R&S FSV3000 Series - Page 136

Measurements and Results
R&S
®
FSVA3000/ R&S
®
FSV3000
136User Manual 1178.8520.02 ─ 01
Figure 7-10: Measurement of the AM modulation depth
The modulation depth is displayed as "MDepth" . The frequency of the AF signal can
be obtained from the frequency display of the delta marker.
7.2.5.3 Measuring AM-Modulated Signals
The R&S FSV/A rectifies the RF input signal (that is, removes the negative parts) and
displays it as a magnitude spectrum. The rectification also demodulates AM-modulated
signals. The AF voltage can be displayed in zero span if the modulation sidebands fall
within the resolution bandwidth.
Displaying the AF of an AM-modulated signal (Zero Span)
Figure 7-11: Test setup
Table 7-5: Signal generator settings (e.g. R&S SMW)
Frequency 128 MHz
Level -30 dBm
Modulation 50 % AM, 1 kHz AF
1. Select [PRESET] to reset the instrument.
2. Set the center frequency to 128
MHz.
Basic Measurements