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Making Basic Measurements Using Spectrum Analyzer Made
Identifying Distortion Products Using the RF Attenuator and Traces
Example: Using a signal from a signal generator, determine whether the
harmonic distortion products are generated by the spectrum analyzer.
1. Connect a signal generator to the spectrum analyzer’s INPUT 75
0.
Set the
signal generator frequency to 200 MHz and the amplitude to 0
dBm.
Set the center frequency of the spectrum analyzer to 400 MHz and the
span to 500 MHz: press [FREQUENCY), 400
IIVIHz),
ISPAN)
500 (MHz). The
signal shown in Figure 4-20 produces harmonic distortion products in the
spectrum analyzer’s input mixer.
2. Change the span to 200 MHz: press
ISPAN),
200 (MHz).
3.
Change the attenuation to 0
dB:
press
c-1,
ATTEN
AUTO MAN , 0
(dBmV).
4. To determine whether the harmonic distortion products are generated by
the spectrum analyzer, first save the screen data in trace B.
Press
Cm),
TRACE
A 3
C
(until trace B is underlined), then
CLEAR WRITE B Allow the trace to update (two sweeps) and press
VIEW
B
, [PEAK SEARCH), MARKER A The spectrum analyzer display
shows the stored data in trace B and the measured data in trace A.
5. Next, increase the RF attenuation by 10
dB:
press
(j-1,
ATTEN
AUTO MAN , and the step-up key
(m)
once. (See Figure 4-21.)
4-31