Acoustics. Reference zero for the calibration of audiometric equipment - Preferred test conditions for the determination of reference hearing threshold levels Ingestion-build-48068 BS EN 50121-3-2 is the

BS EN 50121-3-2 is the second sub-part of the third part of the BS EN 50121 series of documents that specifies emission and immunity aspects of EMC for electrical and electronic apparatus intended for use on railway rolling stock

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Acoustics. Reference zero for the calibration of audiometric equipment - Preferred test conditions for the determination of reference hearing threshold levels Ingestion-build-48068 BS EN 50121-3-2 is the1 Scope This part of ISO 389 specifies test conditions for determining the hearing thresholds of subjects for the purpose of establishing standardized values for reference hearing threshold levels.