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The horizontal coordinates of KC908 are on a linear scale. If the leftmost
coordinate represents 0Hz, and the rightmost coordinate represents 10GHz,
then the center is 5GHz, because people are more concerned about the center
frequency, so the center frequency (CENT, CF) and sweep width (frequency
span,SPAN) are often used to set the instrument.
The center frequency plus or minus half of the sweep width is equal to the
start (far left) and end (far right) frequencies.
The spectrometer mode can be set to a very wide SPAN, where the
spectrum is stitched together from the FFT results. Measuring and stitching
take time, and the larger the SPAN, the longer it takes to refresh a screen. Due
to the splicing, adjusting the RBW of KC908 to a large value would not
obviously speed up the refresh rate.
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