ISO DIS 4869-1 Acoustics - Hearing protectors - Part 1: Subjective method for the measurement of sound attenuation
Данный раздел/документ содержится в продуктах:
- Техэксперт: Машиностроительный комплекс
- Картотека зарубежных и международных стандартов
- ISO 17666 Space Systems - Risk Management - First Edition
- 49
- ISO 17666 Space Systems - Risk Management - First Edition
- 49.140
- DIN EN 16602-20-07 Space produce assurance - Quality and safety assurance for space test centres
- DIN EN 16602-20-08 Space product assurance - Storage, handling and transportation of spacecraft hardware
- DIN EN 16602-70 Space product assurance - Materials, mechanical parts and processes
- DIN EN 16602-20-08 Space product assurance - Storage, handling and transportation of spacecraft hardware
- DIN EN 16602-20-07 Space produce assurance - Quality and safety assurance for space test centres
- DIN EN 16602-20-08 Space product assurance - Storage, handling and transportation of spacecraft hardware
- DIN EN 16602-70 Space product assurance - Materials, mechanical parts and processes
- DIN EN 16602-20-08 Space product assurance - Storage, handling and transportation of spacecraft hardware
- DIN EN 16602-20-08 Space product assurance - Storage, handling and transportation of spacecraft hardware
- DIN EN 16602-70 Space product assurance - Materials, mechanical parts and processes
- DIN EN 16602-70 Space product assurance - Materials, mechanical parts and processes
- DIN EN 16602-70-71 Space product assurance - Materials, processes and their data selection
- DIN EN 16602-70-11 Space product assurance - Procurement of printed circuit boards
- CEN EN 16601-00-01 Space systems - Glossary of terms
- ISO 16192 Space systems - Experience gained in space projects (Lessons learned) - Principles and guidelines - First Edition
- ISO 17666 Space systems - Risk management - Second Edition
- AIAA S-117A Space Systems Verification Program and Management Process
- Картотека зарубежных и международных стандартов
International Organization for Standardization
Acoustics - Hearing protectors - Part 1: Subjective method for the measurement of sound attenuation
N DIS 4869-1
Annotation
This International Standard specifies a subjective method for measuring sound attenuation of hearing protectors at the threshold of hearing. The method is a laboratory method designed to yield reproducible values under controlled measurement conditions. The values reflect the attenuating characteristics of the hearing protector only to the extent that users wear the device in the same manner as did the test subjects.
For a more representative indication of field performance the methods of ISO/TS 4869-5 may be used.
This test method yields data which are collected at low sound pressure levels (close to the threshold of hearing) but which are also representative of the attenuation values of hearing protectors at higher sound pressure levels. An exception occurs in the case of amplitude-sensitive hearing protectors for sound pressure levels above the point at which their level-dependent characteristics become effective. At those sound pressure levels the method specified in this International Standard is inapplicable; it will usually underestimate sound attenuation for these devices.
NOTE At low frequencies (below 500 Hz) the sound attenuation may be overestimated by a few decibels as a result of masking caused by physiological noise during the occluded ear tests.
Автоматический перевод:
Акустика - противошумные наушники - Часть 1: субъективный метод измерения поглощения звука
Этот Международный Стандарт определяет субъективный метод измерения поглощения звука протекторов слуха у порога слуха. Метода лабораторный метод предназначен для выхода воспроизводимых значений в контролируемых условиях измерения. Значения отражают смягчающих характеристик противошумных только в той степени, что пользователи носят устройство в той же манере, как это делали испытуемые.
