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
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15
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Showing 26–50 of 1,273 labs
UNE 10523
UNE 27888
UNE 7027
ISO 15923-1
SM 3500
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UNE-EN ISO 7932
ISO 15213-1
ISO 21528-2
DIN EN ISO 6579-1
ISO 22964
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SM 3111
SM 5220 D
SM 2130 B
SM 2520 B
SM 2510 B
+ 3 more
UNE-EN ISO 8467
SM 4500-H+ B
UNE-EN ISO 7027-1
ISO 15923-1
UNE-EN 25663
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AGRUPA LABORATORIO, S.L.L.
Active
SM 2540 F
SM 2130 B
EPA 8270
UNE-EN ISO 8467
UNE-EN ISO 5815-1
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AGÉNCIA CATALANA DE L´AIGUA
Active
SM 4500 H+
UNE EN 27888
SM 2130 B
UNE-EN 77059
UNE-EN 1484
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UNE 137001
UNE 49706
UNE-EN ISO 2234
UNE-EN ISO 12048
UNE-EN ISO 2244
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AIP
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Railway brake — anti-slide device (UIC 5
Railway brake — magnetic track brakes (U
Railway brakes — conditions for homologa
Messgeräte im Kraftfahrwesen
− Abgasmessgeräte für Fremdzündungsmotor
+ 3 more
AISICO
Active
DIN EN 1793-5
ASTM E 415 21
DIN EN 14726
DIN EN 1794-1
DIN EN 1794-2
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IEC 61000-4-2: 2008
VDE 0847-4-2
IEC 61000-4-3: 2006
VDE 0847
IEC 61000-4-4: 2012
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AL-PRO
Active
IEC 61400-12-1 *
IEC 61400-12-5 *
IEC 61400-50 *
IEC 61400-50-1 *
IEC 61400-50-2 *
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ALS France – Site de Paris
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NF T 90-412
0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
DIN EN ISO 16649-3
DIN EN ISO 6888-3
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ALS Laboratories (UK)
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on BS 4401:Part 3:1970(1986)
ISO 12966-2
AM/C/108 based on BS EN ISO
BS 684 2.14:2001
BS EN 288-Part 9 :1999
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ALSTOM Transportation Germany GmbH Prüfstelle für eisenbahntypische Prüfungen an Schienenfahrzeugen
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DIN 27201-5
DIN 25043-1
DIN 25043-2
DIN EN 13272
DIN EN 13272-1
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IEC 60068-2-1
IEC 60068-2-2
UNE-EN 60068-2-14
UNE-EN 60068-2-78
IEC 60068-2-6
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APAVE EXPLOITATION FRANCE
Active
DIN EN 14385
ETSI EN 301 489-1 V2.2.3 2019-11
NF X43-551
IS EN 1948-1:2006 2006
DIN EN 14789
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APAVE INSPECTION SPAIN
Active
UNE-EN 14584
UNE-EN 13554
UNE-EN 12819
UNE-EN 12817
UNE-EN ISO 15614-1
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APEC Environmental
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QOP03 based on HSG 248
QOP01 based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
CEM DI-002
EURAMET CG-2
CEM DI-014
CEM DI-006
CEM DI-016
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ISO 6059
ASTM D 1209
UNE-EN ISO 8467
SM 4500-NH D 3
UNE 77048
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ISO/IEC 25010
ISO/IEC 25040
ISO/IEC 25012
ISO/IEC 5259-2
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