The measurement of sound or noise shall be made with a sound level meter meeting the standards prescribed by the American National Standards Institute. The instruments shall be maintained in calibration and good working order. A calibration check shall be made of the system at the time of any noise measurement. Measurements recorded shall be taken so as to provide a proper representation of the noise source. The microphone during the measurement shall be positioned so as not to create any unnatural enhancement or diminution of the measured voice. A windscreen for the microphone shall be used when required. The measurement shall be an A weighted or C weighted sound level.
(2011 Code, § 13.0403)