Flat weighting
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Flat weighting: In a noise-measuring set, a noise weighting based on an amplitude-frequency characteristic that is flat over a frequency range that must be stated.
Note 1: Flat noise power is expressed in dBrn (f1 - f2) or in dBm (f1 - f2). Note 2: "3 kHz flat weighting" and "15 kHz flat weighting" are based on amplitude-frequency characteristics that are flat between 30 Hz and the frequency indicated.
Source: from Federal Standard 1037C and from MIL-STD-188