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R&S FSQ
Measurements in the Time Domain
5.28
Quick Start Guide 1313.9652.62 - 02
5.5.4 Measurement of AM-Modulated Signals
The R&S FSQ rectifies the RF input signal and displays it as a magnitude spectrum. The
rectification also demodulates AM-modulated signals. The AF voltage can be displayed in the
time domain if the modulation sidebands fall within the resolution bandwidth.
5.5.4.1 Example – Displaying the AF of an AM-Modulated Signal in the Time Domain
Test setup:
Settings on the signal generator (e.g. R&S SMIQ):
Measurement with the R&S FSQ:
1. Reset the instrument.
➢
Press the
PRESET
key.
The R&S FSQ is now in the default state.
2. Set the center frequency to 100 MHz and the span to 0 Hz.
➢
Press the
FREQ
key and enter
100 MHz
.
➢
Press the
SPAN
key and enter
0 Hz
.
3. Set the reference level to +6 dBm and the display range to linear.
➢
Press the
AMPT
key and enter
6 dBm
.
➢
Press the
RANGE LINEAR
softkey.
4. Elicit triggering in response to the AF signal by using the video trigger to produce a
static image.
➢
Press the
TRIG
key.
➢
Press the
VIDEO
softkey.
At initial activation, the video trigger level is set to 50%. The trigger level is displayed as
a horizontal line across the entire measurement diagram. R&S FSQ displays the 1 kHz
AF signal as a static image in the time domain.
Frequency:
100 MHz
Level:
0 dBm
Modulation:
50% AM, 1 kHz AF
Signal
generator
R&S FSQ
Summary of Contents for FSQ series
Page 1: ...R S FSQ Signal Analyzer Quick Start Guide Quick Start Guide Test Measurement 1313 9652 62 02 ...
Page 28: ...R S FSQ 0 4 Quick Start Guide 1313 9652 62 02 ...
Page 50: ...R S FSQ Front and Rear Panel Rear Panel Connections 1 22 Quick Start Guide 1313 9652 62 02 ...
Page 110: ...R S FSQ Basic Operation Setting Parameters 4 12 Quick Start Guide 1313 9652 62 02 ...
Page 209: ...Quick Start Guide 1313 9652 62 02 R S FSQ Appendix Appendix ...
Page 210: ...Quick Start Guide 1313 9652 62 02 R S FSQ Appendix ...
Page 220: ...R S FSQ Appendix Installing Non Plug Play Printers A 10 Quick Start Guide 1313 9652 62 02 ...