Overview

This standard provides information on the corrections required over a range of frequencies in order for a periodic test of a sound level meter to be performed according to IEC 61672-3. These corrections include: - corrections for the typical effects of reflections from the case of the sound level meter and diffraction of sound around the microphone, - corrections for the deviation of the typical microphone frequency response from a uniform frequency response, where the actual microphone response cannot be measured, - corrections for the influence on the frequency response of a typical microphone of a specified windscreen and any other accessory that is part of the configuration for normal use of the particular sound level meter submitted for testing. In addition, this standard describes methods for determining these corrections, over the frequency range of interest, and explains the adjustment value at the calibration check frequency to be quoted by the manufacturer of the sound level meter. When the sound level meter manufacturer recommends the use of a sound calibrator, comparison coupler, or an electrostatic actuator for periodic testing of the acoustical response of a sound level meter at various frequencies, this standard describes methods of measurement of the corrections required to adjust the indication on the sound level meter to an equivalent free-field level, over the frequency range of interest. This standard includes discussion about uncertainties of measurement of the required corrections. It is intended that this standard will be used by manufacturers to determine adjustment values and corrections, by laboratories performing pattern evaluation tests according to IEC 61672-2. Laboratories performing periodic tests according to IEC 61672-3 will also need to consult this standard to ensure that the expanded uncertainties of measurement for the corrections quoted by the manufacturer do not exceed the maximum permitted values. This standard contains the German version of the European Standard EN 62585:2012. The International Standard IEC 62585:2012 which forms the basis of this European Standard has been prepared by Technical Committee 29 "Electroacoustics" of IEC (secretariat: DS, Denmark) with the German collaboration. Regarding the German collaboration Working Committee NA 001-01-03 GA (NALS/DKE A3) "Schallmessgeräte" ("Sound measuring instruments") is responsible under NALS chairmanship.

Document: references other documents

Responsible national committee

NA 001-01-03 GA - Joint working committee NALS/DKE: Sound measuring instruments