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
🇮🇹
UNI EN ISO 11821
🇪🇸
UNE EN ISO 11821
🇳🇱
NEN EN ISO 11821
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DIN EN ISO 3095
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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
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Showing 101–125 of 1,273 labs
(HSG 248) – 2021
QOP03 based on HSG 248
(PCM) based on HSG 248
(PCM) based on HSG 248)
QOP01 based on HSG 248
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Asbestos Solution Providers
Active
(HSG 248) – 2021
(PCM) based on HSG 248
(HSG 264, 2012)
Asbestos Survey & Management
Active
QOP03 based on HSG 248
QOP01 based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
Ashcroft Instruments
Active
Absolutdruck p abs 0,015 bar
> 2 bar
> 42 bar
Absolutdruck Pabs
1 bar; 2 bar
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Aspect Quality
Active
DIN 55635
VDE 0468-2-14
VDE 0468-2-1
VDE 0468-2-5
DIN EN 60068-2-30
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AstraZeneca UK
Active
DC CURRENT
AC VOLTAGE (continued)
AC CURRENT
AC Voltage
DIMENSIONAL
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Analysts’ Guide (HSG 248)
(HSG 248) – 2021 Asbestos: The
(PCM) based on HSG 248
Conformity assessment — requirements for
Druckkraftrichtung
Drehmoment 0,01 N∙m
Drehmomentaufnehmer *
Drehmomentmessgeräte *
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Ayerst Environmental
Active
(HSG 248) – 2021 )
(PCM) based on HSG 248
Surveying) based on HSG 248
BARLOVENTO APPLUS+
Active
IEC 61400-11:2012/ AMD:2018
IEC 61400-12-2
IEC 61400-50-2
IEC 61400-12-1
IEC 61400-12-3
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DIN 52186
ISO 21527-1
DIN EN ISO 527-3
IEC 61924-2
DIN EN 62233
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BIOQUALITA' SRL
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0,2 0,003 bis 0,006
(HLA DQ8 (HLA DQB*03:02)
ISO 18787
BS EN 15662
DIN EN ISO 6888-1
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BIOTECNAL
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UNE-EN ISO 6579-1
UNE-EN ISO 6222
UNE-EN 26777
UNE-EN ISO 7027-1
en 31-7-79 (BOE 29-08-79)
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