User guide

Occupied Bandwidth Measurement

Occupied Bandwidth measures the frequency band bandwidth that contains a

specified percentage of the total power of the signal.

It gives best results with single-peaked signals. Bandwidth can be defined in two

ways. Both give measurement results in Hz units.

Threshold Modes

The calculated occupied bandwidth represents the user specified percent of the

total power of the displayed span. Best for Watts power units.

dBc

The bandwidth is calculated by finding the frequencies above and below the cen-

ter or carrier frequency that is the user specified dB below the carrier level. This

method is best for measuring dBm power units.

Setting Occupied Bandwidth

Note: For the best accuracy, set the center frequency so the main or

carrier signal is centered on the screen before taking measurements.

1. Select either % or dBc under Threshold Mode.

2. Do one of the following:

 If the % Threshold has been selected, go the % soft key and set the

desired threshold via either the thumbwheel or keypad.

 If the dBc Threshold has been selected, go the dBc soft key and set the

desired threshold via either the thumbwheel or keypad.

Note: The threshold and the measured bandwidth will be displayed

in the “measurement settings” area at the bottom of the display.

Markers 1 and 2 will be turned on, and placed at the band edges.

Figure 68 Example, Occupied Bandwidth

Measurement

Settings