Occupied Bw - ADInstruments AD8000 Series Instruction Manual

AD8000 Series Spectrum Analyzer Instruction
Manual

Occupied BW

3.5
The occupied bandwidth is to mainly measure the frequency range of certain
percentage of the total power. In Channel Measurement Menu, user scan
press the 'Setting' soft-key to modify the 'Channel Spacing' and 'Occupied
Bandwidth %Power' manually. The default value of 'Channel Spacing' is
99.9%.
In Channel Measurement Menu, press the 'Occupied Bandwidth' soft-key,
and the following menu will appear
After collecting a group of data, the system would calculate the total power
of the entire span frequency, and then find out the maximum point. The
differential of the frequency of this point and the enter is the center offset.
Set the maximum point of the center, expand the range to both sides till
the range:
Totoal energy = total power x percentage of occupied BW
The found area is the occupied BW
The width with background in the figure represents the carrier bandwidth,
the height indicates the carrier power, and the center dashed is the position
of the current center offset.
Fig. 3-93 Occupied BW
103