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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NBN EN ISO 11821
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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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NBN EN ISO 3095
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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
2,677
Accredited labs
20
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Showing 76–100 of 127 labs
Ground-borne noise and vibration from ra
DIN 54837
CEM ME-021
CEM TH-001
EURAMET cg-11
+ 3 more
ISO/IEC 15408
ISO/IEC 18045
UNE 320001
ISO/IEC 19790
ISO/IEC 24759
+ 2 more
KROMSCHROEDER
Active
Caudal m3/h 0,010 m3/h Q 250 m3/h 0,
Caudal m3/h 0,16 m3/h Q 2500 m3/h 0,
LABAQUA, S.A. (Unipersonal)
Active
Railway passenger ride comfort evaluatio
Railway wheel-rail interaction — roughne
ISO 21527-1
ISO 5667-11
ISO 17353
+ 3 more
AOAC 985.35
UNE EN ISO 6869
AOAC 995.11
UNE-EN 17298
ISO 10390
ISO 8968-1
BS ISO 6731:2010
ISO 23318
UNE 77308
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Salt spray / neutral salt fog test (ISO
Radiated emissions (CISPR 32)
DIN EN ISO 3650:1999
CA 15-3
DIN EN 50155
+ 3 more
UNE-EN ISO 6892-1
UNE-EN ISO 15630-1
UNE 36065
UNE-EN ISO 15630-2
UNE-EN ISO 945-1
+ 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
EURAMET CG-6
CEM DI-008
CEM DI-021
CEM DI-005
CEM DI-010
+ 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
ISO 13164-4
OM H-3 based on ISO 9698:2019
ISO 13161
ISO 18589-6
ISO 11665-4
+ 3 more
CEM DI-012
CEM DI-008
CEM DI-021
CEM DI-005
CEM DI-022
+ 3 more
Radiated emissions (CISPR 32)
Influenza A/H1-2009
ISO 4831
ISO 4832
ISO 21527-1
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LABORATORIOS EYCO
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ISO 5-3
ISO 2813
ISO 3864-4
UNE-EN ISO 9342-1
UNE-EN ISO 8598-1
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LABORATORIOS OMEGA
Active
ISO 23695
UNE-EN ISO 6222
UNE-EN ISO 16266
UNE-EN ISO 9308-1
UNE-EN ISO 7899-2
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DIN EN 15934
ISO 5667-11
ISO 13166
ISO 11083
DIN EN 12566-3
+ 3 more
Railway brake handbooks (UIC 547)
Railway braking — thermal analysis (EN 1
ISO 5660-1
DIN EN IEC 60068-2-52
IEC 61000-4-2: 2008
+ 3 more
10 · 10-6 mol/mol C 20 · 10-6 mol/mo
10 · 10-6 mol/mol C 5000 · 10-6 mol/
1 · 10-6 mol/mol C 10 · 10-6 mol/mol
1 · 10-6 mol/mol C 5 · 10-6 mol/mol
10 · 10-6 mol/mol C 100 · 10-6 mol/m
+ 3 more
MCV
Active
0,005 l/min ≤ Q ≤ 50 l/min
0,5 m3/h≤ Q ≤ 2,8 m3/h
0,6 m3/h Q 2,8 m3/h
20 m3/h Q 30 m3/h
30 m3/h < Q 70 m3/h
+ 3 more
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