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Hydrogen Technologies Standards form the basic framework for market ramp-up
More information
Climate change Standards and specifications support climate targets
More information
Smart Farming Standards and specifications are drivers for the digitalization of agriculture
More information

Standards [CURRENT]

BS EN ISO 389-4
Acoustics. Reference zero for the calibration of audiometric equipment. Reference levels for narrow-band masking noise

Title (German)

Akustik. Standard-Bezugspegel fuer die Kalibrierung audiometrischer Geraete. Bezugspegel fuer schmalbandige Verdeckungsgeraeusche

Edition 1995-03-15

Original language English

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Hydrogen Technologies Standards form the basic framework for market ramp-up

Climate change Standards and specifications support climate targets

Smart Farming Standards and specifications are drivers for the digitalization of agriculture

BS EN ISO 389-4 Acoustics. Reference zero for the calibration of audiometric equipment. Reference levels for narrow-band masking noise

Want to learn more?

BS EN ISO 389-4
Acoustics. Reference zero for the calibration of audiometric equipment. Reference levels for narrow-band masking noise