Ceyear 4051 Series, Руководство пользователя

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4. Operating Instruction
4.2 Advanced operation guide
144
Fig 4.62 Results of channel power measurement
Step 8. Change the measurement parameters:
 Press
【
Meas Setup
】
.
Users can modify measurement parameters like integration bandwidth and other as needed.
4.2.11 Occupied Bandwidth
4.2.11.1 Basic concept
Occupied Bandwidth Integration display of spectrum power, including marker setting at frequency containing
certain power part. The measurement accounts for 99% of the total measurement by default. Firstly calculate
the joint power responded by all signals in track. As for power occupying the bandwidth, 99% of power
distributed between two vertical line marker, and the rest 1% distributed out of the markers. The difference
value between the two markers is the bandwidth occupying 99% power.
Meanwhile, occupied bandwidth measurement can display the center frequency of analyzer and difference
value of center frequency in channel, which is called carrier frequency offset.
User can set measurement parameters by himself by pressing
【
Measure
】
key and selecting [Occupied BW]
menu, pressing 【 Meas Setup 】 key and enter measurement parameters setup menu, and then selecting single
or continuous measurement by pressing
【
Meas Control
】
keys.
4.2.11.2 Measurement Example
This section mainly introduces the occupied bandwidth measurements of W-CDMA(3GPP) (simulate a W-
CDMA signal by signal generator) to measure the total power in the bandwidth and calculate the bandwidth
occupied by 99% of total power.
Step 1. Set signal source as below:
 Set the mode as W-CDMA.