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
1,516
Accredited labs
17
Countries
Showing 101–125 of 1,516 labs
Airtech Analysis
Active
(HSG 248) – 2021
(PCM) based on HSG 248
staining based on HSG 248
(HSG 264, 2012)
Appendix 5 of HSG 227 (2004))
Akkodis Germany EMC
Active
DIN EN IEC 61000-3
DIN EN 61000-3
IEC 61000-3-2: 2014
DIN EN IEC 61000
EN IEC 61000-4
+ 3 more
BS ISO 18283:2022
ASTM D2234 (location E)
ASTM D2013 (location B)
BS ISO 5074:2015; and
ASTM D409:2016
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Alleima
Active
DIN EN ISO 6506-1
ASTM E 10-18
DIN EN ISO 6508-1
ASTM E 18-22
DIN EN ISO 6507-1
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Allgäuer Messzentrum
Active
Durchmesser 1 mm
510 mm
Rundheitsabweichung 1 mm
Parallelitätsabweichung
Rundheitsabweichung
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Allied Aerosystems
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DC Resistance
2.92 mm systems (continued)
DC VOLTAGE
AC CURRENT
DC Power
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5-Fluorouracil-Toxizität (DPYD)
Cowden-Syndrom (PTEN)
Diffuses Magenkarzinom (CDH1)
Hereditärer Brust- und
Eierstockkrebs (HBOC), (BRCA1, BRCA2, CH
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Cyclosporin A
Everolimus
FK 506 (Tacrolimus)
Sirolimus
6-Methylmercaptopurin
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Fra(X)-Syndrom, FXTAS (FMR1)
Friedreich Ataxie (FXN)
DRPLA (ATN1)
Huntington Krankheit (HTT)
Huntington-like (TBP, JPH3)
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Aldosteron
11-Desoxycorticosteron
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17-Hydroxypregnenolon
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Amentum Clean Energy
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OM H-3 based on ISO 9698:2019
ISO 9696:2017 and ISO
(HSG 248) – 2021
(PCM) based on HSG 248
staining based on HSG 248.
Amentums Materials Testing and Research Laboratory part of Energy Safety and Risk Consultants (UK)
Active
a) BS 7270:2006
b) BS 3518-3:1963 (Withdrawn)
ASTM E1820-18ae1 (Withdrawn)
ISO 6892-2
BS EN ISO 204
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DIN 19698-1
DIN 19698-2
DIN EN ISO 54321
DIN EN 1744-3
DIN EN 12457-2
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Anchem Laboratories
Active
(HSG 248) – 2021
ANC/AS/2 based on HSG 248
DIN EN 14791
IEC 60519-11
DIN EN 13284-1
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Andersen Caledonia
Active
requirements of HTM 01-06 Part E
35 °C/3 days based on HTM 2030
Part E, WHTM 01-06 Part E & BS EN
ISO 15883-4 using R2A and
Part E, HTM 0106 Part E, WHTM 01-
+ 3 more
Applus Netherlands
Active
DIN EN 16407-1
BS EN ISO 10675-1
ÖNORM EN ISO 17636-1
NEN-EN 12732
ÖNORM EN ISO 17636-2
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As-Wägetechnik
Active
Charpy impact test (ISO 148-1)
Salt spray / neutral salt fog test (ISO
Radiated emissions (CISPR 32)
1) In den CMC sind die erweiterten Messu
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