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
🇩🇪 DIN EN ISO 11821 🇬🇧 BS EN ISO 11821 🇫🇷 NF EN ISO 11821 🇮🇹 UNI EN ISO 11821 🇪🇸 UNE EN ISO 11821 🇳🇱 NEN EN ISO 11821 🇩🇪 DIN EN ISO 3095 🇬🇧 BS EN ISO 3095 🇫🇷 NF EN ISO 3095 🇮🇹 UNI EN ISO 3095 🇪🇸 UNE EN ISO 3095 🇳🇱 NEN EN ISO 3095
1,516 Accredited labs
17 Countries

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MonTech Werkstoffprüfmaschinen GmbH Kalibrierlabor

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Mühlenkreiskliniken AöR Institut für Laboratoriumsmedizin, Transfusionsmedizin und Mikrobiologie

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Müller-BBM Building Solutions GmbH Akustisches Prüflaboratorium

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Müller-BBM Industry Solutions Prüflaboratorium

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DAkkS D-PL-14119-01-01 Planegg, DE
DIN 4150-1 DIN 4150-2 DIN 4150-3 DIN ISO 8297 DIN EN ISO 12354-4 + 3 more
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München Klinik gGmbH Medizet - Institut für Laboratoriumsmedizin und medizinische Mikrobiologie

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NATEC Sensors

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NEMKO

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Narda Safety Test Solutions

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Niedersächsisches Landesgesundheitsamt

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Normec Valitech

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Norsonic-Tippkemper

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ONNEKEN Meß- und Prüftechnik

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Druck 0,03 bar Absolutdruck Pabs > -0,3 bar > 3,0 bar > −0,02 bar + 3 more
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OPTOLUTION Messtechnik

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Oelze Präzisions-Meßzeugfabrik

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Railway brake — magnetic track brakes (U − Ebenheit − Geradheit − Winkelnormale auch als Vor-Ort-Kalibrierung + 3 more
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Ostthüringische Materialprüfgesellschaft für Textil und Kunststoffe mbH Rudolstadt (OMPG)

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DIN EN 1264-5 DIN EN 13647 DIN EN 71-10 DIN EN 50642 DIN EN ISO 14184-2 + 3 more
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PETROLAB GmbH Laboratorium für Mineralöl- und Umweltanalytik

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PHOENIX TESTLAB

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DAkkS D-PL-17186-01-01 Blomberg, DE
IEC 61000-4-2: 2008 IEC 61000-4-3: 2006 IEC 61000-4-4: 2012 IEC 61000-4-5: 2005 IEC 61000-4-6: 2013 + 3 more
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PID test & engineering

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DAkkS D-PL-21530-01-01 Sand am Main, DE
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PLANCO-TEC

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DAkkS D-PL-22217-01-00 Neu-Eichenberg, DE
DIN EN 12457-4 DIN EN 12579 DIN EN 13040 DIN EN ISO 10523 (C 5) DIN EN 12880 (S 2a) + 3 more
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PMK - GmbH (Prüfen+Messen+Kalibrieren)

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DAkkS D-K-17519-01-01 Niestetal, DE
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PROMESS Gesellschaft für Montage- und Prüfsysteme

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PTS - Institut für Fasern & Papier g

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DAkkS D-PL-23019-01-01 Heidenau, DE
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PTW - Freiburg Physikalisch-Technische Werkstätten Pychlau

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DAkkS D-K-15059-01-00 Freiburg im Breisgau, DE
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Pachmann

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DAkkS D-ML-13345-01-00 Bayreuth, DE
EpCAM-positive Zellen (CD326) EpCAM-positive Tumorsphären EpCAM-positive Zellen human epidermal growth receptor 2 (Her-2/neu) + 2 more
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Industries

Railway rolling stock manufacturing Train maintenance and depot operations Acoustic engineering and noise control HVAC and ventilation system design Brake system suppliers and integrators

Related Standards

  • ISO 11821 Acoustics — In-situ measurement of sound insulation of windows and façades
  • EN ISO 3095 Acoustics — Measurement of noise emitted by railbound vehicles
  • ISO 7235 Acoustics — Laboratory measurement of sound absorption coefficient of materials in impedance tubes

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