AS 1055:2018 pdf free

AS 1055:2018 pdf free.Acoustics – Description and measurement of environmental noise
Sound level meters shall be Class 1 or Class 2, as specified in AS IEC 61672.1. Where used, statistical analysers and data loggers shall provide equivalent performance, in respect of frequency-weighting,time-weighting, statistical accuracy and in tolerances, to the instrumentation specified in Table 1. Storage devices, including but not limited to level recorders, magnetic tape recorders and digital recorders, shall also conform with the relevant requirements of AS IEC 61672.1.
NOTES:
1 Special care should be taken to ensure that the dynamic range of the instruments is large enough for the applications, and that the inherent electrical noise and overload capacity of these instruments are suitable.
2 The frequency range of the instruments used should also be considered. Typically the range of frequencies should include, as a minimum, the one-third octave bands from 25 Hz to 10 000 Hz. For measurements of low-frequency sound to this Standard, the frequency range should include the one-third octave bands from 12.5 Hz to 10 000 Hz. Other frequency ranges may be required by specific Standards or regulatory policy documents.
3 The accuracy of the measurement will depend on the temporal characteristics of the sound being measured and the type of instrumentation being used. Care should be taken to achieve required accuracy in any given circumstances.
4 Methods of determining the time average A-weighted sound pressure level using the various kinds of equipment are given in Clause 6.4.
The performance of the instrumentation when in field use shall be checked periodically with a pistonphone, portable reference sound source or other portable checking device appropriate to the sound level meter or other instrumentation system, and immediately before and after measurements are made. For remote| logging stations some form of calibration shall be performed at regular intervals. This could be by electronic or acoustic means. For extended measurement periods, these checks shall be performed immediately before and after each measurement sequence. Where the calibration signal cannot be excluded from the data, the instrument shall not be switched off between checks. In all cases, the operating instructions for the instrument shall be followed carefully. If the instrumentation system registers a discrepancy equal to or greater than 1 dB between consecutive checks, any measurements in the interval between the two checks shall be considered invalid.AS 1055 pdf free.