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Chapter 1 61
Making Basic Measurements
Demodulating AM Signals (Using the Analyzer As a Fixed Tuned Receiver)
6. Select zero span by either pressing SPAN, 0, Hz; or pressing SPAN,
Zero Span. See Figure 1-51.
7. Change the sweep time to 5 ms by pressing Sweep,
Sweep Time (Man), 5, ms.
8. Since the modulation is a steady tone, you can use video trigger to
trigger the analyzer sweep on the waveform and stabilize the trace,
much like an oscilloscope by pressing
Trig, Video, and adjusting the
trigger level with the front-panel knob until the signal stabilizes. See
Figure 1-52.
If you are viewing an off-the-air signal you will not be able to
stabilize the waveform.
NOTE If the Trigger Level is set too high or too low when this trigger mode is
activated, the sweep will stop. You will need to adjust the trigger level
up or down with the front-panel knob until the sweep begins again.
Figure 1-51 Measuring Modulation In Zero Span