Scope
ISO 3381:2013 / EN ISO 3381
Railway Interior Noise Measurement
ISO 3381 specifies standardized measurement procedures for determining sound pressure levels inside railbound passenger and freight vehicles under operating conditions. This test assesses passenger comfort, crew exposure, and compliance with occupational and environmental noise limits within train cabins and compartments. Manufacturers, operators, and occupational health consultants use these measurements to evaluate cabin acoustic quality, design noise control improvements, and ensure regulatory compliance. Accreditation guarantees consistent, defensible interior noise assessments that support both passenger safety and worker health protection.
What it measures
- A-weighted sound pressure level inside vehicle (dB(A))
- Noise levels at driver/operator positions
- Frequency analysis of interior noise (1/3 octave bands)
- Sound exposure level during typical operation
- Noise at passenger seating areas
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DIN EN ISO 3095
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BS EN ISO 3095
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NF EN ISO 3095
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UNI EN ISO 3095
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UNE EN ISO 3095
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NEN EN ISO 3095
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DIN EN ISO 14837-1
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BS EN ISO 14837-1
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NF EN ISO 14837-1
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UNI EN ISO 14837-1
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UNE EN ISO 14837-1
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NEN EN ISO 14837-1
1,273
Accredited labs
15
Countries
Showing 876–900 of 1,273 labs
Rhopoint Metrology
Active
(Steel and tungsten carbide)
LENGTH (cont’d)
pneumatic tyres (See Note 1)
LENGTH (cont.)
Plain plug gauges (taper)
+ 3 more
Richard L Thomas Associates
Active
(HSG 264, 2012)
HSG 264 (2012) and Appx. 3 of
HSG 227 (2004))
Appendix 5 of HSG 227 (2004))
(HSG 248) – 2021
OP11 based on HSG 248
(PCM) based on HSG 248
OP04 based on HSG 248
Robert Koch-Institut
Active
Salmonellen
Salmonella enterica, Shigellen, Yersinie
Shigellen
Salmonella sv. Paratyphi
Neisseria meningitidis, Listeria
+ 3 more
Charpy impact test (ISO 148-1)
Salt spray / neutral salt fog test (ISO
elektronische Waagen
1) In den CMC sind die erweiterten Messu
DIN EN ISO 12185
DIN EN ISO 3405
DIN EN 13016-1
DIN EN ISO 20884
DIN EN ISO 20846
+ 3 more
Spinocerebelläre Ataxien
Bindegewebserkrankungen: ACTA2, COL1A1,
HD; Chorea Huntington
(Huntingtin-Gen)
Dentatorubrale-Pallidoluysiane
+ 3 more
Rwanda Standards Board
Active
ISO 6222
AM09 based on BS ISO 21527-1:
ISO 6579-1
ISO 4832
ISO 2171
+ 3 more
S.E. CARBUROS METÁLICOS
Active
0,03 · 10-2 mol/mol C < 0,3 · 10-2 mol
0,3 · 10-2 mol/mol C 1,1 · 10-2 mol/
1,1 · 10-2 mol/mol ≤ C < 26 · 10-2 mol/m
1,1 · 10-2 mol/mol ≤ C < 26 · 10-2 mol/m
9 · 10-6 mol/mol C < 75 · 10-6 mol/mol
+ 3 more
Durchfluss von 2 m3/h bis 800 rn3/h
− Durchfluss von Flüssigkeiten
Volumendurchfluss
dV/dt von
strörnenden
+ 3 more
SARIA
Active
AM-01 based on BS 4401:Part 1:
AM-32 based on BS 4401:Part 4:
AM-03 based on BS ISO 937:2023
AM-04 based on BS ISO
AM-31 based on BS EN ISO
+ 3 more
SATRA Technology Centre
Active
ISO 4931:1986 (withdrawn)
ISO 3759:1984 (withdrawn)
DIN EN 13759
DIN EN 12150-1
DIN EN ISO 15797
+ 3 more
(15 ± 1) ⋅ 10-6 mol/mol (1000 ± 50) ⋅ 10
(8 ± 0,5) ⋅ 10-2 mol/mol (1,4 ± 0,1) ⋅ 1
(3000 ± 150) ⋅ 10-6 mol/mol (9 ± 1) ⋅ 10
(80 ± 8) ⋅ 10-6 mol/mol
(100 ± 8) ⋅ 10-6 mol/mol
SEQUOPRO
Active
0,015 l/min ≤ Q ≤ 40 l/min
0,0 · 10-9 mol/mol
20 ⋅ 10-9 mol/mol ≤ C ≤ 500 ⋅ 10-9 mol/m
0,00 · 10-6 mol/mol
0,5 ⋅10-6 mol/mol ≤ C ≤ 10 ⋅10-6 mol/mol
+ 3 more
DIN EN ISO 12966-2
DIN EN 12266-2
DIN EN ISO 12966-4
DIN EN 13656
DIN 30660
+ 3 more
1 mg 2 mg 5 mg 10 mg 20 mg 50 mg 100 mg
10 g 20 g 50 g 100 g 200 g 500 g 1 kg 2
.1 mg 2 mg 5 mg 10 mg 20 mg 50 mg 100 mg
SGS Germany
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
DIN 51757
ASTM D 4052
DIN EN ISO 12185
DIN EN ISO 3405
DIN EN 13016-1
+ 3 more
No matching labs found.