Ceyear 4041 Series, User Manual

Page: 37 / 203

Chapter IV Spectrum Analyzer Mode
25
b) Set the frequency to 1 GHz, the power to -10 dBm, the frequency modulation frequency offset to 500 kHz,
the modulation rate to 10 kHz, and then connect the output of signal generator to the RF input of spectrum
analyzer with the cable, as shown in Fig 4-1, in order to generate a FM signal with the signal generator. Turn
on the modulation output switch and the RF switch.
Fig 4-1 Connection diagram of signal generator and spectrum analyzer
c) Preset the spectrum analyzer to default state:
Press
【
Preset
】
.
d) Enable the channel Power measurement function:
Press
【
Measure
】
, [Channel Power] and [Channel Pwr Off On] successively to enable the channel Power function.
e) Set the center frequency:
Press
【
Measure
】
, [Channel Power] and [Center Freq] successively, and then set the center frequency of spectrum
analyzer to the frequency of the measured signal (i.e., 1 GHz) with the numeric key.
f) Set the channel power bandwidth:
Press
【
Measure
】
, [Channel Power] and [Channel BW] successively, and then set the channel power bandwidth to
1 MHz with the numeric key.
g) Set the channel power span:
Press
【
Measure
】
, [Channel Power] and [Span] successively, and then set the channel power span to 2 MHz with
the numeric key.
h) Set the resolution bandwidth and video bandwidth of the spectrum analyzer:
Press
【
BW
】
and [Res BW Auto Man] successively, and then set the resolution bandwidth to 30 kHz;
Press
【
BW
】
and [Video BW Auto Man] successively, and then set the video bandwidth to 30 kHz or less.
The channel power bandwidth represents the frequency width in which the spectrum
analyzer displays power, while the channel power span is the frequency range in which
the spectrum analyzer scans. The set value of channel power span should not be less
than the channel power bandwidth; otherwise, the spectrum analyzer will set the
channel power span to the channel power bandwidth automatically. The channel power
Synthesized
signal generator
Spectrum Analyzer
Adapter
2.4 mm cable
Adapter
CAUTION