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Making Distortion Measurements
Identifying Analyzer Generated Distortion
Figure 7-2
Harmonic Distortion
Step 6. Change the center frequency to the value of the first harmonic:
Press Peak Search, Next Peak, Mkr→CF.
Step 7. Change the span to 50 MHz and re-center the signal:
Press SPAN X Scale, Span, 50, MHz.
Press Peak Search, Mkr→CF.
Step 8. Set the attenuation to 0 dB:
Press AMPTD Y Scale, Attenuation, 0, dB.
Step 9. To determine whether the harmonic distortion products are generated by the analyzer, first
save the trace data in trace 2 as follows:
Press Trace/Detector, Select Trace, Trace 2, Clear Write.
Step 10. Allow trace 2 to update (minimum two sweeps), then store the data from trace 2 and place a
delta marker on the harmonic of trace 2:
Making Distortion Measurements
Press Trace/Detector, View/Blank, View (Update Off, Display On).
Press Peak Search, Marker Delta.
The analyzer display shows the stored data in trace 2 and the measured data in trace 1. The
ΔMkr1 amplitude reading is the difference in amplitude between the reference and active
markers.
Chapter 7
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