ISO 20145:2019 PDF

Scope: This document specifies two methods of measuring the level of acoustic pressure at the outlet of an exhaust silencer: — the first method, called "steady-state mode”, is intended to evaluate the noise level under steady state flow, i.e. constant upstream pressure (steady-state test according to ISO 6358-1); and — the second method, called “discharge”, is intended to measure the noise level during the decrease of the pneumatic pressure (discharge test according to ISO 6358-2). This document is applicable to pneumatic exhaust silencers and devices designed to reduce the sound produced by discharges of compressed air, entering in the scope of application of ISO 6358-1 and

ISO 20145:2019 Referenced Document

IEC 60942 Electroacoustics - Sound calibrators
IEC 61260 Amendment 1 - Electroacoustics - Octave-band and fractional-octave-band filters
IEC 61672-1 Electroacoustics - Sound level meters - Part 1: Specifications
ISO 11202:2010 Acoustics - Noise emitted by machinery and equipment - Determination of emission sound pressure levels at a work station and at other specified positions applying approximate environmental corrections
ISO 4871 Acoustics - Declaration and verification of noise emission values of machinery and equipment
ISO 6358-1 Pneumatic fluid power*， 2024-03-01 Update
ISO 6358-2 Pneumatic fluid power*， 2024-03-01 Update

2019 ISO 20145:2019 Pneumatic fluid power — Test methods for measuring acoustic emission pressure levels of exhaust silencers