( ) ( ) ( ) 1. OEM/ODM ANSI Z89.1 EN GB ANSI S

Size: px

Start display at page:

Download "( ) ( ) ( ) 1. OEM/ODM ANSI Z89.1 EN GB ANSI S"

芙箕昌
4 years ago
Views:

1 ( ) ( ) ( ) 1. OEM/ODM ANSI Z89.1 EN GB ANSI S

2 ANSI Z89.1 (1) ~19.86kg.m/s 5.52m/s (2) 3.54~3.64kg mm 76mm (3) 0~4450N(0~1000lb) (4) ISEA Headform kg (5) 4450N EN GB ANSI Z ANSI Z89.1 EN GB EN GB ,000 5mm 1,000mm 50 1mm 48mm kg 45 kg ,000N ,900N 0~40kN 0~30kN 25mm 25~50mm 30~50mm EN960(1994) GB

3 PIC PIC LCD

4 (1) (2) 3 (3) 6 (4) PIC 2.2 ANSI S (ASA STD ) (real-ear method) (physical method) (real-ear attenuation) (dummy head) (insertion loss) ANSI S (ASA STD ) (earmuff) (earplug) (diffusion field) (2) RT dB(re 20 Pa) 60dB (2) 4

5 (white noise) 1/ (3) (dummy head) 2 (artificial flesh) Satin Flex Plastiflex 664 American National Standard type L or M pressure microphone American National Standard type-2 sound level meter 60dB (Hz) PIC LCD 5

6 ANSI S CNS Hz 250Hz 500Hz 1000Hz 2000Hz 3150Hz 4000Hz 8000Hz dB (headband) 4 (1) 25mm 200mm (2) 1000 (3) 10~12 (4) 6

7 RC

8 CNS T EN 352-1, 1993 CNS CEN CNS CEN mm 130mm 170mm 90% 150mm 1. mm mm

2. 2.5% 5% 50% 95% 97.5% mm 127.95 131.80 151.33 168.

9 2. 2.5% 5% 50% 95% 97.5% mm mm S S 9

10 1 ANSI S (ASA STD ) Method for the Measurement of Real-Ear Protection of Hearing Protectors and Physical Attenuation of Earmuffs 1.4 Applications The primary method of this standard applies to communication units, special helmets, including safety helmets, pressure suits and other systems with sound-protective features, and to hearing-protective devices used in combination with one another, that is, earplugs plus earmuffs. The supplemental method applies to earmuff-type devices and provides data for use in earmuff design and production quality control, as well as for various other attenuation performance specification purposes. Earplugs may not be evaluated by this method. Neither the primary nor supplemental method is applicable for testing the nonlinear devices, amplitude-sensitive devices, nor other hearing-protective devices with features designed to operate exclusively against impulsive noises. These devices are included only in so far as their performance complies with the requirements of the standard. Standard methods for the real-ear evaluation of these devices are not established; consequently, the effectiveness of their special features cannot be adequately described in a uniform manner. 2.5 Dummy Head A device that approximated certain physical characteristics and dimensions of and average adult male human head and is used for measuring the attenuation of circumaural hearing protectors Ambient Noise Table 1. Maximum permissible ambient noise The ambient noise (with instrumentation on and no test signal present) at the position of the listener in the test room shall not exceed the values given in Table 1., measured with the listener absent from the room. Frequency in Hertz Octave band level in decibels, re 20 N/m2 (20 Pa) Lower limit Upper limit Center

11 Sound Field Characteristics (2)The sound pressure level measured at six positions relative to the center of the subject s head (without subjects), 10cm(3.9in.) in front-back dimension and 15cm ( 5.9 in.) in the up-down and right-left dimensions, shall remain within a range of 6dB for all test bands (see ). The difference in sound pressure level between the right-left positions shall not exceed 2 db Sound Field Measurement A directional (cosine or cardioid) microphone that exhibits in its free-field polar response at least 10-dB front-to-side and front-to-back rejection for each test band shall be used to measure the sound filed at the test space. The sound field shall be considered to approximate a random incidence field if, when the microphone is rotated about the center of the test space through 360 in each of the three perpendicular planes of the room, the observed sound pressure level in each test band remains within the variation allowed in Table Sound Field Measurement (3)The signal on-off switch shall operate in such a manner that no transient or extraneous noises are audible to the normal ear. After operation of the switch, the time required for the sound pressure level of the test signal to rise from -20dB to -1dB, with reference to its final steady value, shall be not less than 0.02 second and not more than 0.10 second, and the time required for the sound pressure level of the signal to fall by 20 db shall be not less than second and not more than 0.10 second. This requirement is consistent with American National Standard Specifications for Audiometers, S (R1973), and shall be met by the electronic system feeding the loudspeakers. 11

12 Test Room (2) The band pressure level at the microphone for each test band frequency shall be not less than 85dB with reference to 20 N/m 2 (20 Pa) and shall be at least 60 db higher than the level of the test room ambient noise in each test frequency band. (3) The random incident characteristics of the sound field shall be determined in accordance with The sound field used in the primary method is adequate for the physical measures when the band pressure level requirement of (2) is satisfied. 12

E15-3D1 1. Specifications Compact 4-Way Cassette type Model name MMU- AP0071MH2UL AP0091MH2UL AP0121MH2UL AP0151MH2UL AP0181MH2UL Cooling Capacity kbt

E15-3D1 1. Specifications Compact 4-Way Cassette type Model name MMU- AP0071MH2UL AP0091MH2UL AP0121MH2UL AP0151MH2UL AP0181MH2UL Cooling Capacity kbt E15-3D1 Compact 4-Way Cassette type MMU-AP0071MH2UL MMU-AP0091MH2UL MMU-AP0121MH2UL MMU-AP0151MH2UL MMU-AP0181MH2UL Contents 1. Specifications 2. Dimensions 3. Center of gravity 4. Piping diagram 5. Wiring