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 351–375 of 1,273 labs
Eurofins Chemtest
Active
staining based on HSG 248.
(PCM) based on HSG 248
(HSG 248) – 2021
DIN EN 12457-2
DIN EN 12457-3
AC CURRENT
AC VOLTAGE (continued)
Measurement (continued)
DC CURRENT
Generation (continued)
+ 3 more
IEC 61000-6-1
IEC 61000-4-29: 2000
DIN EN 62233
IEC 61000-4-11: 2004
DIN EN 61000-4-12
+ 3 more
Eurofins Food Testing UK
Active
ISO 6579-1
ISO 6888-1
ISO 16649-2
ISO 11290-1
1) AM/M/11-2 based on BS EN
+ 3 more
Eurofins Food Testing UK
Active
Method 15.2 based on BS EN ISO
ISO 15213-2
Method 9.8 based on BS EN BS EN
Method 5.11 based on BS EN ISO
Method 4.3 based on BS EN ISO
+ 3 more
Eurofins Food Testing UK
Active
ISO 6579-1
ISO 4832
EUMM 3.03 based on BS EN
EUMM 3.07 based on BS EN ISO
BS ISO 21528-2:2017
+ 3 more
Eurofins Food Testing UK
Active
ISO 712
ISO 4833-1
on BS EN ISO 1736:2008
ISO 21528-2
BS ISO 4832:2006
+ 3 more
Thrombozytenfunktion
Agomelatin
Amisulprid (Psychopharmaka)
Amitriptylin (TZA)
Aripiprazol (Neuroleptika)
+ 3 more
Thrombozytenfunktion
Agomelatin
Amisulprid (Psychopharmaka)
Amitriptylin (TZA)
Aripiprazol (Neuroleptika)
+ 3 more
Glykohämoglobin A1C (HbA1c)
Basophile Granulozyten
Eosinophile Granulozyten
Erythrozytenverteilungsbreite
(RDW)
+ 3 more
Blutzellen
Basophile Granulozyten
Basophile Granulozyten, Eosinophile Gran
Eosinophile Granulozyten, Erythrozyten,
Basophile Leukozyten, absolut
+ 3 more
F.S. Fehrer Automotive
Active
DIN EN ISO 1798
DIN EN ISO 1856
Myopathie, Nemaline (TyP1, 3-10:
DIN EN ISO 14125
DIN EN ISO 179-1
+ 3 more
FCBA - Bordeaux
Active
DIN EN 947
ISO 24339
DIN CEN TS 15119-2
DIN EN ISO 3741
NF P 20-501
+ 3 more
Frequenz
- Gleichspannung
Spannungsquellen 5 µV
1 mV
Messgeräte > 10 mV
+ 3 more
FRAMATOME - Saint-Marcel
Active
DIN EN ISO 6507-1
DIN EN ISO 643
NF EN ISO 6520-1
DIN EN ISO 17639
NF EN ISO 6520-2
+ 3 more
CEM DI-013
UNE 17-710-78
FUNDACION TEKNIKER
Active
EURAMET CG-2
CEM DI-014
CEM DI-037
UNE-EN ISO 2178
UNE-EN ISO 16809
+ 3 more
UNE-EN 2557
UNE-EN 2002-001
ISO 6508-1
UNE-EN 2559
ASTM B557
+ 3 more
FUNDACIÓN IDONIAL
Active
ASTM E 415
UNE-EN ISO 15350
ASTM E 1086
UNE-EN 10276-2
UNE-EN ISO 15351
+ 3 more
ISO 6721-1
ISO 11357-5
ISO 6721-11
ISO 11357-1
ASTM E2602
+ 3 more
UNE-EN 772-20
UNE-EN 772-13
UNE-EN 772-1
UNE-EN 772-21
UNE-EN 772-3
+ 3 more
Abetalipoproteinämie (MTTP)
Achondroplasie (FGFR3)
Acoeruloplasminämie/Hypocoerulo
plasminämie (CP)
ACTH-unabhängige makronoduläre
+ 3 more
Fibre Clear Consulting
Active
M002based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
No matching labs found.