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
🇮🇹
UNI EN ISO 3095
🇪🇸
UNE EN ISO 3095
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NEN EN ISO 3095
1,516
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17
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Showing 326–350 of 1,516 labs
DNV Energy Systems Germany
Active
− Stromstärkeverhältnis
- Gleichspannung
/ Messgeräte
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Gleichstromstärke > 100 µA
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NF X 43-050
NF X43-050 (parties
ISO 22262-2
NF ISO 22262-1 et/ou
ISO 22262-1
NF X 46-032
NF X 43-050
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Faktor-V-Mangel (F5 inklusive
Thrombozyten, PAC-1 Bindung
CASQ2, KCNJ2, CALM2, CALM3, TECRL )
dbSNP r6027 )
Kardiomyopathie (PKP2, DSG2, SCN5A )
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aller Untersuchungsverfahren im flexible
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vWF-Multimere
Erythrozyten
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CD34+ Stammzellen
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Rh-Untergruppen
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DSA Daten- und Systemtechnik
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am Standort DSA Daten- und Systemtechnik
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Bremsmessgerät
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ASTM D 3227
DIN 3500
EN 14350-2
DIN EN 12350-9
DIN 53512
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(SPG42), SPAST (SPG4), SPG11, SPG7, VAMP
DIN EN 30-1-1
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Decus Research
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1) MS08P based on BS EN ISO
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Metrologic Group GmbH, nalen von:
Wernau, D
Neuss, D ≤ 1515 mm
Wetzlar, D
S.p.A., Turin, I
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ETSI EN 319 412
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ETSI EN 319 411-2
ETSI EN 319 411-1
DIN EN 60950-1
EN IEC 62368-1
DIN EN 60204-1
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DIN EN 61010-1
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DIN 31051
DIN EN 1005-1
DIN EN 1993-1-1
DIN EN 1993-1
DIN EN 1993-6
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IEC 60335-1: 2010
IEC 60335-2-29
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IEC 60335-2-65
DIN EN 60335-2-65
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DIN 4420-1
DIN 4420-3
DIN EN 61347-1
ISO 12117-2
DIN 53449
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VDE 0113-201
VDE 0113-202
DIN EN 60204-1
EN 61508-1:
VDE 0803-1
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ID136
DIN EN 137
100 C>T, 124 G>A, 137_138
> 140
Amyloid β 1-42
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DIN EN ISO 15106-3
DIN EN ISO 1522
DIN 30720-1: 2016-02
DIN 30720-2: 2009-10
DIN 30722-1: 2021-12
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