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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DAkkS D-PL-11239-01-05 Chemnitz, DE
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DIN ISO 11466 UNE-EN 12880 ÖNORM EN 12457-4 ISO 10523 DIN EN 27888 + 3 more
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TAK CERT

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DAkkS D-K-20800-01-01 Bonn, DE
− Scheinwerfer-Einstell-Prüfsystem − Abgasmessgeräte für Fremdzündungsmotor − Abgasmessgeräte für Kompressionszündun Railway brake — magnetic track brakes (U nur Vor-Ort-Kalibrierungen + 3 more
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TC Laser

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DAkkS D-PL-22493-01-00 Eppertshausen, DE
DIN EN 50689 VDE 0837-689 DIN 56912 DIN EN 60825-1 VDE 0837-1 + 3 more
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DAkkS D-K-15024-01-01 Heusweiler, DE
- Gleichspannung / Messgeräte 0,1 mV > 220 mV > 2,2 V + 3 more
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DAkkS D-K-15097-01-01 Pinneberg, DE
Elektrische Messgrößen Gleichstrom- und Niederfrequenzmessgröße Railway brake — magnetic track brakes (U − Gleichspannung − Gleichstromstärke + 3 more
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TIRA

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DAkkS D-K-17684-01-00 Schalkau, DE
Kraft (WPM) Kraftmesseinrichtungen von Werkstoffprüfmaschinen Acoustics — tonality assessment (DIN 456 Länge (WPM) + 3 more
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DAkkS D-K-11048-01-02 Darmstadt, DE
Railway braking — thermal analysis (EN 1 Railway — traction effort and braking fo Railway vehicle dynamics — on-track test Railway brake disc acoustic emissions (E Railway wheel squeal and curve noise (EN + 3 more
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DAkkS D-ML-14063-01-00 München, DE
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DAkkS D-PL-14063-03-00 München, DE
ISO 15835-2 DIN EN ISO 6506-1 DIN EN ISO 15630-1 DIN EN ISO 15630-3 IEC 62301 + 3 more
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DAkkS D-K-22502-01-01 Ilmenau, DE
& 2: 2008 Leuchtdichte L / vom Typ L3 Standard Normfarbwertanteile x , y / LED-basierte Farb- und + 3 more
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DAkkS D-K-18197-01-00 Martinroda, DE
Taupunkttemperatur Railway braking — urban guided transport Widerstandssensor –40 °C bis > 5 °C bis + 3 more
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Teramess

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DAkkS D-K-18666-01-02 Germering, DE
Absolutdruck p 0,015 bar abs > 1,7 bar > 70 bar > 100 bar + 3 more
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DAkkS D-K-18316-01-00 Backnang, DE
Gleichspannung 0 mV Messgeräte 10 mV Wechselspannung 0,22 mV > 220 mV > 2,2 V + 3 more
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DAkkS D-K-22318-01-00 Neu Wulmstorf, DE
Positiver Überdruck p e > 70 bar Überdruck p (ein- oder mehrgängige
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DAkkS D-K-15070-01-01 Kirchzarten, DE
- Gleichspannung / Messgeräte Quellen Hochspannung - Gleichstromstärke + 3 more
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DAkkS D-K-17589-01-01 Steinenbronn, DE
Railway brakes — disc brake pads (UIC 54 Volumendurchfluss bzw. 0,01 m Railway pantographs — requirements for m 39 mL/h + 3 more
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DAkkS D-K-17616-01-01 Langenselbold, DE
- Gleichspannung Messgeräte 0,001 V bis 0,33 V bis 3,3 V bis 330 V bis + 3 more
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DAkkS D-K-18223-01-02 Ilmenau, DE
Masse oder Konventioneller Wägewert/ Massenormal *) > 1 mg + 3 more
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DAkkS D-K-17246-01-00 Berlin, DE
Railway brake — magnetic track brakes (U Kraft (WPM) Länge (WPM) a) nur Vor-Ort-Kalibrierungen Vickers hardness test (ISO 6507) + 3 more
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Trescal

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DAkkS D-K-15015-01-01 Darmstadt, DE
- Gleichspannung / Messgeräte 10 V; 100 V; 1000 V > 100 mV > 0,22 V + 3 more
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DAkkS D-PL-12007-02-05 Essen, DE
IEC 61000-4-39 IEC 61000-4-3: 2006 VDE 0847-4-3 IEC 61000-4-4: 2012 VDE 0847-4-4 + 3 more
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DAkkS D-K-11109-01-02 Essen, DE
positiven Überdruck positiver Überdruck - Gleichstromstärke Kraft Schließ- und + 3 more
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DAkkS D-PL-11109-01-06 Essen, DE
ISO 26262-2 ISO 26262-3: ISO 26262-4 ISO 26262-5 ISO 26262-6 + 3 more
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DAkkS D-PL-11074-07-01 Essen, DE
DIN EN 10306 DIN EN 1048 DIN EN 1216 DIN EN 14511-3 DIN EN 14825 + 3 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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