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  •  China "supra" GB Standards List:
  • Standard  Code Standard Title Standard Class Order
    GB/T 4854.1-2004 Acoustics--Reference zero for the calibration of audiometric equipment--Part1:Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones
    声学 校准测听设备的基准零级 第1部分:压耳式耳机纯音基准等效阈声压级
    China National Standards
    supra

    English PDF
    GB/T 25498.3-2010 Electroacoustics - Simulators of human head and ear - Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
    电声学 人头模拟器和耳模拟器 第3部分:校准压耳式测听耳机用声耦合器
    China National Standards
    supra

    English PDF
    GB/T 25498.1-2010 Electroacoustics - Simulators of human head and ear - Part 1: Ear simulator for the calibration of supra-aural earphones
    电声学 人头模拟器和耳模拟器 第1部分:校准压耳式耳机用耳模拟器
    China National Standards
    supra

    English PDF

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