Scope
ISO 11820:2019
In-Situ Sound Attenuation Measurement of Silencers
ISO 11820 specifies the in-situ measurement method for determining the acoustic attenuation performance of silencers installed in railway ventilation ducts, brake systems, and exhaust lines. This test is critical for validating noise control equipment on operating trains and stationary installations where laboratory testing is impractical. Railway manufacturers, maintenance operators, and acoustic engineers use these measurements to verify compliance with noise regulations and to optimize silencer design. Accreditation ensures that attenuation claims are reliable and that performance targets for noise reduction are consistently achieved in real-world applications.
What it measures
- Sound pressure level reduction across silencer (dB)
- Attenuation performance by frequency band
- Insertion loss of silencer in situ
- Acoustic performance under operating conditions
- Noise transmission loss through silencer element
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DIN EN ISO 11821
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BS EN ISO 11821
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NF EN ISO 11821
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UNI EN ISO 11821
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UNE EN ISO 11821
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NEN EN ISO 11821
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DIN EN ISO 3095
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BS EN ISO 3095
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NF EN ISO 3095
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UNI EN ISO 3095
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UNE EN ISO 3095
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NEN EN ISO 3095
1,273
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15
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Showing 176–200 of 1,273 labs
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OM H-3 based on ISO 9698:2019
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SM 4500 H+
UNE 7027-1
UNE 7887
SM 4500-NO B 2
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CERECO - LABORATOIRE SUD
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DIN EN 1988-1
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NF T 90-412
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DIN EN 12593
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DIN EN 12390-6
DIN EN 62196-1: 2015
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NF P 98-532
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CERTOTTICA S.C.R.L.
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ISO 17234-1
ISO 4045
EPA 8270
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DIN EN ISO 17075-1
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DIN EN 13284-1
BS ISO 9096:2017
requirements of BS EN 15259:2007
Standard and BS EN 15259:2007
DIN EN ISO 16911-1
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Druck *
> –0,12 bar bis
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Überdruck p e > –0,01 bar bis
> 0,03 bar bis
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CEcert
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IEC 61000-4-2: 2008
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DIN EN 17892
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ISO 12966-2
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DIN EN 1186-3
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UNE-EN 55016-2-1
UNE-EN 61000-4-11
UNE-EN 61000-4-8
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ID179
Pt 500
Railway brake disc acoustic emissions (E
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Thrombozytenaggregationstest
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CEM ME-004
EURAMET cg-11
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UNE 118019
UNE 118012
ISO 22980
UNE 118020
UNE 118021-2
- Gleichspannung
Quellen > 0,10 V
> 1 V
> 10 V
- Gleichstromstärke
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CONSORCI DE MEDI AMBIENT I SALUT PÚBLICA DE LA GARROTXA (SIGMA) LABORATORI POLIVALENT DE LA GARROTXA
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SM 3111 B
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SM 2330 B
SM 3113 B
UNE-EN ISO 8467
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ISO 16000-3
BS ISO 9227:2022
ISO 16000-6
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