IEC 61252 pdf download

IEC 61252 pdf download Electroacoustics – Specifications for personal sound exposure meters
1 Scope
1.1 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.
1.2 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 1 999 and ISO 961 2.
1.3 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 60804 for an A-weighted sound pressure level range from 80 dB to 1 30 dB and a nominal frequency range from 63 Hz to 8 kHz.
1.4 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.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. Members of IEC and ISO maintain registers of currently valid normative documents.
IEC 60050(801 ):1 984, Advance edition of the International Electrotechnical Vocabulary,Chapter 801, Acoustics and electroacoustics
IEC 60651 :1 979, Sound level meters
IEC 60801 -2:1 984, Electromagnetic compatibility for industrial-process measurement and control equipment – Part 2: Electrostatic discharge requirements
IEC 60801 -3:1 984, Electromagnetic compatibility for industrial-process measurement and control equipment – Part 3: Radiated electromagnetic field requirements
IEC 60804:1985, Integrating-averaging sound level metersIEC 60942:1988,Sound calibrators
IEC 61000-4-2:1995，Electromagnetic compatibility (EMC) – Part 4:Testing and measurementtechniques – Section 2: Electrostatic discharge immunity test. Basic EMC publication
IEC 61000-4-3:1995,Electromagnetic compatibility (EMC) – Part 4:Testing and measurementtechniques – Section 3: Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-6-1:1997，Electromagnetic compatibility(EMC) – Part 6: Generic standards -Section 1: lmmunity for residential, commercial and light-industrial environments
IEC 61000-6-2:1999，Electromagnetic compatibility (EMC) – Part 6-2: Generic standards -lmmunity for industrial environments
CISPR 22:1997,Information technology equipment – Radio disturbance characteristics -Limitsand methods of measurement
CISPR 61000-6-3:1996,Electromagnetic compatibility (EMC) – Part 6: Generic standards -Section 3: Emission standard for residential, commercial and light-industrial environments
ISO 266:1975,Acoustics – Preferred frequencies for measurements
ISO 1683:1983,Acoustics – Preferred reference quantities for acoustic levels
Iso 1999:1990，Acoustics – Determination of occupational noise exposure and estimation ofnoise-induced hearing impairment
lSO 9612:199X，Acoustics – Guidelines for the measurement and assessment of exposure tonoise in the working environment *
3Definitions
For the purposes of this International Standard, the following definitions apply. Definitions areconsistent with corresponding definitions in lEC 60050(801).