ISO 1680-2013 pdf free.Acoustics – Test code for the measurement of airborne noise emitted by rotating electrical machines.
ISO 1680 specifies all the information necessary to carry out efficiently and under standardized conditions the determination, declaration, and verification of the noise emission characteristics of rotating electrical machines. It specifies noise measurement methods that can be used, and specifies the operating and mounting conditions required for the test.
Noise emission characteristics include the sound power level and emission sound pressure level. The determination of these quantities is necessary:
— for comparing the noise emitted by machines;
— to enable manufacturers to declare the noise emitted; and
— for the purposes of noise control.
The use of this International Standard as a noise test code ensures the reproducibility of the determination of the noise emission characteristics within specified limits determined by the grade of accuracy of the basic noise measurement method used. Noise measurement methods allowed by this International Standard arc precision methods (grade 1), engineering methods (grade 2) and survey methods (grade 3). Methods of engineering grade (grade 2) are to be preferred.
This International Standard is applicable to rotating electrical machines of any length, width or height.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application, For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
I SO 3741, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for reverberation test rooms
ISO 3743-1, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering methods for small movable sources in reverberant fields — Part 1:
Comparison method for a hard-walled test room
ISO 3743-2, Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering methods for small, movable sources in reverberant fields — Part 2: Methods for special reverberation test rooms
ISO 3744:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 3745:2012, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for anechoic rooms and hemi-anechoic rooms
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 time averaged sound pressure level LpT ten times the logarithm to the base 10 of the ratio of the time average of the square of the sound pressure, p, during a stated time interval of duration, T (starting at t1 and ending at t2), to the square of a reference value, po, expressed in decibels
where the reference value, P0. is 20 iiPa
Note ito entry: Because of practical limitations of the measuring instruments, p2 is always understood to denote the square of a frequency-weighted and frequency-band-limited sound pressure. If a specific frequency weighting as specified in IEC 61672-1 and/or specific frequency bands are applied, this should be indicated by appropriate subscripts; e.g. Lp,A,1o denotes the A-weighted time-averaged sound pressure level over 10 s.
3.2 measurement surface hypothetical surface of areaS, enveloping the source on which the measurement points are located
Note I to entry: The measurement surface terminates on one or more reflecting planes.ISO 1680 pdf download.