ISO 9614-1:1993 PDF

Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 1: Measurement at discrete points

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Title (English):

ISO 9614-1:1993

Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 1: Measurement at discrete points

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 19
Publication date:: June 3, 1993
Edition:: ISO IS 9614 edition 1 version 1
ICS:: 17.140.01

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Description (English):

Specifies a method for measuring the component of sound intensity normal to a measurement surface which is chosen so as to enclose the noise source(s) of which the sound power level is to be determined. The one-octave, one-third-octave or band-limited weighted sound power level is calculated from the measured value. The method is applicable in situ or in special purpose test environments to any source for which a physically stationary measurement surface can be defined, and on which the noise generated by the source is stationary in time.

Technical details

Technical committee: ISO/TC 43/SC 1 - Noise
SKU: ISO 9614-1:1993

Abstract

Overview

ISO 9614-1:1993 - "Acoustics - Determination of sound power levels of noise sources using sound intensity - Part 1: Measurement at discrete points" - specifies a standardized method to determine the sound power radiated by a noise source by measuring the normal component of sound intensity on a hypothetical surface enclosing the source. Measurements are taken at discrete points (one-octave or one‑third‑octave bands) and used to compute octave, one‑third‑octave or band‑limited A‑weighted sound power levels. The method is applicable in situ or in special test environments for sources with stationary noise and a physically definable measurement surface.

Key topics and requirements

Measurement principle: Sound power is obtained by integrating the normal sound intensity over a surface that fully encloses the source - i.e., summing partial sound powers from discrete surface segments.
Frequency ranges: One‑third‑octave band measurements are supported in practice from about 50 Hz to 6.3 kHz; one‑octave band data commonly from 63 Hz to 4 kHz. A‑weighted values are calculated from band results, not measured directly.
Instrumentation & probes: Use of calibrated sound intensity probes and instrumentation compliant with IEC/ISO requirements; attention to probe orientation and dynamic capability.
Acoustic environment: The method tolerates more realistic (less restricted) test conditions than pressure‑based standards but requires stationarity of the source and control of extraneous noise and airflow (effects covered in annexes).
Quality indicators & uncertainty: The standard defines grades of accuracy (e.g., precision, engineering, survey) and ancillary tests (annex B) and field indicators (annex A) used to assess measurement quality and estimate uncertainty.
Practical considerations: Guidance on installation, surface segmentation, measurement positions, and factors that bias results (airflow, absorption within the measurement surface - annexes C and D).

Applications and who uses it

Acoustical consultants and test laboratories performing in situ sound power determinations of machinery and installations.
measuring noise emissions of large or installed equipment that cannot be tested in anechoic or calibrated reverberant rooms.

Abstract

Overview

Key topics and requirements

Measurement principle: Sound power is obtained by integrating the normal sound intensity over a surface that fully encloses the source - i.e., summing partial sound powers from discrete surface segments.
Frequency ranges: One‑third‑octave band measurements are supported in practice from about 50 Hz to 6.3 kHz; one‑octave band data commonly from 63 Hz to 4 kHz. A‑weighted values are calculated from band results, not measured directly.
Instrumentation & probes: Use of calibrated sound intensity probes and instrumentation compliant with IEC/ISO requirements; attention to probe orientation and dynamic capability.
Acoustic environment: The method tolerates more realistic (less restricted) test conditions than pressure‑based standards but requires stationarity of the source and control of extraneous noise and airflow (effects covered in annexes).
Quality indicators & uncertainty: The standard defines grades of accuracy (e.g., precision, engineering, survey) and ancillary tests (annex B) and field indicators (annex A) used to assess measurement quality and estimate uncertainty.
Practical considerations: Guidance on installation, surface segmentation, measurement positions, and factors that bias results (airflow, absorption within the measurement surface - annexes C and D).

Applications and who uses it

Acoustical consultants and test laboratories performing in situ sound power determinations of machinery and installations.
measuring noise emissions of large or installed equipment that cannot be tested in anechoic or calibrated reverberant rooms.

ISO 9614-1:1993 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and who uses it

Abstract

Overview

Key topics and requirements

Applications and who uses it

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