The characteristic that permits one receiver to be compared with another when measuring broadband signals is its impulse bandwidth. Unfortunately, not one of the current standards requires receiver impulse bandwidth measurements, partly because receivers with wide-open front ends, such as spectrum analyzers, have problems with overloads.
For additional information, refer to IEEE 376-1975 Standard for the Measurement of Impulse Strength and Impulse Bandwidth.
In the measurement of spectral intensity no averaging is used, and the result is in units per impulse bandwidth Hz.
An EMI emission measurement in units of dB above one microvolt per megahertz (dB [is greater than] [Mu] V/MHz) is an absolute amplitude measurement, However, the final result per MHz has to be computed on the basis of the measurement impulse bandwidth. Carrier-to-noise determination is a relative amplitude measurement.