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
1,516
Accredited labs
17
Countries
Showing 51–75 of 1,516 labs
ALS France – Site de Paris
Active
NF T 90-412
0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN EN ISO 16649-3
DIN EN ISO 6888-3
+ 3 more
ALS Germany
Active
DIN EN ISO 15587-1
DIN EN ISO 15587-2
DIN EN ISO 14403-2
DIN 38405-4
DIN 38405-8
+ 3 more
ALS Laboratories (UK)
Active
on BS 4401:Part 3:1970(1986)
ISO 12966-2
AM/C/108 based on BS EN ISO
BS 684 2.14:2001
BS EN 288-Part 9 :1999
+ 3 more
ALSTOM Transportation Germany GmbH Prüfstelle für eisenbahntypische Prüfungen an Schienenfahrzeugen
Active
DIN 27201-5
DIN 25043-1
DIN 25043-2
DIN EN 13272
DIN EN 13272-1
+ 3 more
IEC 60068-2-1
IEC 60068-2-2
UNE-EN 60068-2-14
UNE-EN 60068-2-78
IEC 60068-2-6
+ 3 more
Railway brake — magnetic track brakes (U
auch als Vor-Ort-Kalibrierung
Rillentiefe Pt auf 0,2 µm
Tiefeneinstellnormalen
Rauheit auf Raunormalen
+ 3 more
AN DIAG
Active
NF X 43-269
NF X 43-269 - Annexe K
NF X43-050 (parties utiles de
ISO 22262-1
NF X 43-050
+ 1 more
APAVE EXPLOITATION FRANCE
Active
DIN EN 14385
ETSI EN 301 489-1 V2.2.3 2019-11
NF X43-551
IS EN 1948-1:2006 2006
DIN EN 14789
+ 3 more
APAVE INSPECTION SPAIN
Active
UNE-EN 14584
UNE-EN 13554
UNE-EN 12819
UNE-EN 12817
UNE-EN ISO 15614-1
+ 3 more
APEC Environmental
Active
QOP03 based on HSG 248
QOP01 based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
CEM DI-002
EURAMET CG-2
CEM DI-014
CEM DI-006
CEM DI-016
+ 3 more
ISO 6059
ASTM D 1209
UNE-EN ISO 8467
SM 4500-NH D 3
UNE 77048
+ 3 more
ISO/IEC 25010
ISO/IEC 25040
ISO/IEC 25012
ISO/IEC 5259-2
AQRAT
Active
Messschieber für 0 mm
Außen-, Innen- und > 500 mm
> 1000 mm
Tiefenmessschieber * 0 mm
Sondermessschieber 0 mm
+ 3 more
AQUANALYSE Laboratoire
Active
NF T 90-412
DIN EN ISO 7899-1
DIN EN ISO 10304-1
DIN EN 12880
ISO 5815-1
+ 3 more
ARGANO ASESORES
Active
UNE-EN 14790
Railway wheel-rail interaction — roughne
BS ISO 15713:2006
UNE-EN 14385
UNE-EN 15058
+ 3 more
AS International Corporation
Active
ISO 5983-1:2005/Cor.1:2008, ISO20483:201
07L.1.07 based on ISO 6865:2001
ISO 712
07L.1.02 based on ISO 6496:1999,
ISO 12966-2
+ 3 more
NF S92-501 (mars
EURAMET cg-18
CEM Ed
CEM GUIA
CEM TH-001
CEM TH-007
+ 3 more
DIN EN 13864
DIN EN 14808
DIN EN 12235
ISO 2549
ISO 4919
+ 3 more
No matching labs found.