Nor103

Class 1 Sound level meter

The Nor103 is a compact Class 1 sound level meter for reliable, standards-compliant noise measurements in the field. It combines professional performance with true pocket-sized portability, making it ideal for occupational noise assessments, environmental noise surveys, and basic product noise testing.

With a wide dynamic range and Class 1 conformity to IEC 61672 and JIS C1509, it delivers the accuracy and traceability required for regulatory and internal compliance. Fast start-up and intuitive operation help you capture high-quality data quickly and efficiently

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Noise at work

Product noise testing

Environmental noise survey testing

General purpose noise level meter

Features

Standards

Specifications

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Features

Class 1 Sound Level Meter IEC 61672, JIS C1509-1
30 to 137 dB RMS, 60-140 dB Peak C without range switching
Measure Lp, Leq, Lmax, LE and LCpeak
Frequency range: from 10 Hz to 20 kHz
Frequency weighting: A and C
Time weighting: Fast / slow
Measurement durations: 1, 5, 10, 60 min.
Quick start up and easy operation

Standards

IEC 61672-1:2013 class 1
JIS C1509-1

Specifications

Standard compliance: Measurement Law IEC 61672-1:2013 class 1, CE mark (EMC Directive 2004/108/EC), WEEE Directive

Measurement functions: Instantaneous Sound level Lp, equivalent continuous sound level Leq,
Sound exposure level LE, Maximum sound pressure level Lmax
C weighting peak sound level LCpeak (when peak range is selected)

Microphone: 1/2-inch electret condenser microphone Model: UC-59

Sensitivity: -27 dB±2 dB (re.1 V/Pa)

Windscreen: Conforms to IEC 61672-1 Class 1 also with windscreen mounted
Measurement level range:

Wide range: A weighting: 30 dB to 137 dB, C weighting: 40 dB to 137 dB

Peak range: A weighting: 65 dB to 137 dB, C weighting: 65 dB to 137 dB
C weighting peak sound level: 68 dB to 140 dB

Inherent noise level:

Wide range: A weighting: 21 dB or less, C weighting: 29 dB or less

Peak range: A weighting: 54 dB or less, C weighting: 54 dB or less

Frequency range: 10 Hz to 20 kHz

Frequency weighting: A and C

Time weighting: F (fast) and S (slow)

RMS detecting circuit: Digital processing

Sampling frequency: 40 kHz

Numeric display: 0.1 dB resolution

Bar graph: 30-130dB, resolution 5 dB, display update cycle 0.1 s

Power: Uses 2 size LR03 (ANSI AAA) batteries

Current consumption: Approx. 90 mA (when operating at 3 V)

Environmental conditions: ÷10°C to 50°C, 10% to 90% RH (No condensation)

Dimensions: 130 mm (H) × 63 mm (W) × 23.5 mm (D)
Weight: 105 g (incl. batteries)

*Preamplifier is an integrated part of instrument. Use of extension cable is not possible.

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