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 576–600 of 1,273 labs
UNE 77324
ISO 23318
UNE 77325
ISO 10390
UNE 77308
+ 3 more
DIN EN 60335-2-51
DIN EN 60335-2-43
IEC 62054-21
IEC 60335-2-51
DIN EN 60335-2-99
+ 3 more
- 40 ˚C a 85 ˚C > 85 ˚C a 200 ˚C
- 25 ˚C a 85 ˚C
UNE-EN 124-5
UNE-EN ISO 945-1
UNE-EN 124-1
UNE-EN 124
UNE-EN ISO 15630-3
+ 3 more
8 mT/A ≤ B/I < 500 mT/A
80 mT ≤ B ≤ 1,1 T
0,2 mT ≤ B < 1,1 T
0 mT ≤ B < 80 mT
10 Wb < 0,2 Wb
+ 2 more
CEM DI-021
CEM DI-008
EURAMET CG-10
CEM DI-005
EURAMET CG-6
+ 2 more
3,5 kPa P 70 kPa 70 kPa < P 700 kP
3,5 kPa P 2,0 MPa 2,0 MPa < P 7,0
3,5 kPa P 20 kPa 20 kPa < P 70 kPa
100 kPa P 6,1 MPa 6,1 MPa < P 100
100 kPa P 70 MPa
+ 3 more
nach DIN EN ISO 3650:1999
EURAMET CG-6
ISO 5436-1
CEM DI-013
CEM DI-012
+ 3 more
UNE-EN ISO 10704
UNE-EN ISO 10703
EPA 903.0
EPA 909.0
ISO 13161
+ 3 more
CEM DI-025
CEM DI-018
UNE-EN ISO 21920-3
CEM DI-009
CEM DI-003
+ 3 more
UNE-EN ISO 7887
UNE-EN ISO 17852
UNE-EN ISO 8467
ISO 7150-1
SM 2510 B
+ 3 more
LABORATORIOS EYCO
Active
ISO 5-3
ISO 2813
UNE-EN ISO 9342-1
UNE-EN ISO 8598-1
ISO 3664
+ 3 more
LABORATORIOS OMEGA
Active
UNE 10523
UNE 27888
UNE 7027-1
ISO 23695
UNE-EN ISO 9308-1
+ 3 more
UNE-EN 7027-1
UNE-EN ISO 10523
SM 2520 B
UNE EN 27888
UNE-EN 872
+ 3 more
LADR GmbH MVZ Nord-West
Active
10-Hydroxycarbazepin (MHD)
Amiodaron, Desmethylamiodaron
Clozapin, Norclozapin
Cyclosporin A
Amiodaron, Desethylamiodaron
+ 3 more
HbA1c
Basophile
Eosinophile
Erythrozyten
Hämatokrit
+ 3 more
HbA1c
HCG qualitativ
Erythrozyten
Granulozyten basophil
Granulozyten eosinophil
+ 3 more
HbA1c
Retikulozyten
Leukozyten
Kleines Blutbild
Großes Blutbild =
+ 3 more
HbA1c
Zellzahl
Blutbild groß
Blutbild klein
Retikulozyten
+ 3 more
Thrombozytenfunktionstest
2-Desoxypipradol (2-DPMP)
2-oxo-3-hydroxy-LSD
3.4-DMMC
3-Fluormethcathinon
+ 3 more
HbA1c
Basophile Granulozyten
Eosinophile Granulozyten
Erythrozyten
Hämatokrit
+ 3 more
Liste aller Untersuchungsverfahren
Webpräsenz des Medizinischen Laboratoriu
HbA1c
Basophile
Eosinophile
+ 3 more
HbA1c
Retikulozyten
Leukozyten
Neutrophile Granulozyten
Lymphozyten
+ 3 more
LADR MVZ Recklinghausen e
Active
Blutsenkung
Benzol
Ethylbenzol
Aceton, Isopropanol, Methanol
Ethanol
+ 3 more
Blutsenkung
Benzol
Ethanol
Ethylbenzol
Aceton, Isopropanol, Methanol
+ 3 more
No matching labs found.