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
1,516
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CeGaT
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angeborener Chromosomensatz
(Imbalancen im Genom, (Duplikationen/Del
SNRPN-Region 15q11-13 UPD15
(UBE3A)
SMN1; Spinale Muskelatrophie
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Cenata
Active
Pränatales Screening auf
Chromosomenstörungen
(Trisomie 21, Trisomie 18, Trisomie
13, X0, XXX, XXY, XYY, XXYY, 22q11 (DiGe
Chamois Metrology
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Calibration of pressure
Gas pressure (gauge)
Gas Pressure (Differential)
common mode pressure of 3.5
Hydraulic pressure (gauge)
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SNV, CNV/SV)
Thyreoidea stimulierendes
(TSH)
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Liquid-in-glass thermometers
ASTM D4052 (Digital density
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Leukozytenzahl
B-Zellzahl (Immunstatus
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HLA-DR
Leukozytensubpopulationen
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DIN 38402-A 13
DIN ISO 5667-5 (A 14)
DIN 38402-A 30
DIN 19643-1
ISO 5667-11
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Cirrus Research
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Sound Calibrators
Sound Level Meters
One-third octave band filters
(HSG 248) – 2021
SRV-002 based on HSG 248
(PCM) based on HSG 248
CoMech Metrology
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Chronic progressive external
Depth
Internal
Dial gauges and dial test
Caliper
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Coesfeld
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Kraft (WPM)
Belastungseinrichtungen von
Werkstoffprüfmaschinen
Länge (WPM) 0,5 mm
messeinrichtungen von
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simulation.
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digital and analogue
Compli Group
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DC CURRENT
DC Resistance
Oscilloscope Calibration
DC VOLTAGE
CAPACITANCE
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Messgeräte 0,001 V
> 0,22 V
> 2,2 V
> 11 V
> 22 V
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DIN EN 933-11
DIN EN 12390-3
DIN EN 933-3
DIN EN 12390-7
DIN EN 12697-5
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DC CURRENT
LENGTH
DC Resistance
DC VOLTAGE
Cold junction compensation
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Chloride
Potassium
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Differential Blood Count
White Blood Cell Count
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DIN EN 933-1
(PCM) based on HSG 248
(HSG 248) – 2021
DIN EN 932-1
DIN EN 932-2
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