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Figure 2-18
Percentage of Distortion versus Harmonic Amplitude
Find the harmonic distortion (method 2)
1. Another easy way of determining the percent of distortion is to
Plot the display
1. You may want to plot the display for hard-copy documentation:
Other plotter functions let you select certain traces or parts of the
display for plotting. The
the plotter reference points to correlate to the display (DSP) or to the
display graticule (GRAT).
Chapter 2
change the units to volts:
a. Press
AMPLITUDE
marker readout automatically changes to voltage units.
b. To determine the percentage of distortion, use the ratio given by
the marker and move the decimal point of this value two places to
the right. However, the displayed ratio is limited to a minimum of
0.01, or 1 percent, before reaching zero.
a. Connect a graphics plotter (such as an Agilent 7440A ColorPro) to
the analyzer via GPIB.
b. Set the plotter address to 5.
c. On the spectrum analyzer, press
until PLT is selected.
PLT
d. Press
PLOTTER CONFIG
e. Press
to transfer the entire display to the plotter.
COPY
,
,
MORE 1 OF 3
AMPTD UNITS
CONFIG
to view available plot functions.
PLOT ORG DSP GRAT
Making Measurements
Example 4: Harmonic Distortion
,
. The
VOLTS
, then
COPY DEV PRNT
function lets you choose
71
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