BS EN 61252:1997+A2:2017:2018 Edition
$142.49
Electroacoustics. Specifications for personal sound exposure meters
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 32 |
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 1999 and ISO 9612.
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 130 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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 8 | Annex ZA (normative) Other international publications quoted in this standard with the references of the r… |
| 13 | Foreword Foreword to amendment A1 Introduction |
| 14 | 1 Scope 1.1 Sound exposure is a physical measure that accounts for both the sound pressure and its durati… 1.2 This International Standard is applicable to instruments for measurement of A-frequency-weigh… 1.3 This International Standard specifies acoustical and electrical performance requirements for … 1.4 Tolerances on deviations of an instrument’s performance from specified design goals represent… 2 Normative references |
| 15 | 3 Definitions sound exposure equivalent-continuous A-weighted sound pressure level; time-average sound level normalized 8-h-average sound level |
| 16 | sound level range sound exposure range reference direction reference frequency reference sound pressure level reference integration time reference sound exposure reference orientation (of a personal sound exposure meter) 4 General performance requirements 4.1 A personal sound exposure meter is a combination of a microphone, an amplifier with the requi… 4.2 Because only its overall performance is important, an actual instrument need not be separable… |
| 17 | Figure 1 Functional elements of a personal sound exposure meter 4.3 An optional (but preferred) accessible output test point may be provided. 4.4 The manufacturer shall provide the means to substitute an electrical input signal in place of… 4.5 The sound exposure indicator may be built into, or be separate from, the wearable part of an … 4.6 The smallest increment of sound exposure displayed by the indicator shall be not greater than… 4.7 The sound level range shall extend at least from�80�dB to�130�dB. 4.8 The manufacturer shall state in the Instruction Manual the sound exposure range and the sound… 4.9 If the manufacturer-specified ranges of sound exposure and sound level exceed the minimum req… 4.10 If the specified lower boundary of the sound level range is less than�80�dB, the lower bound… 4.11 Specifications in subsequent clauses for the acoustical and electrical performance of a pers… 4.12 A power supply of the type recommended by the manufacturer shall be able to operate a person… |
| 18 | 5 Reference conditions 6 Absolute acoustical sensitivity 6.1 A means shall be available for the user to check and maintain the sensitivity of a personal s… 6.2 The personal sound exposure meter shall be checked and, if necessary, adjusted in accordance … Table 1 Design-goal A-frequency weighting relative to response at 1 kHz and the tolerances % |
| 19 | 7 Frequency weighting 7.1 Under the reference environmental conditions of�clause� 7.2 At nominal frequencies from�63�Hz to�8�kHz, 7.3 Tolerances in decibels are given in the column headed “ 7.4 Compliance with the requirements of� 8 Linearity of response to steady signals 8.1 For steady sinusoidal signals at a frequency of�1�kHz, and for changes in sound exposure with… 8.2 For steady sinusoidal signals at a frequency of�63�Hz, and for changes in both input sound pr… 8.3 For steady sinusoidal signals at a frequency of�8�kHz, and for changes in both input sound pr… 8.4 Annex B |
| 20 | 9 Response to short-duration signals 9.1 At a design-goal sound exposure of�1�Pa 9.2 The level of the steady�4�kHz reference input signal shall correspond to a nominal sound pres… 9.3 The duration of the steady�4�kHz signal shall be such that the indicated sound exposure is be… 9.4 All tonebursts shall start and stop at a zero crossing. The duration of individual tonebursts… 9.5 Sound exposures indicated in response to a sequence of repeated�1�ms and�10�ms tonebursts mee… 9.6 Annex B 10 Response to unipolar pulses 11 Latching overload indicator 11.1 A latching overload indicator shall be provided to indicate that the sound pressure level at… 11.2 Annex B 12 Sensitivity to various environments 12.1 General |
| 21 | 12.2 Atmospheric pressure 12.3 Air temperature 12.4 Relative humidity 12.5 Magnetic field 12.6 Radio-frequency electromagnetic fields 12.7 Electrostatic discharge 12.8 Mechanical vibration 13 Instrument marking 13.1 If practical, the name of the quantity displayed (sound exposure) and its unit, or abbreviat… 13.2 A personal sound exposure meter that complies with all specifications of this International … |
| 22 | 14 Instruction manual |
| 23 | 15 Electromagnetic and electrostatic compatibility requirements and test procedures 15.1 Field of application 15.2 Emission limits 15.3 Electrostatic discharges |
| 24 | 15.4 Immunity to power- and radio-frequency fields 15.5 Test procedures |
| 27 | Annex A (informative) Sound exposures and corresponding normalized 8-h-average sound levels Table A.1 Sound exposures and corresponding normalized 8-h-average sound levels |
| 28 | Annex B (informative) Recommended tests to verify the performance of a personal sound exposure meter Initial procedures The manufacturer may recommend equivalent tests as alternatives to those described in this annex … If the resolution of a personal sound exposure meter is less than the minimum of�0,1�Pa The description of tests in this annex assumes that the personal sound exposure meter to be teste… All tests should be performed at, or referred to, the reference conditions of�clause� The personal sound exposure meter should be checked and adjusted, if necessary, in accordance wit… If the performance of a personal sound exposure meter is to be tested with acoustic signals, the … A means should be provided to measure sound-exposure integration times within�1�%. Linearity of response to steady signals Linearity of response to steady�1�kHz sinusoidal signals should be tested with different combinat… Minimum set of target conditions for�1�kHz steady-signal linearity tests Table B.1 |
| 29 | For each test condition in� At�63�Hz and�8�kHz, the linearity of response to steady signals may be tested over a more limited… Frequency weighting Frequency weighting is tested with constant-amplitude, sinusoidal signals. The sound level of the… Tests should be performed at the eight nominal frequencies specified in� As an example, if the�1�kHz input sound pressure level ( A measured exposure ratio is the measured sound exposure at some frequency divided by the measure… Response to short-duration signals The response of a personal sound exposure meter to short-duration signals is determined by compar… The measured sound exposure, The input signal level, time between tonebursts, and total sound-exposure integration time of the… Any suitable combination of�1�ms or�10�ms duration, 4�kHz tonebursts meeting the requirements of�… |
| 30 | Response to unipolar pulses The recommended test for response to unipolar signals utilizes a sequence of rectangular pulses. … Apply a sequence of positive-going pulses until the indicated sound exposure is greater than�10�Pa Latching overload indicator The recommended electric signal for testing the response of the latching overload indicator is a … Table B.2 Conditions for testing response to short-duration signals With the test signal applied through the input test facility, the overload indicator should trigg… The overload indicator should not trigger when the equivalent sound level of a continuous�1�kHz s… |
| 31 | Annex C (informative) Emission limits Table C.1Limits for radiated disturbance of class 8 ITE at a measuring distance of 10 m |
