Ceyear 4041 Series, User Manual

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Chapter IV Spectrum Analyzer Mode
24
Section 1 Introduction to Typical Measurement
The 4041 series Spectrum Analyzer mode is the basic working mode of the product and some typical
measurement methods of this working mode, including measurement method of basic signal, the method to
improve the accuracy of frequency measurement, measurement method of small signals, the method to distinguish
signals of similar frequency and other basic measurement methods, have been introduced in "Quick Start Guide of
4041 Series Spectrum Analyzer”. In addition, this section introduces some advanced typical measurement
functions and methods for 4041 series Spectrum Analyzer mode, mainly including the followings:
a) Channel Power meter.
b) Occupied bandwidth measurement.
c) Adjacent channel Power meter.
c) Third-order intermodulation distortion measurement.
e) Drift signal measurement.
f) Noise signal measurement.
g) Distortion measurement.
h) Pulse radio frequency signal measurement.
If
【
Preset
】
key on the front panel is pressed, the spectrum analyzer will reset. Unless
otherwise specified, all the following examples are started from pressing
【
Preset
】
key.
4.1.1 Channel Power measurement
In this section, the channel Power measurement of FM signal is taken as an example to demonstrate the method to
measure the channel power of signals with the channel Power measurement function of 4041 series spectrum
analyzer.
1) Definition of channel power
The channel Power measurement is one of the most common measurements of the radio frequency transmission
system, and the channel power refers to the power transmitted by the signals within the certain frequency range
over a specific interval. In the power amplifier and filter circuit test, the system is faulty if no specific power can
be measured. The channel Power measurement may be used to evaluate the communication transmitter and to
determine the quality of radio frequency transmission by comparing it with the specific communication protocol.
The 4041 series spectrum analyzer may be used to measure the channel power of FM signal. Since the FM signal
and the CW signal differ in many respects, accurate setting will make the measured FM signal more accurate.
2) Measurement procedure
The procedure for measuring the channel power of FM signal with the 4041 series spectrum analyzer is as
follows:
a) Set the signal generator to output FM signal;
CAUTION