Acoustics. Reference zero for the calibration of audiometric equipment - Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz Ingestion-build-48068 provided that the motoring frequency

provided that the motoring frequency is in the range from 50 Hz to 400 Hz

Luminous signs come in the form of discharge lamps

This published document is applicable to recovery management before

testing and verification of GRP tanks and vessels with or without thermoplastics lining for storage or processing of fluids

The scope of BS EN 15689 is:

Acoustics. Reference zero for the calibration of audiometric equipment - Reference equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz Ingestion-build-48068 provided that the motoring frequency1 Scope This part of ISO 389 specifies reference equivalent threshold sound pressure levels (RETSPLs) of pure tones in the frequency range from 8 kHz to 16 kHz applicable to the calibration of air conduction audiometers for specific earphones. NOTE Some notes and references on the derivation and the test conditions used to determine the reference levels are given in Annex A and the Bibliography.