Acoustics. Reference zero for the calibration of audiometric equipment - Reference threshold of hearing under free-field and diffuse-field listening conditions Ingestion-build-79769 NOTE: Operational requirements and maintenance

NOTE: Operational requirements and maintenance requirements for warning horns are excluded

Manufacturers of fan heaters

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Acoustics. Reference zero for the calibration of audiometric equipment - Reference threshold of hearing under free-field and diffuse-field listening conditions Ingestion-build-79769 NOTE: Operational requirements and maintenanceWhat is ISO 3897 Reference threshold of hearing for the calibration of audiometric equipment about? ISO 389 discusses acoustics for the reference zero for the calibration of audiometric equipment. ISO 3897 is an international standard on reference threshold of hearing under free field and diffuse field listening conditions for the calibration of audiometric equipment to minimize any measurement uncertainty ISO 3897 is the seventh part of a multi part