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 176–200 of 1,516 labs
Vickers hardness test (ISO 6507)
Temperatur *
Temperaturmessgrößen −35 °C
Railway braking — urban guided transport
Temperatur −40 °C
+ 3 more
Hämoglobin
Differentialblutbild
Erythrozyten
Großes Blutbild
Kleines Blutbild
+ 3 more
Okkultes Blut
Großes Blutbild
Kleines Blutbild
Retikulozyten
Thrombozyten
+ 3 more
2C-B
2C-I
3-Hydroxy-Bromazepam
5-Hydroxyindolessigsäure
6-Acetylcodein
+ 3 more
Zelldifferenzierung
Erythrozyten
Großes Blutbild
Hämoglobin
Kleines Blutbild
+ 3 more
Hämoglobin (immunologisch)
CA 125
CA 15-3
CA 19-9
CA 72-4
+ 3 more
Hämoglobin
Natriumchlorid
Kalium
Natrium
Eiweißelektrophorese: Albumin, Alpha-1-G
+ 3 more
10-OH-Carbazepin
11-Deoxycortisol
17-OH-Progesteron
21-Deoxycortisol
25-OH Vitamin D2
+ 3 more
Thrombozytenfunktion
5-Hydroxyindolessigsäure
Adrenalin
Amiodaron, Desmethylamiodaron
Carbohydrate-deficient
+ 3 more
Bioscientia MVZ Labor Saar
Active
Lamotrigin
Metanephrine, Normetanephrine
Erythrozyten
Aripiprazol
Lymphozyten
+ 3 more
Birmingham City Council
Active
(HSG 248) – 2021 )
(PCM) based on HSG 248)
(PCM) based on HSG 248
staining based on HSG 248
(HSG 264, 2012)
Bizerba SE &
Active
IEC 61000-4-2: 2008
IEC 61000-4-3: 2006
IEC 61000-4-4: 2012
IEC 61000-4-5: 2005
IEC 61000-4-6: 2013
+ 3 more
Black Forest Testlab
Active
DIN EN 61000-3
IEC 61000-3-2: 2014
IEC 61000-3-3
IEC 61000-3-11: 2017
IEC 61000-3-12: 2011
+ 3 more
staining based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
(HSG 264:2012)
Bridgend Asbestos Services
Active
(HSG 248) – 2021
P10.2 based on HSG 248
(PCM) based on HSG 248
British Engineering Services
Active
ÖNORM EN ISO 3452-1
BS 3923-1:1986(Withdrawn)
ASTM E165-23
BS 4124:1991(Withdrawn)
DIN EN 10228-3
+ 3 more
Based on ISO 10312:2019 and ISO
SOP 16 by XRD (ISO BS EN
IEC 60945
IEC 61162-1
IEC 61162-2
IEC 61162-450
IEC 61162-460
+ 3 more
Radioaktivität 50 Bq/m³
Radon-222-
100 Bq/m³
tration in Luft
200 Bq/m³
+ 3 more
DIN EN ISO 2808
DIN EN ISO 3219-2
DIN EN ISO 3838
DIN EN 933-1
DIN EN 933-4
+ 3 more
No matching labs found.