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
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DIN EN ISO 11821
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BS EN ISO 11821
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NF EN ISO 11821
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UNI EN ISO 11821
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UNE EN ISO 11821
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NEN EN ISO 11821
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DIN EN ISO 3095
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BS EN ISO 3095
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NF EN ISO 3095
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UNI EN ISO 3095
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UNE EN ISO 3095
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NEN EN ISO 3095
1,273
Accredited labs
15
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Showing 451–475 of 1,273 labs
Hydrotechnik
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Negativer und
Positiver Überdruck p e
> 0,015 bar
Überdruck p
(ein- oder mehrgängige
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HygCen Germany
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DIN EN ISO 10993-1
DIN EN ISO 10993-5
DIN EN ISO 17405
ISO 10993-23
DIN EN ISO 10993-18
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Hygiene Nord
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DIN EN ISO 10993-5
DIN EN ISO 10993-1
DIN EN ISO 11737-2
DIN EN 1040
DIN EN IEC 60601-2-75
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Innen- und Tiefenmaße
Konventioneller
Wägewert/
Massenormale
Festkörpervolumen
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I2 Analytical
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staining based on HSG 248.
(HSG 248) – 2021
(PCM) based on HSG 248
A007B based on BS EN15051-2:2013 +1:2016
DIN EN 12457-3
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IDIADA AUTOMOTIVE TECHNOLOGY
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DIN EN 1385
EN 17092-1:2020
DIN EN ISO 5077
EN 1317-1
DIN EN ISO 13688
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HbA1c
Vitamin A
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Vitamin B6
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DIN EN 12143
DIN 53210
DIN EN 12373-4
DIN EN ISO 2812-1
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IFTS
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NF X 45-301
NF X 45-302
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ASTM F795-88
NF P 90-319 de 02/2011
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Thrombozytenaggregometrie
Drogen- und
Medikamentenscreening
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Linolensäure, Eicosapentaensäure
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ASTM F1978
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DIN EN ISO 4287
DIN EN ISO 4288
DIN EN ISO 5470-1
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Fettsäureprofil der
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DIN EN ISO 7932
DIN EN ISO 6579-1
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DIN EN ISO 11290-1
0.95) based on BS ISO 21527-2:2008
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IMQ SpA
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DIN EN 62053-23: 2017-09
DIN EN ISO 11816-1
IEC 62109-1
IEC 60598-2-2
DIN EN 62053-24
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INERCO INSPECCIÓN Y CONTROL
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UNE-EN 15259
UNE-EN 13284-1
UNE 77225
EPA 8
UNE 77227
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UNE-EN 15259
UNE-EN 13284-1
EPA 8
UNE-EN 13211
UNE-EN 14385
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UNE-EN 60404-14
0 mT ≤ B ≤ 75,7 mT (196 ± 3) mT (990 ± 4
3 mT ≤ B ≤ 300 mT 300 mT ≤ B ≤ 1600 mT
INOVALYS - Site de Nantes
Active
NF V 05-116
NF V 04-415
NF V 04-407
NF V04-403
NF V04-401
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Plasma, Serum, Plasma 0,5 mmol/L
Plasma, Serum, Plasma 50 mmol/L
Plasma, Serum, Plasma
Material
Urin
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DIN EN ISO 7932
DIN EN ISO 22964
NF V08-059
DIN EN ISO 6579-1
NF V08-036
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UNE-EN 12667
UNE-EN 14509
UNE-EN ISO 29470
UNE-EN 826
UNE-EN 1607
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INTA
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ISO 16063-21
EN 55016-1-6
CEM EL-025
UNE-EN ISO 376
UNE-EN ISO 7500-1
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