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Chapter 21, Spectrum Analyzer Screen
Field Descriptions
Normalize
This area performs three display operations:
• Save B saves the currently-displayed trace for the A-B operation.
• A only provides a continuously-updated display (the “normal” mode of operation).
• A-B displays the difference between the trace saved using Save B and the currently
displayed trace. The comparison can yield either losses or gains in amplitude.
Operating Considerations
The A-B function works correctly only if the center frequency and span settings
are the same for both signals.
The reference level (
Ref Level) can be changed to move the trace below the top
line of the display if the A-B function results in a gain.
The the HOLD key can be used to “freeze” the display at any time. This allows
you to view a trace before performing the Save B or A-B functions.
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