Realization of Noise Dosimeter Calibration Based on Percentage of Noise Dose Exposure using Absolute Method

The application of noise dosimeter in an industrial and construction area has shown an increase in the last decade in Indonesia significantly. The benefit of using this acoustical instrument is having a parameter known as a percentage of noise dose exposure that appropriate for the workers located in a loudness area. Moreover, the industrial necessity related to this instrument calibration quantity tends to increase in recent years. However, the calibration service related to this parameter is not available in Indonesia yet. Therefore, the aim of this work is to realize the calibration of noise dosimeters based on the percentage of noise dose exposure using an absolute method. In this method, it is necessary to apply the insert voltage technique to determine an absolute sound pressure level (SPL), where a whole measurement process is performed in a free field condition. The determined parameter is the percentage of noise dose (D), and time-weighted average (TWA) with SPL of 104 dB and 114 dB. From the result, the deviation value of D between the two devices under test and the reference tends to increase and has maximum values at the frequency of 8000 Hz that the values are 2.2% and 3.7% respectively. Meanwhile for the TWA parameter, the maximum deviation for the first DUT is found at the of 4000 Hz that has the value is 2.4 dB(A), while for the other device is about 4.1 dB(A) at the frequency of 8000 Hz. Besides, these methods are necessary to be implemented for validating the calibration of noise dosimeter using acoustic comparison coupler as a prototype research that still under development.