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

Showing 101–125 of 799 labs

DAkkS D-ML-13219-01-00 Dresden, DE
Akkreditierungsbereich. Die Liste ist Erythrozyten Leukozyten Hämatokrit Thrombozyten + 3 more
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DAkkS D-ML-13461-01-01 Bad Kreuznach, DE
AB0-System Isoagglutinine (Serumeigenschaften) Rh-Merkmal D Rh-Untergruppen + 3 more
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DAkkS D-ML-13327-01-00 Hagen, DE
AB0-Blutgruppen-Merkmale Isoagglutinine (Serumeigenschaften) Rhesusmerkmale K-Merkmale + 3 more
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DAkkS D-K-20506-01-01 Aachen, DE
am Standort DSA Daten- und Systemtechnik Schreibendes Bremsmessgerät (HU-Adapter) Beschleunigung + 1 more
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DAkkS D-PL-14555-02-01 Karlsruhe, DE
ASTM D 3227 DIN 3500 EN 14350-2 DIN EN 12350-9 DIN 53512 + 3 more
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DAkkS D-PL-12098-01-01 Karlsruhe, DE
(SPG42), SPAST (SPG4), SPG11, SPG7, VAMP DIN EN 30-1-1 DIN EN 30-1-2 DIN 13013 DIN 13014 + 3 more
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DAkkS D-K-23327-01-01 Bad Camberg, DE
Metrologic Group GmbH, nalen von: Wernau, D Neuss, D ≤ 1515 mm Wetzlar, D S.p.A., Turin, I + 3 more
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DAkkS D-PL-17009-06-00 Wiesbaden, DE
DIN EN 60950-1 EN IEC 62368-1 DIN EN 60204-1 DIN EN 60825-1 DIN EN 61010-1 + 3 more
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DAkkS D-PL-17009-02-00 Mainz, DE
DIN 31051 DIN EN 1005-1 DIN EN 1993-1-1 DIN EN 1993-1 DIN EN 1993-6 + 3 more
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DAkkS D-PL-17009-07-02 Köln, DE
IEC 60335-1: 2010 IEC 60335-2-29 DIN EN 60335-2-29 IEC 60335-2-65 DIN EN 60335-2-65 + 3 more
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DAkkS D-PL-17009-09-01 München, DE
DIN 4420-1 DIN 4420-3 DIN EN 61347-1 ISO 12117-2 DIN 53449 + 3 more
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DAkkS D-PL-17009-02-01 Mainz, DE
VDE 0113-201 VDE 0113-202 DIN EN 60204-1 EN 61508-1: VDE 0803-1 + 3 more
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DAkkS D-PL-17009-29-02 Langenhagen, DE
ID136 DIN EN 137 100 C>T, 124 G>A, 137_138 > 140 Amyloid β 1-42 + 3 more
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DAkkS D-PL-17009-01-01 Hamburg, DE
DIN EN ISO 15106-3 DIN EN ISO 1522 DIN 30720-1: 2016-02 DIN 30720-2: 2009-10 DIN 30722-1: 2021-12 + 3 more
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DAkkS D-PL-17009-08-00 Mannheim, DE
DIN EN ISO 11357-4 IEC 61037 DIN EN ISO 13850 DIN EN ISO 13855 ISO 14119 + 3 more
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DAkkS D-PL-17009-34-00 Sankt Augustin, DE
DIN 58620: 2007-02 DIN 58621: 2011-10 DIN 58647-7: 1997-12 ID136 > 140 + 3 more
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DAkkS D-PL-18020-01-01 Varel, DE
IEC 61400-12 IEC 61400-12-1 IEC 61400-12-2 IEC 61400-12-3 IEC 61400-12-5 + 3 more
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DAkkS D-K-11170-01-00 Hamburg, DE
Railway brakes — conditions for homologa − Durchfluss von Flüssigkeiten − Strömungsgeschwindigkeit von Gasen − Widerstandsthermometer − Temperatur-Transmitter, Datenlogger + 3 more
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DAkkS D-ML-13068-01-00 Berlin, DE
ADP ASPI TRAP Amiodaron, Desethylamiodaron Mycophenolsäure + 3 more
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Diagenom

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DAkkS D-ML-18903-01-00 Rostock, DE
Chromosomensatz (angeboren) Chromosomensatz (erworben) Adrenogenitales Syndrom Angelman-Syndrom (15q11-Region, UBE3A) Mikrodeletionen; AZFa-c) + 3 more
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Diagnos MVZ

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DAkkS D-ML-21150-01-00 Berlin, DE
HbA1c Differentialblutbild, maschinell Retikulozyten, maschinell Kleines Blutbild Thrombozyten + 3 more
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DAkkS D-K-19516-01-00 Ansbach, DE
Volumen strömender 0,0005 m − Durchfluss von Flüssigkeiten 0,025 m Wasserzähler und 0,001 m Durchflusssensoren + 3 more
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DAkkS D-K-20015-01-01 Lahr, DE
Absolutdruck p * Vickers hardness test (ISO 6507) Flüssigkeitsvolumen * variablem Volumen aufnehmern sowie + 3 more
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DAkkS D-ML-13252-01-01 München, DE
Blutbild groß Thrombozyten Urinsediment Natrium Kalium + 3 more
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DAkkS D-ML-19642-02-00 Ronnenberg, DE
Aminosäureprofil Guanidinoacetat Kreatin Hämoglobinprofil Nitisinon (NTBC), Succinylaceton + 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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