None<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 12<\/td>\n | Tables \n 0.1 International Standards specifying various methods for determining \n the sound power levels of machines and equipment <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 1 Scope <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 2 Normative references 3 Definitions 1 Estimated values of the standard deviation of reproducibility \n of sound power levels determined according to this part of \n ISO 3743 <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Figures \n 1 Values of R at the one-third-octave-band centre frequencies for \n V=70 m3 <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 2 Maximum permitted differences between octave-band power \n levels of broad-band noise sources measured in accordance \n with 4.7 a <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 3 Relative tolerances for the instrumentation system <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 4 Minimum number of source locations, N5 , for given numbers of \n microphone positions, Nm , values of estimated standard \n deviations, Sm , and octave-band centre frequencies <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 5 Corrections for background sound pressure levels . . . . . . . . . . . . . . . . 1 O \n A.1 Calibration accuracy for reference sound source <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 4 \n 5 \n 6 \n 7 \n 8 \n 9 \n 10 \n Requirements for special reverberation test room ………….. . \n Instrumentation …………………………………….. . \n Installation and operation of source under test …………….. . \n Measurements in test room ……………………………. . \n Calculation of sound power levels ………………………. . \n Information to be recorded ……………………………. . \n Information to be reported \n Annexes \n A Characteristics and calibration of reference sound source \n 3 \n 5 \n 6 \n 7 \n 10 \n 11 \n 11 \n 12 \n 8 Guidelines for the design of special reverberation test rooms 8.1 Recommended room dimension ratios for rectangular rooms <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 8.1 Hardboard membrane absorber 8.2 Sound absorption coefficient a for the membrane absorber \n measured in a 200 m3 reverberation room <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 8.3 Limiting curves for the ratio of the reverberation time T to the \n nominal reverberation time Tnom for a 70 m3 room <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 8.4 Plot of an experimentally determined reverberation time \n (normalized to T1000) as a function of one-third-octave-band centre \n frequency <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | C Examples of suitable instrumentation systems <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | D Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" ANSI\/ASA S12.53-1999\/Part 2 \/ ISO 3743-2:1994 (R2015) American National Standard 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 (a nationally adopted international standard). This standard, along with ANSI S12.53\/Part 1-2011 replaces ANSI S12.33-1990<\/b><\/p>\n |