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
1,273
Accredited labs
15
Countries
Showing 976–1,000 of 1,273 labs
Studenroth Präzisionstechnik
Active
− Parallelendmaße
− Durchmesser
− Längenmessmittel
Railway brake — magnetic track brakes (U
− Längenmessgeräte
+ 3 more
WBC (Leukozyten)
RBC (Erythrocyten)
HGB (Hb)
HCT (Hk)
PLT (Thrombozyten)
+ 3 more
Suchy Messtechnik
Active
Druck 50 mbar
Absolutdruck Pabs
> 1,3 bar
> 2,5 bar
> 0,6 bar
+ 3 more
Surrey County Council
Active
DIN EN 933-11
DIN EN 1097-6
DIN EN 1097-1
DIN EN 1097-2
DIN EN 933-3
+ 3 more
SysKal
Active
Hexagon Metrology Raumdiagonale von
GmbH, Wetzlar, D ≤ 1500 mm
Polyworks, Software von
InnovMetric, Lindau, D
PowerINSPECT, Software
+ 3 more
ISO 5-3
ISO 12647-1
ISO 13655
ISO 3074
DIN EN ISO 1833-4
DIN EN ISO 1833-5
DIN EN ISO 1833-6
DIN EN ISO 1833-7
+ 3 more
TAK CERT
Active
− Scheinwerfer-Einstell-Prüfsystem
− Abgasmessgeräte für Fremdzündungsmotor
− Abgasmessgeräte für Kompressionszündun
Railway brake — magnetic track brakes (U
nur Vor-Ort-Kalibrierungen
+ 3 more
- Gleichspannung
/ Messgeräte
0,1 mV
> 220 mV
> 2,2 V
+ 3 more
TERANA PUY-DE-DOME
Active
NF T 90-412
NF U47-101
DIN EN ISO 7899-1
DIN ISO 16649-2
DIN EN ISO 6888-2
+ 3 more
TES Time Elektronik Struck
Active
Elektrische Messgrößen
Gleichstrom- und Niederfrequenzmessgröße
Railway brake — magnetic track brakes (U
− Gleichspannung
− Gleichstromstärke
+ 3 more
THOR ESPECIALIDADES
Active
DIN EN 16615
DIN EN 17658
DIN EN 13697
IEC 60127-6
DIN EN 13727
+ 3 more
TIRA
Active
Kraft (WPM)
Kraftmesseinrichtungen von
Werkstoffprüfmaschinen
Acoustics — tonality assessment (DIN 456
Länge (WPM)
+ 3 more
DIN EN ISO 3596
DIN EN ISO 14780
BS ISO 18283:2022
DIN EN ISO 10893-6
DIN EN 61442
+ 3 more
UNE-EN ISO 868
ASTM D 2240
ISO 48-9
UNE 7050-3
UNE-EN ISO 10360-2
+ 3 more
TUV ITALIA SrL
Active
ETSI EN 301 489-1: V2.2.3
IEC 62109-1
DIN EN 50178: 1998
IEC 61000-4-16: 2015
IEC 62109-2
+ 3 more
TUV Rheinland Italia
Active
IEC 60335-2-51
DIN EN 60068-2-30
IEC 61000-6-1
IEC 60335-2-54: 2008
DIN EN 50564
+ 3 more
Technische Universität Darmstadt Staatliche Materialprüfungsanstalt Mess- und Kalibriertechnik
Active
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
No matching labs found.