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
1,273
Accredited labs
15
Countries
Showing 251–275 of 1,273 labs
DIANOVIS
Active
Kleines Blutbild (maschinell)
Differentialblutbild (maschinell)
Thrombozyten
Retikulozyten
Natriumchlorid
+ 3 more
Gleichspannung 10 mV
Quellen > 100 mV
> 1 V
> 10 V
> 100 V
+ 3 more
ASTM C 1166
IEC 60512-16-7
ID168
IEC 60512-16-9
AK gegen Sc1-70
+ 3 more
DIPE ELECTRÓNICA
Active
0 mV U < 330 mV 330 mV U < 3,3 V 3,3
0 mV U < 120 mV 120 mV U < 1,2 V 1,2
0 A I 330 A 330 A < I 3,3 mA 3,
20 A I 1025 A
20 A I 1025 A F = 50 Hz
+ 3 more
SM 5210 D
UNE-EN ISO 27888
SM 5220 D
SM 2130 B
UNE-EN ISO 11885
+ 3 more
DKMS Life Science Lab g
Active
Antikörper FILA-Klasse I
Lymphozytäre Kreuzprobe
E, -DRB1, -DQB1, -DPB1, DRB3/4/5, -DQA1,
KIR
MICA, MICB, CCR5832
+ 3 more
HLA-Typsierung (HLA-B*27)
Azoospermiefaktor
(AZFa/AZFb/AZFc)
Chorea Huntington (HTT)
OMIM# 143100
+ 3 more
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
DNV Energy Systems Germany
Active
− Stromstärkeverhältnis
- Gleichspannung
/ Messgeräte
- Wechselspannung
Gleichstromstärke > 100 µA
+ 3 more
Faktor-V-Mangel (F5 inklusive
Thrombozyten, PAC-1 Bindung
CASQ2, KCNJ2, CALM2, CALM3, TECRL )
dbSNP r6027 )
Kardiomyopathie (PKP2, DSG2, SCN5A )
+ 3 more
aller Untersuchungsverfahren im flexible
Webpräsenz des Medizinischen Laboratoriu
(VWF:CB)
vWF-Multimere
Erythrozyten
+ 3 more
CD34+ Stammzellen
Erythrozyten
Hämoglobin
Leukozyten
Bakterien- und Hefezellen
+ 3 more
Akkreditierungsbereich. Die Liste ist
Erythrozyten
Leukozyten
Hämatokrit
Thrombozyten
+ 3 more
AB0-System
Isoagglutinine
(Serumeigenschaften)
Rh-Merkmal D
Rh-Untergruppen
+ 3 more
(Serumeigenschaften)
Dithiothreithol-Behandlung
Absorption oder Elution
HNA (1a, 1b, 1c, 2a, 3a, Antikörperscree
Liquorzelldifferenzierung
+ 3 more
DSA Daten- und Systemtechnik
Active
am Standort DSA Daten- und Systemtechnik
Schreibendes
Bremsmessgerät
(HU-Adapter)
Beschleunigung
+ 1 more
50 ∙ 10-9 mol/mol ≤ C ≤ 237 · 10-9 mol/m
30∙ 10-9 mol/mol ≤ C ≤ 500 ∙ 10-9 mol/mo
50 ∙ 10-9 mol/mol ≤ C ≤ 1000 · 10-9 mol/
50 ∙ 10-9 mol/mol ≤ C ≤ 237∙ 10-9 mol/mo
0,5 ∙ 10-9 mol/mol ≤ C ≤ 15 ∙ 10-9 mol/m
+ 1 more
ASTM D 3227
DIN 3500
EN 14350-2
DIN EN 12350-9
DIN 53512
+ 3 more
(SPG42), SPAST (SPG4), SPG11, SPG7, VAMP
DIN EN 30-1-1
DIN EN 30-1-2
DIN 13013
DIN 13014
+ 3 more
Decus Research
Active
1) MS08P based on BS EN ISO
MS02P based on BS EN ISO
MS03P based on BS EN ISO
MS06P based on BS EN ISO
MF07P based on BS EN ISO
+ 3 more
Metrologic Group GmbH, nalen von:
Wernau, D
Neuss, D ≤ 1515 mm
Wetzlar, D
S.p.A., Turin, I
+ 3 more
ETSI EN 319 412
ETSI EN 319 401
ETSI EN 319 411-2
ETSI EN 319 411-1
DIN EN 60950-1
EN IEC 62368-1
DIN EN 60204-1
DIN EN 60825-1
DIN EN 61010-1
+ 3 more
IEC 60335-1: 2010
IEC 60335-2-29
DIN EN 60335-2-29
IEC 60335-2-65
DIN EN 60335-2-65
+ 3 more
No matching labs found.