GOST R ISO 389-8-2011 确保测量一致性的国家体制.听力测定设备的校准用参考零点.第8部分:耳罩式耳机纯音基准等效阈声压
State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric equipment. Part 8. Reference equivalent threshold sound pressure levels of pure tones for circumaural earphones