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Spectrum analyzer
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=== Center frequency and span === In a typical spectrum analyzer there are options to set the start, stop, and center frequency. The frequency halfway between the stop and start frequencies on a spectrum analyzer display is known as the '''center frequency'''. This is the frequency that is in the middle of the display's frequency axis. '''Span''' specifies the range between the start and stop frequencies. These two parameters allow for adjustment of the display within the frequency range of the instrument to enhance visibility of the spectrum measured.
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