace" measure-
ment.
1. Press [DTF/BW] key.
2. Select the "Scale Adjust" softkey.
The R&S Cable Rider ZPH performs an auto adjustment on the vertical axis in the
FM Domain of "Mod Trace" measurement.
RF Attenuation
For more information, see
Chapter 8.2.3.5, "Setting the RF Attenuation"
,
on page 218.
Preamplifier
For more information, see
Chapter 8.2.3.6, "Using the Preamplifier"
,
on page 219.
12.1.3.4
Defining Demodulation Bandwidth and Audio Lowpass Filter
Demodulation Bandwidth
The demodulation bandwidth defines the useful bandwidth used in the modulated sig-
nals.
1. Press [DTF/BW] key.
2. Select the "Manual DBW" softkey.
The R&S Cable Rider ZPH opens an input field to select the demodulation band-
width.
3. Rotate the rotary knob to select the demodulation bandwidth you require.
See
Chapter 12.1.1, "Demodulation Bandwidth"
,
on page 277 and
Table 12-2
.
Analog Demodulation
