Acoustics. Reference zero for the calibration of audiometric equipment - Reference levels for narrow-band masking noise1 Scope This part of ISO 389 specifies reference levels for narrow band masking noise presented by air conduction from an earphone in pure tone audiometry. The data are given in terms of levels to be added to the reference equivalent threshold sound pressure levels for the corresponding pure tone frequencies as specified in ISO 389: 1991 or ISO 389 2, respectively, when the masking earphone is placed on the appropriate acoustic coupler, ear simulator

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This document specifies the characteristics of geosynthetic barriers

particular emphasis being placed on the use of the manufacturer’s handbook as the definitive reference for any user’s particular equipment

other applicable requirements for these types of filters are given in EN 166

Annex D (normative) Determination of sideways stability

BS EN 10130 is an indispensable guide for those who specify

Who is BS EN IEC 60384-21 - Fixed capacitors for use in electronic equipment for

It shall ensure that the materials and components used in the fabrication of the mobile fire extinguisher are free from any defect likely to impair the safe use of the extinguisher

2 specification

BS 1133-19 guides you with the management of the desiccant

BS EN 868-2 specifies materials