Note: * 1. work has been sound and the sound level of the average period of work (TWA).The standard value defined by the first table above. If there is no standard that meets the table, calculated from.The formula is as follows:
Note: 1. Time to work on getting the sound and volume average duration of work (TWA) using the standards specified in the table above as a first priority. If you do not meet the standards set schedule. Shall be calculated by the following formula:
Note * 1. Work time have been sound and average volume throughout the work (TWA), use value standard according to the above table first. If no standard on schedule, calculate from formula as follows.