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The calibration of sound level meter (SLM) using a coupler method has been introduced. This method utilizes a multifunction acoustic calibrator as a portable laboratory instrument. By the reason of its convenient application, it is appropriate to be realized by the secondary calibration laboratory. To complete the requirement of calibration result provided by ISO 17025, an analysis of the uncertainty measurement related to this calibration is strongly needed. Therefore, this work aims to provide an evaluation and analysis of some elements that influence to the coupler method of SLM calibration using the statistical approximation to determine the major parameters such as standard uncertainty, combine uncertainty, degree of freedom, and expanded uncertainty in accordance with The Guide to the expressions of Uncertainty in Measurement (GUM). Moreover, a case study related to this instrument calibration also discussed along this paper. From the result, the uncertainty budgets that contribute to the SLM calibration has been obtained, and generally, it is found that the standard instrument has the highest contribution to the determination of the expanded uncertainty. For the whole results, the obtained uncertainty values are still acceptable according to the acceptance limit values that required by IEC 61672-1.

A large number of industrial needs to the sound level meter (SLM) calibration has encouraged the laboratory to develop a qualified calibration system. As one of the SLM calibration methods required by the standard, the coupler method is considered as the most convenient to be implemented, especially for the secondary laboratory. Therefore, the aim of this work is to compare the SLM calibration for the frequency weighting parameter by this method using the instrument standards that comprise of a multifunction acoustic calibrator and a working standard of pressure microphone (WS2-P Microphone). Moreover, the result of frequency weighting calibration using these standards, therefore, is compared to the reference value required by IEC 61672-1. From the result, the deviation values of these standards are obtained relative to the reference. At the low to middle frequencies, the deviation values are slight relatively, while at the higher frequency, it tends to bigger. In addition, these methods also support the development system of noise dosimeter and sound level meter calibration that still under research through the scheme of Incentive Research Program for the National Innovation System in 2020.

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