81Measuring NoiseMeasuring Noise-Like Signals Using the Channel Power MeasurementMeasuring Noise-Like Signals Using the Channel Power MeasurementYou may want to measure the total power of a noise-like signal that occupies somebandwidth. Typically, channel power measurements are used to measure the total(channel) power in a selected bandwidth for a modulated (noise-like) signal.Alternatively, to manually calculate the channel power for a modulated signal, usethe noise marker value and add . However, if you are not certainof the characteristics of the signal, or if there are discrete spectral components in theband of interest, you can use the channel power measurement. This example uses thenoise of the analyzer, adds a discrete tone, and assumes a channel bandwidth(integration bandwidth) of 2 MHz. If desired, a specific signal may be substituted.10 log channel BW( )×Step Action Notes1 Set the analyzer to theSpectrum Analyzer mode• Press Mode, Spectrum Analyzer. This enables the spectrumanalyzer measurements.2 Preset the analyzer. • Press Mode Preset.3 Set the center frequency, • Press FREQ Channel, CenterFreq, 50, MHz.4 Start the channel powermeasurement.• Press Meas, Channel Power,5 Enable the bar graph. • Press View/Display, Bar Graph,On.6 Enable the internal50 MHz amplitudereference signal.• Press Input/Output, RFCalibrator, 50 MHz.This adds a discrete tone to seethe effects on the reading.7 Optimize the analyzerattenuation level setting.• Press AMPTD, Attenuation,Adjust Atten for Min Clip.Your display should be similarto Figure 7-6.
