To Next Page

To Previous Page

116

Measuring Digital Communications Signals

Making Adjacent Channel Power (ACP) Measurements

The adjacent channel power (ACP) measurement is also referred to as the adjacent

channel power ratio (ACPR) and adjacent channel leakage ratio (ACLR). We use the

term ACP to refer to this measurement.

ACP measures the total power (rms voltage) in the specified channel and up to six

pairs of offset frequencies. The measurement result reports the ratios of the offset

powers to the main channel power.

The following example shows how to make an ACP measurement on a W-CDMA

base station signal broadcasting at 1.96 GHz. (A signal generator is used to simulate

a base station.)

Step Action Notes

1 Set up the signal

generator.

a. Set the mode to W-CDMA.

b. Set the frequency to 1.920

GHz.

c. Set the amplitude to

−10 dBm.

2 Connect the source RF

OUTPUT to the analyzer

RF INPUT as shown.

3 Select the mode. • Press Mode, Spectrum

Analyzer.

4 Preset the analyzer. • Press Mode Preset.

5 Set the analyzer radio

mode to W-CDMA as a

base station device.

a. Press Mode Setup, Radio

Std, 3GPP W-CDMA,

3GPP W-CDMA,

b. Press Mode Setup, Radio

Std Setup, Device (BTS).

Keysight N9038A Measurement Guide

Other manuals for Keysight N9038A