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If [Reset] on the front panel is pressed, the spectrum analyzer will operate again. Unless specially explained, it starts from pressing [Reset] key in the
following examples.
1 Channel power measurement
Taking the measurement of the channel power of the FM signal for example, this section describes how to apply the
channel power measurement function of S3302 series spectrum analyzer to measure the channel power of the
signal.
1) Definition of channel power
Channel power measurement of one of the most common measurements of the RF transmission system, in which
the channel power refers to the power of the signal within a certain frequency range in the specific interval. If the
specific power is not measured in the power amplifier and filter circuit test, it indicates that the system is faulty. The
channel power measurement is applied to evaluate the communication transmitter, and determine the quality of RF
transmission by comparison with the specific communication protocol.
S3302 series spectrum analyzer can be used for measuring the channel power of the FM signal. As the FM signal
is different from the CW signal in several aspects, it can be made more accurate by means of accurate setting.
2) Measurement procedures
The channel power of one FM signal can be measured with S3302 series spectrum analyzer according to the
following procedures.
a) Set the signal generator to output the FM signal:
Use the signal generator to generate one FM signal. Set the frequency as 1GHz, power as -10dBm, FM offset as
500kHz and demodulation rate as 10kHz. Connect the output of the signal generator to the RF input end of the
spectrum analyzer through one cable, as shown in Fig. 4-1. Enable the ON state of the modulation output and radio
frequency.