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.
Note 1: Weightednoise power in dB is referred to 1.0 picowatt.
Use of 144 line, 144-receiver, or C-message weighting, or flatweighting, must be indicated in parentheses as required.
Note 2: With C-message weighting, a one-milliwatt, 1000-Hz tone will read +90 dBrn, but the same power as white noise, randomly distributed over a 3 kHz band will read approximately +88.5 dBrn (rounded off to +88 dBrn), because of the frequencyweighting.
Use both weights (end and center sill)) to double the Athearn 85' piggyback or all-purpose flat car's empty weight (from a stock 2.2 oz.
The center sill weights are designed to compliment the end weights but may be used alone.
Weight strips are pre-cut in small increments for precise measurement and have thin adhesive backed urethane foam tape applied to one side for easy installation.
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