Technical data

80 Chapter 5
Spectrum Analyzer
Measuring Multiple Signals
Spectrum Analyzer
Comparing Signals not on the Same Screen Using
Marker Delta
Measure the frequency and amplitude difference between two signals
that do not appear on the screen at one time. (This technique is useful
for harmonic distortion tests when narrow span and narrow bandwidth
are necessary to measure the low level harmonics.)
In this procedure, frequency and amplitude differences are measured
between harmonics of the analyzer’s 10 MHz reference; one harmonic
on screen and one harmonic off screen. Delta marker is used to
demonstrate this comparison.
Figure 5-5 Comparing One Signal on Screen with One Signal Off Screen
Step 1. Select the spectrum analyzer mode:
Press
Mode, Spectrum Analyzer.
Step 2.
Preset the analyzer:
Press
Mode Preset.
Step 3. Connect the rear panel REF OUT (10 MHz) to the front panel RF input.
Step 4. Set the center frequency, span and reference level to view only the
30 MHz signal:
Press
FREQ Channel, Center Frequency, 30, MHz.
Press
SPAN X Scale, Span, 5, MHz.
Step 5. Place a marker on the 30 MHz peak:
Press
Peak Search.
Step 6. Set the center frequency step size equal to 10 MHz: