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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Showing 51–75 of 134 labs
200 kg/h ≤ m ≤ 60000 kg/h
200 l/h ≤ Q ≤ 60000 l/h
200 kg/h ≤ m ≤ 30000 kg/h
200 l/h ≤ Q ≤ 30000 l/h
700 Pa ≤ P ≤ 2 MPa
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UNE-EN ISO 6892-1
DIN EN 10002-1
ASTM E 8
ASTM E 208
ASTM E208-06
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UNE 64106
BS ISO 6731:2010
UNE-EN ISO 712
UNE-EN ISO 5534
ISO 13580
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UNE-EN ISO 10304-3
UNE-EN ISO 10304-1
UNE-EN ISO 6878
UNE-EN 1484
SM 10200 H
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UNE-EN ISO 15681-2
SM 4500-NH3 F
UNE-EN ISO 8467
UNE-EN ISO 6878
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EXOLUM CORPORATION
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UNE-EN ISO 20884
UNE-EN ISO 12185
UNE-EN ISO 12156-1
ASTM D 93
ASTM D 2622
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CEM DI-013
UNE 17-710-78
FUNDACION TEKNIKER
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EURAMET CG-2
CEM DI-014
CEM DI-037
UNE-EN ISO 2178
UNE-EN ISO 16809
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UNE-EN 2557
UNE-EN 2002-001
ISO 6508-1
UNE-EN 2559
ASTM B557
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UNE-EN ISO 15350
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UNE-EN 10276-2
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3 mV U < 330 mV 0,33 V U < 3,3 V 3,3
0 mV U < 200 mV 200 mV U < 2 V 2 V
0 mV U 100 mV 0,1 V < U 1 V 1 V <
5 mV U 30 V
10 mV U < 33 mV 50 Hz f 1 kHz 1 kH
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9,8 L ≤ V ≤ 10,2 L (25 L/h ≤ Q ≤ 500 L/h
98 L ≤ V ≤ 104 L (250 L/h ≤ Q ≤ 5000 L/h
970 L ≤ V ≤ 1005 L (2500 L/h ≤ Q ≤ 20000
1305 L ≤ V ≤ 1350 L (5000 L/h ≤ Q ≤ 8000
2660 L ≤ V ≤ 2700 L (5000 L/h ≤ Q ≤ 1000
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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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
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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UNE-EN ISO 10704
UNE 73350-1
UNE 73311-5
ISO 11665-4
UNE 31010
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ITA
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IEC 61000-4-13: 2002
DIN EN 50121-3-2
IEC 61000-3-2: 2014
DIN EN 60601-1-2
IEC 61000-3-3
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IEC 61000-3-2: 2014
UNE-EN IEC 61000-3-2
UNE-EN 61000-3-2
UNE-EN IEC 61000-6-4
IEC 61000-3-3
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