N5161A/62A/81A/82A/83A MXG Signal Generators User's Guide

Multitone and Two–Tone Waveforms (Option 430)Using Two–Tone Modulation8. Create a marker and place it on the peak of one of the two tones.9. Create a delta marker and place it on the peak of the adjacent intermodulation product, whichshould be spaced 10 MHz from the marked tone.10. Measure the power difference between the tone and its distortion product.You should now see a display that is similar to the one shown in Figure 12- 3 on page 300. Youroptimized two–tone signal can now be used to measure the IMD products generated by adevice–under–test.Note that carrier feedthrough changes with time and temperature. Therefore, you will need toperiodically readjust your I and Q offsets to keep your signal optimized.Figure 12-3Main MarkerMinimizedCarrierFeedthroughDelta MarkerFor details on eachkey, use key help asdescribed on page 42.Changing the Alignment of a Two–Tone WaveformThis procedure describes how to align a two–tone waveform left or right, relative to the centercarrier frequency. Because the frequency of one of the tones is the same as the carrier frequency,this alignment typically hides any carrier feedthrough. However, image frequency interference causedby left or right alignment may cause minor distortion of the two–tone signal. This procedure buildsupon the previous procedure.1. On the signal generator, press Mode > Two Tone > Alignment Left Cent Right to Left.2. Press Apply Settings to regenerate the waveform.300 Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide