Concepts
MSR Measurement Concepts
The Gaussian distribution line as the band-limited gaussian noise CCDF
reference line, the user-definable reference trace, and the currently measured
trace can be displayed on a semi-log graph. If the currently measured trace is
above the user reference trace, it means that the higher peak power levels
against the average power are included in the input signal.
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Keysight N9083A & W9083A Measurement Guide