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
🇩🇪
DIN EN ISO 11821
🇬🇧
BS EN ISO 11821
🇫🇷
NF EN ISO 11821
🇮🇹
UNI EN ISO 11821
🇪🇸
UNE EN ISO 11821
🇳🇱
NEN EN ISO 11821
🇩🇪
DIN EN ISO 3095
🇬🇧
BS EN ISO 3095
🇫🇷
NF EN ISO 3095
🇮🇹
UNI EN ISO 3095
🇪🇸
UNE EN ISO 3095
🇳🇱
NEN EN ISO 3095
1,516
Accredited labs
17
Countries
Showing 1,101–1,125 of 1,516 labs
DIN EN ISO 21528-1
DIN 53483-2
DIN EN ISO 21528-2
DIN ISO 11665-4
DIN EN ISO 16649-3
+ 3 more
ISO 18787
AM09 based on BS ISO 21527-1:
DIN EN ISO 11290-1
NF V04-408
0.95) based on BS ISO 21527-2:2008
+ 2 more
DIN EN ISO 21528-1
NF V08-401
DIN EN ISO 21528-2
DIN EN ISO 6888-1
DIN EN ISO 6888-2
+ 3 more
DIN EN ISO 21528-1
DIN EN ISO 21528-2
DIN EN ISO 6888-1
DIN EN ISO 6888-2
DIN ISO 16649-2
+ 3 more
Absolutdruck Pabs
> 0,05 bar
Negativer und
positiver Überdruck p
(ein- oder mehrgängige
+ 1 more
SKZ - Testing
Active
Bauart wie GR 1482
DIN ISO 48-4
DIN ISO 7619-2
DIN EN ISO 868
DIN EN ISO 2039-1
+ 3 more
IEC 61000-4-2: 2008
IEC 61000-4-3: 2006
DIN EN IEC 61000
IEC 61000-4-4: 2012
IEC 61000-4-5: 2005
+ 3 more
DIN EN ISO 11737-2
DIN 58953-6
DIN 1946-4
DIN EN 13959
DIN EN ISO 8536-4
+ 3 more
NF X 43-050
NF X 43-269
NF X 43-269 – Annexe K
NF X43-050 (parties utiles de la
DIN ISO 16000-3
+ 3 more
SMA Solar Technology
Active
IEC 61000-4-2: 2008
VDE 0847-4-2
IEC 61000-4-3: 2006
VDE 0847-4-3
IEC 61000-4-4: 2012
+ 3 more
DIN EN ISO 1833-13
DIN EN ISO 1833-14
DIN EN ISO 1833-16
DIN EN ISO 1833-17
DIN EN ISO 1833-18
+ 3 more
ISO 13737
NF ISO 22286
ASTM D 2137
NF F19-503
NF T60-190
+ 3 more
DIN EN ISO 10545-3
DIN EN 997
DIN EN ISO 10545-4
DIN EN ISO 10545-14
DIN EN ISO 10545-6
+ 3 more
SOCOTEC Asbestos
Active
(HSG 248) – 2021
SCI/ASB/003 based on HSG 248
(PCM) based on HSG 248
SCI/ASB/001 based on HSG 248
SOCOTEC ENVIRONNEMENT
Active
DIN EN 14385
ETSI EN 301 489-1 V2.2.3 2019-11
DIN EN ISO 21877
NF X 43-317
DIN EN 14181
+ 3 more
SOLVIAS FRANCE
Active
ISO 11737-3
DIN EN ISO 11737-2
NF EN 13824 (norme
BS EN ISO 11737-1:2018
SPS electronic
Active
- Gleichspannung
Messgeräte 1 mV
> 330 mV
3,3 V
Messgeräte 0,33 V
+ 3 more
Vibration measuring instruments — test m
Vibration measurements near traffic — me
Härteprüfmaschinen
Acoustics — tonality assessment (DIN 456
Noise measurement on railway vehicles —
+ 3 more
SYNLAB GHANA
Active
Alpha-Fetoprotein
Beta Human Chorionic Gonadotrophin
(BHCG), quantitative
CA 125
CEA
+ 3 more
SYNLAB MVZ Augsburg
Active
HbA1c
Bilirubin Kapillare
Ethanol (Blutalkohol)
Parvovirus-B19-IgG, -IgM
Salmonellen IgA
+ 3 more
Mycobacterium tuberculosis
Komplex
Mykobakterien
Obligat aerobe Aktinomyceten
Interferon-gamma nach
+ 3 more
HbA1c
Großes Blutbild
Kleines Blutbild
Retikulozyten
Natriumchlorid
+ 3 more
No matching labs found.