A Model 700 Sound Level Meter/Dosimeter was modified to reflect the proposed frequency weighting curve for infrasound. With this system, the exact time and duration of any infrasound levels that exceed the threshold of hearing are recorded. The average level (Leq) of each event as well as the overall Leq are also provided. In addition a dose, based tentatively on 110 dB at 20 Hz for 8 hours, is also available. Preliminary results from the use of this instrument are presented and discussed.
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