Ceyear 4051 Series, User Manual

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4. Operating Instruction
4.2 Advanced operation guide
142
Fig. 4.60 Observed FM signal spectrum without the Gate
4.2.10 Channel power
4.2.10.1 Basic concept
Measure the power and power spectral density under specified channel bandwidth. A pair of markers
displayed indicates the edges of the channel. The user can self-define the center frequency, reference level,
channel bandwidth and other parameters.
Having press
【
Measure
】
and [Channel Power], user can set relevant measurement parameters through
【
Meas Setup
】
. Suspend and restart measurement by pressing
【
Meas Control
】
or switching continuous
measurement and singular measurement.
Resolution bandwidth shall be set as 1% - 4% of channel bandwidth during the measurement of channel
power. Meanwhile, video bandwidth shall be set as over 10 times of resolution bandwidth for noise-like of
signal measured.
4.2.10.2 Measurement Example
This section mainly introduces the channel power measurements of W-CDMA(3GPP)(simulate a W-CDMA
signal by signal generator) to measure the total radio-frequency power in the channel. Measurement results
show total power (dBm) and power spectral density (dBm/Hz).
Step 1. Set signal source as below:
 Set the mode as W-CDMA.
 Set frequency on signal source to 1.960GHz.
 Set signal amplitude to -10dBm.
Step 2. Connect the radio frequency output port of the signal source to that of the analyzer. As shown in
Fig. 4.61: