KS I ISO 9295-2002 Acoustics-Measurement of high-frequency noise emitted by computer and business equipment《声学 计算机和办公装置发射的高频噪声的测量》.pdf

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1、KS I ISO 9295 KSKSKSKSSKSKSKS KSKSKS SKSKS KSKS SKS KS KS I ISO 9295: 2002(IDT ISO 9295: 1989)(2012 ) 2002 9 25 http:/www.kats.go.krI ISO 9295: 2002 : ( ) ( ) ( ) : (http:/www.standard.go.kr) : : 1994 12 14 : 2002 9 25 : 2012 12 29 : 2012-0837 : ( 02-509-7294) (http:/www.kats.go.kr). 10 5 , . I ISO

2、9295: 2002 1 1. 1 2. 1 3. 2 3.1 2 3.2 2 3.3 2 3.4 2 3.5 3 3.6 3 4. 4 4.1 4 4.2 4 4.3 4 4.4 4 4.5 4 4.6 4 5. 5 5.1 5 5.2 5 5.3 5 5.4 5 5.5 5 5.6 5 6. 6 6.1 6 6.2 6 6.3 6 6.4 6 6.5 7 6.5.1 7 6.5.2 7 7. 7 7.1 7 7.2 8 7.3 8 7.4 8 7.5 8 i I ISO 9295: 2002 2 7.6 8 7.7 9 7.8 9 8. A 9 9. 10 9.1 10 9.2 10 9.

3、3 10 9.4 11 10. 11 A () 13 B () 14 ii ICS 17.140.50 KS I ISO 9295: 2002(IDT ISO 9295: 1989)(2012 ) Acoustics Measurement of high frequency noise emitted by computer and business equipment 1989 1 ISO 9295, Acoustics Measurement of high frequency noise emitted by computer and business equipment . ISO

4、9295 ISO 7779: 1988 ISO 7779: 1999 . “ ” . ( , .) , ( , ) ( , ) . . 125 Hz8 kHz 16 kHz , 16 kHz A . 16 kHz (tones) . 1. 4 . 16 kHz . KS A ISO 7779 6. 7. . 3 KS A ISO 7779 6. , 4 KS A ISO 7779 7. . KS A ISO 7779 5. C . 4 . 16 kHz (11.2 kHz22.4 kHz) 4 . 16 kHz 3 dB . 4 , 8., 9. 10. . 2. KS A ISO 6926:

5、 2002 ISO 6926 Acoustics Requirements for the performance and calibration of reference sound sources used for I ISO 9295: 2002 2 the determination of sound power levels . KS A ISO 7779: 2002 ISO 7779: 1999 Acoustics Measurement of airborne noise emitted by computer and business equipment . 3. 3.1 KS

6、 A ISO 7779 6. 3 . “ ” . . 3 . 3 3.23.6 . 4.6. . KS A ISO 7779 6.4 . 3.2 16 kHz . 11.4 kHz22.8 kHz 2.0 dB . 13 mm . 1/3 . S/N 1/3 . 1/12 . (FFT) . 3.3 2 m (boom) . , . 30 . . . . 3.4 1 m , 1.8 m . 4 . a) b) a) 90 c) a) 180 d) a) 270 . . I ISO 9295: 2002 3 3.5 , KS A ISO 7779 6.4.6 . 16 kHz 2 , . FFT

7、 , . 3.6 1/3 . . . a) b) ( , .) c) (6. ) . , . KS A ISO 7779 6.7.2 . FFT , . 3 . N Lp . =NiLpiNL1)10/(101lg10 (1) Li: i , dB ( 20 Pa) 4 Lp N = 4 . 3 Lp N = 3 . , . (2) . cvff 2= (2) f: , Hz f: , Hz c: , m/s v: , m/s (FFT: Fast Fourier Transform) , (2) . (3) . =NiLiL1)10/(tot10lg10 (3) Ltot: , dB ( 2

8、0 Pa ) Li: , dB ( 20 Pa ) I ISO 9295: 2002 4 N: 4. 4.1 . 16 kHz . 3.3 . , . 2 , . 10 kHz 1 . (5) . 4.2 12.5 kHz20 kHz 1/3 , T ( s) . ( 1/12 ) . 3 . ( , ) 0.7 s . 4.3 R (4) (5) . =1SR (4) )/(16.01 TSVe= (5) S: , m2V: , m3T: , s : 4.4 , 3.3 3.4 . 4.5 3.5 . Lp 3.6 . 1/3 . , / 1/3 . . 1 2.5 % . 4.6 (6) . RLLpW4lg10 = (6) LW: , dB ( 1 pW) Lp: 4.5 4 , dB ( 20 Pa ) I ISO 9295: 2002 5 R: 4.3 5. 5.1 .

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