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
1,516
Accredited labs
17
Countries
Showing 201–225 of 1,516 labs
Conformity assessment — requirements for
Railway composite brake blocks — require
0,2 kN
0,4 kN
100 kN
+ 3 more
Bundesministerium der Verteidigung Bundeswehrkrankenhaus Berlin Abteilung XVI Laboratoriumsmedizin
Active
NRBC-Normoblasten
Anteil unreifer Retikulozyten
Erythrozyten
DELTA-He
Leukozyten
+ 3 more
Blutungszeit PFA ADP
Blutungszeit PFA EPI
PFA-P2Y
Erythrozyten
Hämatokrit
+ 3 more
Leukozyten
Enteroaggregative E. coli
Legionellen
Staphylokokkus aureus
Salmonellen
+ 3 more
DIN ISO 17289
DIN EN ISO 10523
DIN EN 27888
NF X 31-615 (Uniquement
EN IEC 61000-4
DIN EN IEC 61000
VDE 0847-4
DIN EN 55016-2
DIN EN IEC 61000-6
+ 3 more
C G C Laboratory
Active
(HSG 248) – 2021
(PCM) based on HSG 248
SOP 5, based on HSG 248
SOP 4, based on HSG 248
/ Messgeräte
Radiometrie 100 µW/cm²
stärkemessgeräte
UV-A 365nm
Linearität der
+ 3 more
Charpy impact test (ISO 148-1)
Salt spray / neutral salt fog test (ISO
Radiated emissions (CISPR 32)
verwendete Abkürzungen:
ETSI EN 301 489-1: V2.2.3
EN 61000-3-2 and EN 61000-3-3
IEC 61000-6-1
IEC 61000-4-4: 2012
1.4 Electrostatic Discharge EN 61000-4
+ 3 more
C.W.E. Services
Active
(HSG 264, 2012)
HSG 227 (2004))
Safety Executive guides HSG 264
(2012) and App 3 of HSG 227
(HSG 248) – 2021
+ 3 more
CAL
Active
DIN 38402-A 11
DIN 38402-A 12
DIN 38402-A 13
DIN ISO 5667-5 (A 14)
DIN EN ISO 5667-6 (A 15)
+ 3 more
DIN EN ISO 17294-2
DIN EN ISO 14403-2
DIN EN ISO 13395
VDE 414-9-11
DIN EN ISO 10304-1
+ 3 more
CANAGROSA LAB&SERVICES
Active
ISO 2808
ISO 48-4
UNE-EN ISO 2808
ISO 2409
UNE-EN ISO 2360
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CARTESY
Active
Tensile testing of metallic materials (I
Vickers hardness test (ISO 6507)
Kraft
Railway vehicles — specific test require
Railway — traction effort and braking fo
+ 3 more
CATAS SpA
Active
ISO 9308-1
ISO 7899-2
DIN EN ISO 11205
DIN EN ISO 10304-1
ISO 14189
+ 3 more
CEMAFROID - Site de Cestas
Active
DIN EN 13486
IEC
ISO 1496-2 – Conteneurs
DIN EN 16440-1
CENTRE SCIENTIFIQUE ET TECHNIQUE DU BATIMENT (CSTB) - Direction, Sécurité, Structures, Feu (DSSF)
Active
NF P 92-501
NF P92-512
EN 13823
EN ISO 1716
NF P 92-504
+ 3 more
DIN EN 1186-3
DIN EN ISO 7730
DIN EN 12457-2
DIN EN ISO 6888-1
DIN EN ISO 7393-2
+ 3 more
No matching labs found.