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 126–150 of 345 labs
Envirocare Midlands
Active
(HSG 248) – 2021
SOP/11, based on HSG 248
(PCM) based on HSG 248
(HSG 248) – 2021
DIN EN 12457-2
3.02 based on HSG 248
staining based on HSG 248.
(PCM) based on HSG 248
Environmental Essentials
Active
(HSG 248) – 2021
TP003 based on HSG 248
(PCM) based on HSG 248
TP002 based on HSG 248
Appendix 5 of HSG 227 (2004)
+ 1 more
Environmental Services
Active
(HSG 248) – 2021
(PCM) based on HSG 248
SP1 based on HSG 248
(HSG 264, 2012)
and Appx. 3 of HSG 227 (2004))
Executive guides HSG 264 (2012)
Envirosafe Testing
Active
(HSG 248) – 2021
SOP 3 based on HSG 248
(PCM) based on HSG 248
Essex Asbestos Testing
Active
(HSG 248) – 2021
(PCM) based on HSG 248
TP03 based on HSG 248
Eton Environmental Group
Active
(HSG 248) – 2021
TP005, based on HSG 248
(PCM) based on HSG 248
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
Fibre Clear Consulting
Active
M002based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
Fluke Precision Measurement
Active
Frequenc 220 mV range
FREQUENCY
10 Hz to 100 kHz
difference from 10 % to 100 % of the sta
6105A control 0° to 360°
+ 3 more
No matching labs found.