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Acoustics. Reference zero for the calibration of audiometric equipment. Reference equivalent threshold vibrat…

Acoustics — Reference zero for the calibration of audiometric equipment — Part 3: Reference equivalent thresh…

Overview ISO 389-3:2016 defines the reference zero for bone-conduction audiometric equipment by specifying Reference Equivalent Threshold Vibratory Force Levels (RETVFL) for pure tones and bone vibra…

Concrete — Classification by compressive strength