Electroacoustics - Methods to determine corrections to obtain the free-field response of a sound level meter (IEC 29/723/CDV:2010); German version prEN 62585:2010
Project begin
2010-09-07
Planned document number
DIN EN 62585
Abstract
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 if the sound level meter is submitted for periodic testing with these items.
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 International 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.
Responsible Committee
NA 001-01-03 GA Gemeinschaftsarbeitsausschuss NALS/DKE: Schallmessgeräte
Draft standard