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Sound Level Meter

NL-43 Sound Level Meter

NL-43 Rion Class 2 sound level meter with 3.5-inch TFT-LCD touch panel, LAN connectivity, USB Type-C power and data, and IP54 protection. Measurement range 25–138 dB, 20 Hz to 8 kHz.

Overview

The NL-43 is a Class 2 sound level meter from Rion, distributed by Norsonic, designed around connectivity and ease of use. Its LAN terminal — activated by the optional NX-43EX extended function program — enables remote access from a web browser on any PC or smartphone, allowing users to monitor live measurements, operate the meter remotely (start/stop, settings, time adjustment), and download stor…

Key Features

  • IEC 61672-1: 2013 Class 2 compliant; also ANSI/ASA S1.4-2014/Part1 and JIS C 1509-1: 2017 Class 2
  • LAN connectivity for remote browser-based monitoring and operation (NX-43EX required)
  • USB Type-C: single cable for power supply, communication control, and data transfer
  • Backlit 3.5-inch TFT-LCD QVGA display with touch panel
  • Simultaneous measurement of up to four conditions with selectable frequency and time weightings
  • Auto store: Lp intervals from 10 ms to 1 s; Leq intervals up to 24 h; SD card storage
  • IP54 rated (excluding microphone); optional WS-15 windscreen adds IPX3 microphone protection
  • Approximately 12 hours battery life (alkaline AA at 23°C, ECO setting); up to 20 hours with 5000 mAh portable charger

Applications

  • Environmental noise surveys and unattended remote monitoring
  • Workplace noise screening and occupational noise awareness
  • Community noise complaint investigation
  • HVAC system noise verification and building services commissioning
  • Factory and machinery noise monitoring at site boundary lines
  • Construction site noise monitoring

Technical Specifications

  • Model: NL-43
  • Manufacturer: Rion Co., Ltd.
  • Applicable Standards: IEC 61672-1: 2013 Class 2, ANSI/ASA S1.4-2014/Part1 Class 2, JIS C 1509-1: 2017 Class 2, JIS C 1516: 2020 Class 2; CE, UKCA, China RoHS, KC mark
  • Microphone: UC-52 (sensitivity level: −33 dB)
  • Measurement Frequency Range: 20 Hz to 8 kHz
  • Measurement Level Range (A): 25 dB to 138 dB
  • Measurement Level Range (C): 33 dB to 138 dB
  • Measurement Level Range (Z): 38 dB to 138 dB
  • Peak Level Range (C-weighted): 55 dB to 141 dB
  • Peak Level Range (Z-weighted): 60 dB to 141 dB
  • Self-Generated Noise (A): 19 dB or less
  • Frequency Weighting: A, C, Z

Frequently Asked Questions

  • What is the difference between the NL-43 (Class 2) and NL-53 (Class 1)?
    The NL-43 complies with IEC 61672-1 Class 2 and the NL-53 with Class 1. Class 1 has tighter frequency response tolerances across the full measurement range, making it the required standard for most regulatory and legally defensible noise measurements. Class 2 has slightly wider tolerances and is accepted for many general-purpose measurements, screening surveys, and applications where the tighter Class 1 accuracy is not mandated. Both models share the same form factor, display, connectivity options, and optional programs.
  • Can the NL-43 perform remote monitoring over the internet?
    Yes, with the optional NX-43EX extended function program installed, the NL-43's LAN terminal enables remote access via web browser from any PC or smartphone. When connected to a mobile router, the meter can be monitored and operated from any WAN location, making it suitable for unattended environmental noise monitoring at remote sites.
  • What optional programs are available for the NL-43?
    The NL-43 supports four optional programs, all requiring the NX-43EX extended function program as a prerequisite: NX-43WR (waveform recording at 12/24/48 kHz, uncompressed WAVE format), NX-43RT (octave and 1/3 octave real-time analysis per IEC 61260-1, with NC/NR/CZ curve display), and NX-43FT (FFT analysis with 2.5 Hz resolution and 20 kHz range). These programs are supplied on SD cards and can be installed as needed.

Application Guide

The NL-43 Sound Level Meter belongs to the Norsonic Sound Level Meter range. See the Sound Level Meter application guide for system configuration, compatible accessories, and applicable measurement standards.

Related Norsonic Products

Why Norsonic?

  • Manufactured in Norway — decades of acoustic measurement heritage; all instruments designed and built in Norsonic AS, Lierskogen, Norway
  • IEC 61672 Class 1 — highest accuracy class for professional and regulatory acoustic measurement
  • International type approvals — PTB (Germany) and LNE (France); accepted by environmental authorities across the region
  • 3-year manufacturer warranty — covers parts and labour; Norsonic Asia authorized service center support throughout the region
  • Open data formats — .nox files work with NorReview and can be exported to CSV, Excel, and third-party analysis software

Calibration and Compliance

  • All Norsonic instruments require periodic IEC 61672-3 calibration — Norsonic Asia provides factory-authorized calibration services with full DANAK-traceable certificates
  • Calibration interval: 1 year for ISO 17025 accredited laboratories; 2 years for field instruments in non-accredited applications
  • Field calibration check: use an IEC 60942 Class 1 sound calibrator (94 dB or 114 dB) before and after each measurement session
  • Loaner instruments available during calibration to minimize project downtime — contact Norsonic Asia for loaner availability

Availability & Regional Support

Available from Norsonic Asia — the factory-authorized distributor for ASEAN, GCC, and South Asia. Instrument supply includes 3-year manufacturer warranty, factory-authorized calibration services, operator training, and after-sales technical support.

  • Typical lead time: 3–6 weeks from order confirmation (ex-factory Norway)
  • Countries served: Singapore, Malaysia, Thailand, Vietnam, Philippines, Indonesia, UAE, Saudi Arabia, Qatar, Kuwait, India, Bangladesh, Sri Lanka, and more
  • Technical support: English and Arabic; response within 1 business day

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