Sound level meter

NL-43

Class 2 Sound level meter

The NL-43 is a precision Class 2 sound level meter designed for reliable environmental and occupational noise measurements where a frequency range up to 8 kHz is sufficient. It offers the core functionality of the NL-53 at a more cost-efficient level, while maintaining compliance with international standards for professional noise assessments.

Typical application areas:

Environmental noise monitoring where a Class 2 sound level meter is accepted by local or national regulations
Occupational noise assessments in workplaces to support compliance with hearing conservation and safety standards
Industrial acoustics evaluations where higher-frequency content above 8 kHz is not critical to the analysis

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Sound Level Meters from Rion

Explore the possibilities of noise measurement

This video demonstrates the three different sound level meters from Rion.

You'll see:

NL-43, a Class 2 sound level meter
NL-53, a Class 1 sound level meter
NL-63, a Class 1 sound level meter,
with low-frequency sound measurement function

Measurement range and core functions

The Norsonic NL-43 delivers the same measurement functions as the NL-53, with the key technical difference in its frequency range. The NL-43 covers 20 Hz to 8 kHz, while the NL-53 extends from 10 Hz to 20 kHz, up to the upper limit of typical human hearing.

Optimised for common noise applications

For many environmental and occupational noise applications, frequencies up to 8 kHz capture the dominant components that contribute to annoyance, disturbance, and regulatory non-compliance. In such cases, selecting the NL-43 provides a technically sound and economical choice when your measurement tasks do not require analysis above 8 kHz.

Standards-compliant performance

Despite its narrower frequency range, the NL-43 is engineered to the same quality level as our higher-specification models. It fully complies with IEC 61672-1:2013 and ANSI/ASA S1.4, making it suitable for regulation-driven noise monitoring and documentation.

Integration in professional workflows

The NL-43 integrates effectively into professional measurement workflows, supporting precise, standards-compliant data collection for noise compliance documentation and long-term monitoring programs.

Features

Standards

Options

Downloads

Features

Touch panel screen
USB-C connector
LAN terminal
Web browser function

Standards

IEC 61672-1:2013
ANSI ASA S1.4

Options

NX-43EX Extended function program

The NX-43EX module unlocks advanced functionality, including instantaneous value logging, trigger-based measurements, comparator operation, LAN connectivity, and noise event tagging for traceable documentation. The NX-43EX must be installed before integrating the NX-43WR, NX-43RT, and NX-43FT modules into your measurement system.

NX-43RT Octave, 1/3 octave band analysis program

NX-43RT is real-time octave and 1/3 octave band analysis program.


1/3 Octave band analysis	NC curve evaluation	Graph overlay

NX-43FT FFT analysis program

NX-43FT is FFT(Fast Fourier Transform) analysis program.


FFT analysis display	Top 20 peak list

NX-43WR Waveform recording program

Record detailed noise waveforms for reliable playback and post-analysis.
Use event-triggered recording to capture only noise events that exceed a preset threshold, optimizing storage and review time.
Post-process recorded noise data with the AS-70 waveform analysis software, converting time-domain signals into:
FFT spectra for frequency-domain analysis
Octave and 1/3-octave band analysis with user-defined settings and preferences.