51
Functions and Measurements
Making Distortion Measurements
The signal produces harmonic products (spaced 200 MHz
from the original 200 MHz signal) in the analyzer input
mixer as shown in Figure 3-16.
4 Change the center frequency to the value of the first
harmonic:
Press > Next Peak
Press
> Mkr -> CF
5 Change the span to 50 MHz and re- center the signal:
Press > 50 > MHz
Press
Press
> Mkr -> CF
6 Set the attenuation to 0 dB:
Press > Attenuation > 0 > dB
7 To determine whether the analyzer generates harmonic
distortion products, first display the trace data in trace 2 as
follows:
Press > Select Trace > Trace 2
Press Clear Write
8 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:
Press > View
Press
Press
> Delta > Delta (On)
The analyzer display shows the stored data in trace 2 and
the measured data in trace 1. The MarkerΔ indicator reads
the difference in amplitude between the reference and active
markers.
9 Increase the RF attenuation to 10 dB:
Press > Attenuation > 10 > dB
Peak
Search
Marker
SPAN
Peak
Search
Marker
Amplitude
View/
Tra c e
View/
Tra c e
Peak
Search
Marker
Amplitude
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