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
1,273 Accredited labs
15 Countries

Showing 451–475 of 714 labs

SMA Solar Technology

Active
DAkkS D-PL-12074-01-01 Niestetal, DE
IEC 61000-4-2: 2008 VDE 0847-4-2 IEC 61000-4-3: 2006 VDE 0847-4-3 IEC 61000-4-4: 2012 + 3 more
View Profile

SPS electronic

Active
DAkkS D-K-20497-01-01 Twist, DE
- Gleichspannung Messgeräte 1 mV > 330 mV 3,3 V Messgeräte 0,33 V + 3 more
View Profile

SSW Prüfsysteme und Service GmbH Weißberg

Active
DAkkS D-K-17475-01-00 Hilden, DE
Vibration measuring instruments — test m Vibration measurements near traffic — me Härteprüfmaschinen Acoustics — tonality assessment (DIN 456 Noise measurement on railway vehicles — + 3 more
View Profile

SYNLAB GHANA

Active
DAkkS D-ML-20424-01-00 Accra, DE
Alpha-Fetoprotein Beta Human Chorionic Gonadotrophin (BHCG), quantitative CA 125 CEA + 3 more
View Profile

SYNLAB MVZ Augsburg

Active
DAkkS D-ML-13225-01-01 Augsburg, DE
HbA1c Bilirubin Kapillare Ethanol (Blutalkohol) Parvovirus-B19-IgG, -IgM Salmonellen IgA + 3 more
View Profile

SYNLAB MVZ Hessen GmbH Standort Kassel

Active
DAkkS D-ML-20649-01-00 Kassel, DE
HbA1c Großes Blutbild Kleines Blutbild Retikulozyten Natriumchlorid + 3 more
View Profile

SYNLAB MVZ Leinfelden

Active
DAkkS D-ML-13123-01-01 Leinfelden-Echterdingen, DE
HS Omega3 Index Steroidprofil Albendazol Beta Carotin Coenzym Q10 + 3 more
View Profile

SYNLAB MVZ Weiden GmbH SYNLAB Medizinisches Versorgungszentrum Nürnberg

Active
DAkkS D-ML-13014-02-01 Nürnberg, DE
HbA1c Albumin Oestradiol 17ß Cortisol Salmonella spp. + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Augsburg

Active
DAkkS D-ML-13225-01-00 Augsburg, DE
HbA1c β-HCG Blutbild, automatisch Differentialblutbild, automatisch Hb-Äquivalent der Retikulozyten + 3 more
View Profile

SYNLAB MVZ Humangenetik München

Active
DAkkS D-ML-13225-07-00 München, DE
angeborener Chromosomensatz partieller angeborener partieller Chromosomensatz (zur Abklärung bekannter familiärer Chromosomenveränderung) + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Berlin

Active
DAkkS D-ML-13202-01-00 Berlin, DE
HbA1c Blutbild, maschinell Differentialblutbild, maschinell Zellzählung Retikulozyten, maschinell + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Ettlingen

Active
DAkkS D-ML-13095-01-00 Ettlingen, DE
RPR (Cardiolipin) Amiodaron, Desmethylamiodaron Clozapin, Norclozapin HbA1c Cyclosporin A, Everolimus, Sirolimus, Ta + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Hamburg

Active
DAkkS D-ML-21958-01-00 Hamburg, DE
Benzodiazepine Kokain Opiate Amphetamine THC + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Heidelberg

Active
DAkkS D-ML-13129-01-00 Eppelheim, DE
HbA1c Differentialblutbild Erythrozyten Hämatokrit Leukozyten + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Humangenetik Freiburg

Active
DAkkS D-ML-21093-01-01 Freiburg, DE
BTD PAH Prader-Willi-Syndrom (PWS) / (PWS)WS/Angelman-Syndrom (AS) Familiärer Brust- und Eierstockkrebs + 2 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Humangenetik Mannheim

Active
DAkkS D-ML-13293-01-00 Mannheim, DE
ABCC6 Pseudoxanthoma elasticum (PXE) Arterienkalzifikation, generalisierte in ABCC8 Hyperinsulinämische + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Jade-Weser

Active
DAkkS D-ML-18938-01-01 Varel, DE
HbA1c Differentialblutbild, maschinell Kleines Blutbild Retikulozyten, maschinell Zellzahl (Leukozyten, Erythrozyten) + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Trier

Active
DAkkS D-ML-13122-01-00 Trier, DE
Cardiolipin (CMT) HbA1c Basophile Eosinophile Erythrozyten + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Trier GmbH Zweigniederlassung SYNLAB Medizinisches Versorgungszentrum Neuwied

Active
DAkkS D-ML-13122-02-00 Neuwied, DE
HbA1c Kleines Blutbild Großes Blutbild Differentialblutbild Retikulozyten + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Weiden

Active
DAkkS D-ML-13014-01-00 Weiden, DE
Aceton, Isopropanol, Methanol Ethanol (Morphin, 6-Monoacetyl-morphin, Codein u Quantitative Bestätigungsanalyse Barbiturate (qualitative + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Weiden GmbH Medizinisches Versorgungszentrum Nürnberg

Active
DAkkS D-ML-13014-02-00 Nürnberg, DE
HbA1c Mittlere Blutglucose Aktivitätskonzentration Blutsenkung % Hyperchrome Erythrozyten + 3 more
View Profile

SYNLAB Medizinisches Versorgungszentrum Weiden GmbH Medizinisches Versorgungszentrum Thüringen

Active
DAkkS D-ML-13014-03-01 Jena, DE
5-Fluorouracil Unverträglichkeit: DPD Mutationen Exon 14 c.1905+1 G>A rs3918290, Exon 11 c.1236G>A rs56038477, Exon 13 c.1679T>G rs55886062, Exon 22 c.2846A>T + 3 more
View Profile

Saliger Gruppe

Active
DAkkS D-K-15008-01-01 Gladbeck, DE
Parallelendmaße 0,5 mm DIN EN ISO 3650:1999 Parallelendmaße aus Wolframkarbid nach Parallelendmaße aus 0,5 mm + 3 more
View Profile

Schwarzbeck Mess-Elektronik

Active
DAkkS D-K-20651-02-01 Schönau, DE
Antennenfaktor / aktive Stabantennen aktive Breitbandantennen Magnetische magnetische H-Feldsonden + 3 more
View Profile

Schütz + Licht Prüftechnik

Active
DAkkS D-K-15216-01-00 Langenfeld, DE
Kraft (WPM) Werkstoffprüfmaschinen Acoustics — tonality assessment (DIN 456 Länge (WPM) messeinrichtungen von + 3 more
View Profile

No matching labs found.

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

Other Test Methods

0 labs selected
Compare