Testing Equipment. Noise measuring equipment will include sound level measuring devices, which must meet Type O, or 1 specification under American National Standards Institute S1.4-1983. A loudspeaker with a directional characteristic, which at 2000 Hz the free- field radiated sound pressure, up to an angle of 45 degrees, shall not be more than 6 dB different from the on-axis sound pressure. The test signal to be emitted through the loudspeaker should be Pink Noise.
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Sources: Operational Implementation Plan, Operational Implementation Plan