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
🇩🇪
DIN EN ISO 11821
🇬🇧
BS EN ISO 11821
🇫🇷
NF EN ISO 11821
🇮🇹
UNI EN ISO 11821
🇪🇸
UNE EN ISO 11821
🇳🇱
NEN EN ISO 11821
🇩🇪
DIN EN ISO 3095
🇬🇧
BS EN ISO 3095
🇫🇷
NF EN ISO 3095
🇮🇹
UNI EN ISO 3095
🇪🇸
UNE EN ISO 3095
🇳🇱
NEN EN ISO 3095
1,516
Accredited labs
17
Countries
Showing 376–400 of 1,516 labs
EMCCons RASEK
Active
IEC 61000-4-2: 2008
IEC 61000-4-3: 2006
IEC 61000-4-4: 2012
IEC 61000-4-5: 2005
IEC 61000-4-6: 2013
+ 3 more
EMCCons RASEK
Active
- Gleichspannung
> 0,12 V
Vorverstärker > 1,2 V
> 12 V
> 120 V
+ 3 more
ENSATEC, S.L. (Unipersonal)
Active
UNE-EN 12211
UNE-EN 12210
UNE-EN 1026
UNE-EN 12207
UNE-EN 14608
+ 3 more
EOLIA
Active
DIN EN 12469
NF S 90-351
NF X 44-201 (Octobre 1984) pour PSM
BS EN ISO 14644-1:2015
ISO 14644-3
Railway brake — anti-slide device (UIC 5
Railway brake — magnetic track brakes (U
Railway brakes — conditions for homologa
Railway brakes — disc brake pads (UIC 54
− Durchfluss von Gasen
+ 3 more
EPTA NORD
Active
DIN CEN ISO 15216-2
ISO 19250
AOAC 2012.01 2016
DIN EN ISO 15587-1
EPA 300.1 1997
+ 3 more
UNE-EN ISO 6892-1
DIN EN 10002-1
ASTM E 8
ASTM E 208
ASTM E208-06
+ 3 more
ERC Testing
Active
DIN EN 1863-1
BS EN ISO 10077-1:2006
published 2024) for BS EN
DIN EN 1863-2
BS EN ISO 10077-2:2017
+ 3 more
ERGO Umweltinstitut
Active
DIN ISO 10381-5
DIN ISO 18400-102
DIN ISO 18400-104
DIN ISO 18400-105
DIN ISO 18400-203
+ 3 more
ETAS
Active
- Gleichspannung
Quellen und Messgeräte > 1 mV bis
> 10 mV bis
> 100 mV bis
> 10 V bis
+ 3 more
DIN EN ISO 6888-1
0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN ISO 16649-2
DIN EN ISO 19020
+ 3 more
NF X 43-269
NF X 43-050
NF X43-050 (parties utiles de la
NF X 46-032
NF X46-031
NF X 43-269 – Annexe K
NF X 43-050
NF X43-050 (parties utiles de la
NF X43-050 (parties utiles de
NF X 43-050
NF X 43-269 - Annexe K
NF EN 14346 –
NF X43-050 (parties utiles de la
NF X 43-269 – Annexe K
NF X 43-050
NF X 43-269 - Annexe K
NF X43-050 (parties utiles de la
NF X 43-269 - Annexe K
NF X 43-269 – Annexe K
NF X 43-050
NF X43-050 (parties utiles de la
NF X43-050 (parties
+ 1 more
NF X 43-269 - Annexe K
NF X 43-269 – Annexe K
NF X 43-050
NF X43-050 (parties utiles de la
NF ISO 21363
UNE 64106
BS ISO 6731:2010
UNE-EN ISO 712
UNE-EN ISO 5534
ISO 13580
+ 3 more
UNE-EN ISO 10304-3
UNE-EN ISO 10304-1
UNE-EN ISO 6878
UNE-EN 1484
SM 10200 H
+ 3 more
EUROFINS HYDROLOGIE NORD
Active
NF T90-111
DIN EN ISO 14403-2
NF T 90-412
DIN EN ISO 7899-1
NF-T 90-029
+ 3 more
UNE 77061
UNE-EN ISO 15681-2
SM 4500-NH3 F
UNE-EN ISO 8467
UNE-EN ISO 6878
+ 3 more
EUROFINS LABORATOIRE CENTRE
Active
DIN EN ISO 21528-2
DIN EN ISO 6888-1
0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN ISO 16649-2
+ 3 more
DIN ISO 11665-4
DIN EN ISO 7932
DIN 53483-2
DIN EN ISO 15213-2
NF V08-050
+ 3 more
No matching labs found.