3aEA7. Accuracy of pressure calibration of 1/2-in. microphones up to 20 kHz.

Session: Wednesday Morning, December 4

Time: 9:35


Author: Tasuke Takahashi
Location: Japan Quality Assurance Organization, 1-21-25, Kinuta, Setagaya-ku, Tokyo, 157 Japan
Author: Yukio Murakami
Location: Japan Quality Assurance Organization, 1-21-25, Kinuta, Setagaya-ku, Tokyo, 157 Japan
Author: Naobumi Ochiai
Location: Japan Quality Assurance Organization, 1-21-25, Kinuta, Setagaya-ku, Tokyo, 157 Japan
Author: Hajime Miura
Location: Sizuoka Inst. of Sci. and Technol., Toyosawa, Fukuroi-shi, Shizuoka, 437 Japan

Abstract:

Specifications of both laboratory standard and measurement microphones are now defined in Parts 1 and 4 of IEC 1094 ``Measurement microphones,'' respectively. Methods for the absolute pressure calibration of these microphones are also defined in Part 2 of IEC 1094. These standards were published recently. In this report 1/2-in. condenser microphones were used, such as LS2aP/LS2bP: MR112, B&K4180, and WS2P/F: various measurement microphones including those of sound level meters, have been calibrated up to 20 kHz using two couplers: plane-wave and large-volume. Calibration data are compared to each other and the accuracy of the calibrated results are discussed in detail.


ASA 132nd meeting - Hawaii, December 1996