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. ( 188 ) Note 1: Flat noise power is expressed in dBrn (f 1 - f 2 ) or in dBm (f 1 - f 2 ). 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.