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
1,273
Accredited labs
15
Countries
Showing 301–325 of 1,273 labs
EMCCons RASEK
Active
- Gleichspannung
> 0,12 V
Vorverstärker > 1,2 V
> 12 V
> 120 V
+ 3 more
200 kg/h ≤ m ≤ 60000 kg/h
200 l/h ≤ Q ≤ 60000 l/h
200 kg/h ≤ m ≤ 30000 kg/h
200 l/h ≤ Q ≤ 30000 l/h
700 Pa ≤ P ≤ 2 MPa
+ 3 more
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
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
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
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
EUROFINS LABORATOIRE NORD
Active
DIN EN ISO 6888-1
DIN EN ISO 21528-2
DIN EN ISO 6888-2
DIN ISO 16649-2
NF V08-054
+ 3 more
DIN EN ISO 21528-1
NF V08-401
DIN ISO 16649-1
DIN EN ISO 6888-1
DIN EN ISO 21528-2
+ 3 more
NF X 43-269
NF X 43-050
ISO
ISO 16000-7
EXOLUM CORPORATION
Active
UNE-EN ISO 20884
UNE-EN ISO 12185
UNE-EN ISO 12156-1
ASTM D 93
ASTM D 2622
+ 3 more
Eckert & Ziegler Nuclitec
Active
Aktivität
20 Bq
> 20 Bq
Spezifische Aktivität
radioaktiver Lösungen 20 Bq·g
+ 3 more
Efectis Nederland
Active
ISO 5660-1
DIN EN 1365-1
EN 13381-4
DIN EN 1634-1
EN 1365-2
+ 3 more
Efectis UK/Ireland
Active
EN 1364-3
DIN EN 1366-4
EN 1364-4
BS 476-21
BS 476-22
+ 3 more
Elektro Struß
Withdrawn
Gleichspannung 30 mV
/ Messgeräte
> 0,33 V
> 3,3 V
> 33 V
+ 3 more
Elektro Wilhelm
Active
Taupunkttemperatur
für Widerstands- ˃ 500 °C
- Direktanzeigende Thermometer
Thermoelemente ˃ 500 °C
Widerstands- -50 °C
+ 3 more
No matching labs found.