User guide

Adjacent Channel Power Measurement

Adjacent Channel Power measures the relative power of frequency bands adjacent

to a central channel. This is often used to identify power leakage from the center

channel into the adjacent channels. The total power in the central (main) channel is

displayed in dBm (Ch Power), and the power in the adjacent channels is displayed as

dB below and above the main channel power (Dn ACPR and Up ACPR).

Note: For best accuracy, set the central frequency so the signal is cen-

tered before taking measurements. In addition, set the span so the cen-

tral, upper, and lower channels are all shown on the screen.

Note: If a channelized band is selected from the Frequency list, these

parameters are automatically set.

1. Set the width of the central channel.

Note: The central channel can be set to a different frequency width

than the adjacent channels, but both adjacent channels have the

same width.

2. Set both adjacent channels.

3. Set the Center-to-Center channel spacing.

Note: Channel spacing is the distance from the central channel’s cen-

ter frequency to the adjacent channel’s center frequency. If there is no

guardband between channels, the channel spacing should be half

(channel width + adjacent channel width).

4. Type the desired bandwidth in each variable using the keypad, then select

the desired unit of measurement.

Note: Pressing Enter will default the Unit to MHz.

Note: All 6 markers will be used to show the edges of the central,

upper, and lower channels.