AS/NZS 2399:1998

1 - AS/NZS 2399:1998 ACOUSTICS - SPECIFICATIONS FOR PERSONAL SOUND EXPOSURE METERS
4 - PREFACE
6 - CONTENTS
7 - 1 Scope
7 - 2 Normative references
8 - 3 Definitions
8 - 3.1 sound exposure:
8 - 3.2 equivalent-continuous A-weighted sound pressure level; time-average sound level:
9 - 3.3 normalized 8-h-average sound level:
10 - 3.4 sound level range:
10 - 3.5 sound exposure range:
10 - 3.6 reference direction:
10 - 3.7 reference frequency:
10 - 3.8 reference sound pressure level:
10 - 3.9 reference integration time:
10 - 3.10 reference sound exposure:
10 - 4 General performance requirements
12 - 5 Reference conditions
12 - 6 Absolute acoustical sensitivity
12 - 7 Frequency weighting
14 - 8 Linearity of response to steady signals
14 - 9 Response to short-duration signals
15 - 10 Response to unipolar pulses
15 - 11 Latching overload indicator
16 - 12 Sensitivity to various environments
16 - 12.1 General
16 - 12.2 Atmospheric pressure
16 - 12.3 Air temperature
16 - 12.4 Relative humidity
16 - 12.5 Magnetic field
17 - 12.6 Radio-frequency electromagnetic fields
17 - 12.7 Electrostatic discharge
17 - 12.8 Mechanical vibration
17 - 13 Instrument marking
17 - 14 Instruction Manual
20 - Annex A - Sound exposures and corresponding normalized 8-h-average sound levels
21 - Annex B - Recommended tests to verify the performance of a personal sound exposure meter
21 - B1 Initial procedures
21 - B2 Linearity of response to steady signals
22 - B3 Frequency weighting
23 - B4 Response to short-duration signals
24 - B5 Response to unipolar pulses
25 - B6 Latching overload indicator

Specifies acoustical and electrical performance requirements for personal sound exposure meters. Specifications are applicable to instruments intended to be worn on a person for measurement of A-weighted sound exposure resulting from steady, intermittent, fluctuating, irregular or impulsive sounds. This Standard is technically equivalent to, and has been reproduced from, IEC 1252:1993.

Sound exposure is a physical measure that accounts for both the sound pressure and its duration, at a given location, through an integral-over-time of the square of instantaneous frequency-weighted sound pressure.This International Standard is applicable to instruments for measurement of A-frequency-weighted sound exposure resulting from steady, intermittent, fluctuating, irregular, or impulsive sounds. Instruments complying with the specifications of this International Standard are intended to be worn on a person to measure sound exposure. Measurements of sound exposure in the workplace may be useful for determinations of occupational noise exposure, in accordance with ISO 1999 and ISO 9612. This International Standard specifies acoustical and electrical performance requirements for personal sound exposure meters of one accuracy grade. The accuracy grade corresponds to that for an integrating sound level meter which complies with the Type 2 requirements of IEC 804 for an A-weighted sound pressure level range from 80 dB to 130 dB and a nominal frequency range from 63 Hz to 8 kHz. Tolerances on deviations of an instrument's performance from specified design goals represent the performance capabilities of practical instruments. Personal sound exposure meters are required to operate within the tolerances of this International Standard over specified ranges of environmental conditions.

First published as AS 2399-1980.
Jointly revised and designated AS/NZS 2399:1998.