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 6358â€‘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 6358â€‘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 6358â€‘1 and ISO 6358â€‘2.