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Figure 6-77. Combined Eects of Amplitude and Phase Modulation Using the demodulation capabilities of the analyzer, it is possible to view the amplitude or the phase component of the modulation separately. The window menu includes the following softkeys to control the demodulation feature: is the normal preset state, in which both the amplitude and phase components DEMOD: OFF of any test device modulation appear on the display. displays only the amplitude modulation, as illustrated in Figure 6-78a. AMPLITUDE NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNNNNNNNNNNNNN PHASE displays only the phase modulation, as shown in Figure 6-78b. Figure 6-78. Separating the Amplitude and Phase Components of Test-Device-Induced Modulation Forward transform range. In the forward transform (from CW time to the frequency domain), range is dened as the frequency span that can be displayed before aliasing occurs, and is similar to range as dened for time domain measurements. In the range formula, substitute time span for frequency span. Example: 6-136 Application and Operation Concepts
