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186 Chapter 9
Two-Tone Waveform Generator
Creating, Viewing, and Modifying Two-Tone Waveforms
To Change the Alignment of a Two-Tone Waveform
This procedure describes how to align a two-tone waveform left or right, relative to the center carrier
frequency. Because the frequency of one of the tones is the same as the carrier frequency, this alignment
eliminates carrier feedthrough. However, image frequency interference caused by left or right alignment
may cause minor distortion of the two-tone signal. This procedure builds upon the previous procedure.
1. On the signal generator, press
Mode Setup > Alignment Left Cent Right to Left.
2. Press
Apply Settings to regenerate the waveform.
NOTE Whenever a change is made to a setting while the two-tone generator is operating (Two Tone
Off On
set to On), you must apply the change by pressing the Apply Settings softkey before
the updated waveform will be generated. When you apply a change, the baseband generator
creates a two-tone waveform using the new settings and replaces the existing waveform in
ARB memory.
3. On the spectrum analyzer, temporarily turn off waveform averaging to refresh your view more quickly.
You should now see a left-aligned two-tone waveform that is similar to the one shown in Figure 9-5.
Figure 9-5
Upper Tone
Aligned with
Intermodulation
Distortion
Two-Tone
Channels
Carrier
Frequency
Carrier
Frequency