Chapter 2 77
Making Measurements
Example 5: Third-Order Intermodulation Distortion
8. To resolve the distortion products, reduce the resolution bandwidth
until the distortion products are visible:
a. Press
BW.
b. Use the step down
⇓ key to reduce the resolution bandwidth.
9. Reduce the video bandwidth, if necessary.
10.To make sure the input signals are equal in amplitude:
a. Press
PEAK SEARCH, MARKER DELTA, and NEXT PEAK.
b. Adjust the signal source with the corresponding marker on it
until the difference in amplitude reads zero.
NOTE If you need to choose a specific resolution bandwidth to verify that the
distortion products are at a certain level below the source signal, refer
to Example 1 in this chapter.
Figure 2-22 Signals Centered on Spectrum Analyzer Display
Set the reference level
11.For greatest measurement accuracy, position the peaks of the source
signals at the reference level. The spectrum analyzer function
MARKER → REF LVL lets you set the reference level using a marker:
a. Place a marker on the source signal of highest amplitude by
pressing
PEAK SEARCH, MARKER NORMAL.
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