68
Making Distortion Measurements
Third-Order Intermodulation Distortion
3 Select the mode. • Press Mode, Spectrum Analyzer.
4 Preset the analyzer. • Press Mode Preset.
5 Set the analyzer center
frequency and span.
a. Press FREQ Channel, Center
Freq, 300.5, MHz.
b. Press SPAN X Scale, Span, 5,
MHz
6 Set the analyzer detector to
Peak.
• Press Trace/Detector, Detector,
Peak.
7 Set the mixer level to
improve dynamic range.
• Press AMPTD Y Scale,
Attenuation, Max Mixer Lvl,
–10, dBm.
The analyzer automatically sets
the attenuation so that a signal
at the reference level has a
maximum value of −10 dBm at
the input mixer.
8 Move the signal to the
reference level.
• Press Peak Search, Mkr →, Mkr
→ Ref Lvl.
9 Reduce the RBW until the
distortion products are
visible.
• Press BW, Res BW, ↓.
10Activate the second
marker and place it on the
peak of the distortion
product closest to the
marker test signal.
• Press Peak Search, Marker
Delta, Next Left or Next Right
(as appropriate).
Use the Next Right key (if the
first marker is on the right test
signal) or Next Left key (if the
first marker is on the left test
signal):
11 Measure the other
distortion product
• Press Marker, Normal,
Peak Search, Next Peak.
12Activate the second
marker and place it on the
peak of the distortion
product closest to the
marked test signal.
• Press Marker, Normal, Marker
Delta, Next Left or Next Right
(as appropriate).
See Figure 6-3.
Step Action Notes
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