校准用基准 meaning in English

calibration standard

Acoustics . reference zero for the calibration of audiometric equipment . part 4 : reference levels for narrow - band masking noise
声学.听力测定仪器的校准用基准0 .第4部分:窄频带遮蔽噪声的基准级
Acoustics . reference zero for the calibration of audiometric equipment . part 3 : reference equivalent threshold force levels for pure tones and bone vibrators
声学.听力测定仪器的校准用基准0 .第3部分:纯音和骨振动器用基准等效听阈强度级
Acoustics - reference zero for the calibration of audiometric equipment - part 1 : reference equivalent threshold sound pressure levels for pure tones and supra - aural earphones
声学.听力测定仪器的校准用基准0 .第1部分:纯音和超声耳机用基准等效阈声压级
Acoustics - reference zero for the calibration of audiometric equipment - part 5 : reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 khz to 16 khz
声学.听力测定仪器的校准用基准0 .第5部分:频率范围为8 khz至16 khz的纯音用基准等效听阈声压级