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 76–100 of 134 labs
(380 - 780 nm) 1 < R ≤ 100
0,01< DO ≤ 0,1 0,1 < DO ≤ 0,3 1,1 < DO <
DIN EN 1040
DIN EN 1656
DIN EN 14561
IEC 60127-6
DIN EN 13727
+ 3 more
CEM ME-003
EURAMET cg-17
CEM ME-010
Ground-borne noise and vibration from ra
UNE-EN ISO 16911-1
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UNE 320001
ISO/IEC 18045
ISO/IEC 15408
CEM ISO
ISO/IEC 24759
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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
UNE-EN ISO 27888
SM 2540
UNE-EN ISO 8467
UNE-EN ISO 7027-1
UNE-EN ISO 10523
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AOAC 995.11
UNE EN ISO 6869
AOAC 985.35
UNE-EN 17298
UNE 77324
ISO 23318
UNE 77325
ISO 10390
UNE 77308
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DIN EN 60335-2-51
DIN EN 60335-2-43
IEC 62054-21
IEC 60335-2-51
DIN EN 60335-2-99
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- 40 ˚C a 85 ˚C > 85 ˚C a 200 ˚C
- 25 ˚C a 85 ˚C
UNE-EN 124-5
UNE-EN ISO 945-1
UNE-EN 124-1
UNE-EN 124
UNE-EN ISO 15630-3
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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
CEM DI-021
CEM DI-008
EURAMET CG-10
CEM DI-005
EURAMET CG-6
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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
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nach DIN EN ISO 3650:1999
EURAMET CG-6
ISO 5436-1
CEM DI-013
CEM DI-012
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UNE-EN ISO 10704
UNE-EN ISO 10703
EPA 903.0
EPA 909.0
ISO 13161
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CEM DI-025
CEM DI-018
UNE-EN ISO 21920-3
CEM DI-009
CEM DI-003
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UNE-EN ISO 7887
UNE-EN ISO 17852
UNE-EN ISO 8467
ISO 7150-1
SM 2510 B
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LABORATORIOS EYCO
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ISO 5-3
ISO 2813
UNE-EN ISO 9342-1
UNE-EN ISO 8598-1
ISO 3664
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LABORATORIOS OMEGA
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UNE 10523
UNE 27888
UNE 7027-1
ISO 23695
UNE-EN ISO 9308-1
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UNE-EN 7027-1
UNE-EN ISO 10523
SM 2520 B
UNE EN 27888
UNE-EN 872
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No matching labs found.