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 101–125 of 134 labs
UNE-EN 12015
UNE-EN 50065-1
UNE-EN IEC 61000-6-4
UNE-EN IEC 61000-6-3
UNE-EN 61000-6-3
+ 3 more
10 · 10-6 mol/mol C 20 · 10-6 mol/mo
10 · 10-6 mol/mol C 5000 · 10-6 mol/
1 · 10-6 mol/mol C 10 · 10-6 mol/mol
1 · 10-6 mol/mol C 5 · 10-6 mol/mol
10 · 10-6 mol/mol C 100 · 10-6 mol/m
+ 3 more
MCV
Active
0,005 l/min ≤ Q ≤ 50 l/min
0,5 m3/h≤ Q ≤ 2,8 m3/h
0,6 m3/h Q 2,8 m3/h
20 m3/h Q 30 m3/h
30 m3/h < Q 70 m3/h
+ 3 more
METROCAL CALIBRACIÓN
Active
1 g 2 g 5 g 10 g 20 g 50 g 100 g 200 g 5
5 kg
10 kg 20 kg
100 kg 200 kg 500 kg 1000 kg
1 g 2 g 5 g 10 g 20 g 50 g 100 g 200 g 5
+ 2 more
2 · 10–6 mol/mol C 100 · 10–6 mol/mo
0,1 · 10–2 mol/mol < C 2,5 · 10–2 mol/
1 · 10–6 mol/mol C 100 · 10–6 mol/mo
5 · 10–6 mol/mol C 20 · 10–6 mol/mol
0,15 · 10–2 mol/mol C 20 · 10–2 mol/
+ 3 more
OCA GLOBAL
Active
UNE-EN 14385
UNE-EN 15259
UNE-EN 13211
BS ISO 9096:2017
UNE 77216
+ 3 more
UNE-EN 14363
UNE-EN 50367
UNE-EN 50317
UNE-EN 12663-1
(2,2 ± 0,1) ⋅ 10-2 mol/mol (99,5 ± 0,5)
(15 ± 5) ⋅ 10-6 mol/mol (100 ± 5) ⋅ 10-6
(7,5 ± 0,2) ⋅ 10-2 mol/mol (15 ± 0,5) ⋅
5 mV ≤ U ≤ 10 V 10 V < U ≤ 1000 V
45 Hz ≤ f ≤ 60 Hz 10 mV ≤ U ≤ 10 V 10 V
100 µA ≤ I ≤ 400 mA 400 mA < I ≤ 10 A 10
300 mA ≤ I ≤ 15 A
45 Hz ≤ f ≤ 60 Hz 100 µA ≤ I ≤ 400 mA 40
+ 2 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
(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
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
DIN EN 61010-2-010: 2015
DIN EN 60335-2-9
IEC 61000-4-8: 2009
IEC 61010-2-010: 2014
DIN EN 61010-2-101
+ 3 more
-95 kPa ≤ P < 0 kPa 0 kPa ≤ P ≤ 1 kPa 1
-95 kPa ≤ P ≤ -5 kPa - 5 kPa < P < -1 kP
(5 ± 0,2) · 10-2 mol/mol
(1000 ± 50) · 10-6 mol/mol
(15 ± 2) · 10-6 mol/mol
UNE-EN 12341
0,015 l/min ≤ Q ≤ 50 l/min
20 ⋅ 10-9 mol/mol ≤ C ≤ 500 ⋅ 10-9 mol/m
20 ⋅10-9 mol/mol ≤ C ≤ 100 ⋅ 10-9 mol/mo
100 ⋅ 10-9 mol/mol ≤ C ≤ 1000 ⋅ 10-9 mol
+ 3 more
THOR ESPECIALIDADES
Active
DIN EN 16615
DIN EN 17658
DIN EN 13697
IEC 60127-6
DIN EN 13727
+ 3 more
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