3. open the machine will start to read the volume and record a variety of information to finish the set up time by measuring the time from the start, setting the work.4. bring up the volume measure (D) calculate the average sound level (TWA) workers exposed constantly to work each day (May 7, 8, 12 hours or so) is the average noise level at the time of 8 hours (8-hour TWA) for the units dBA or use results from table A2.5. the value of the calculated hours TWA8 must not exceed 90 DB a.
การแปล กรุณารอสักครู่..