Chapter 2 73
Making Measurements
Example 4: Harmonic Distortion
Figure 2-19 Input Signal Displayed in a 1 MHz Span
Measure the second harmonic
1. Press
MKR, MARKER DELTA, FREQUENCY, and the step up › key. This
step retunes the spectrum analyzer center frequency to the second
harmonic.
2. Adjust the harmonic to the reference level. (Note that the
MARKER →
REF LVL function is not available in marker-delta mode.) This
displays the amplitude of the second harmonic as shown in Figure
2-20 on page 74.
Find the harmonic distortion
1. Use Figure 2-18 on page 71 to convert the difference between the
second harmonic and the fundamental to a percentage of distortion.
Again, units can be changed to volts in order to read the voltage ratio
of the two signals.
Measure additional harmonics
1. For each additional harmonic you wish to measure, press the step up
› key and adjust the reference level. Note the arrow in the upper-left
corner of the graticule indicates that the anchor marker is off-screen.
However, the results are still valid.
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