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
🇳🇱
NEN EN ISO 3095
1,516
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17
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Showing 301–325 of 1,516 labs
CryptoNet Labs Srl
Active
ETSI EN 319 412
ETSI EN 319 401
ETSI EN 319 411-2
ETSI EN 319 411-1
Parallelendmaße * 0,5 mm
DIN EN ISO 3650:1999
auch Vor-Ort Kalibrierung
bahntypischer
–0,26 mm
+ 3 more
DIN EN ISO 9012
ISO 22967
ISO 22968
(SPG42), SPAST (SPG4), SPG11, SPG7, VAMP
DIN EN 30-1-1
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DECOM-UGK Werkzeugtechnik
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(ein- und mehrgängige
zylindrische Außen- und
metrischem Profil)
Außengewinde Nenndurchmesser
Flankendurchmesser 1 mm
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DEKRA Automobil
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DIN EN ISO 5667-3
DIN EN ISO 15587-2
DIN EN 12457-4
DIN EN 13346
DIN EN 13657
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DEKRA Certification
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DIN EN 60076-3
DIN EN 60076-10
DIN EN 60076-1
DIN EN 60076-4
DIN EN 60076-11
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UNE-EN 13284-2
UNE-EN 15259
UNE-EN 13284-1
UNE ISO 9096
UNE-EN 14181 (1)
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IEC 60335-1: 2010
IEC 60335-2-2
IEC 60335-2-3
DIN EN 60335-2-3: 2002
IEC 60335-2-4
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IEC 61730-2
IEC 61215-1-2
IEC 61215-2
IEC 61215-1-3
IEC 61215-1-4
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- Gleichspannung
Messgeräte > 330 mV
> 3,3 V
> 33 V
> 330 V
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Gas pressure (absolute)
Gas pressure (gauge)
Hydraulic pressure (gauge)
Hydraulic Pressure (absolute)
PRESSURE (cont’d)
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DIANOVIS
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Kleines Blutbild (maschinell)
Differentialblutbild (maschinell)
Thrombozyten
Retikulozyten
Natriumchlorid
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DILLINGER FRANCE
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NF EN ISO 6892-1 (méthode
DIN EN 10164
ASTM E 8
ASTM A 370
DIN EN ISO 6508-1
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Gleichspannung 10 mV
Quellen > 100 mV
> 1 V
> 10 V
> 100 V
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ASTM C 1166
IEC 60512-16-7
ID168
IEC 60512-16-9
AK gegen Sc1-70
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SM 5210 D
UNE-EN ISO 27888
SM 5220 D
SM 2130 B
UNE-EN ISO 11885
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DKMS Life Science Lab g
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Antikörper FILA-Klasse I
Lymphozytäre Kreuzprobe
E, -DRB1, -DQB1, -DPB1, DRB3/4/5, -DQA1,
KIR
MICA, MICB, CCR5832
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DM Calibration
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LENGTH
Blade type
Straight edges
Surface plates
External micrometer
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ID136
> 140
DIN EN 143
DIN EN ISO 21149
DIN EN 13274-1
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HLA-Typsierung (HLA-B*27)
Azoospermiefaktor
(AZFa/AZFb/AZFc)
Chorea Huntington (HTT)
OMIM# 143100
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DNKA
Active
staining based on HSG 248.
(PCM) based on HSG 248
(HSG 248) – 2021
QSOP 03 based on HSG 248
QSOP 01 based on HSG 248
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