Nor278

Reference sound source

Nor278 is a reference sound source for precise sound power measurements.

Its rugged, compact construction is designed for reliable use in both laboratory environments and demanding field conditions.

Engineered for a stable, uniform sound power output, the Nor278 offers exceptional long‑term level stability.

Supplied with an accredited calibration certificate.

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Overview

The Nor278 reference sound source is engineered to deliver a stable, uniform sound power output with exceptional long‑term consistency. Its high sound power level makes it well suited for precise sound power measurements, even in demanding and noisy environments. The robust yet lightweight, portable design supports reliable use both in the field and in the laboratory.

Acoustic Performance and Standards Compliance

The acoustic performance of the Nor278 is carefully optimized to ensure a uniform frequency response and directional characteristic well within the requirements of ISO 6926:2016. This makes the Nor278 suitable for applications where standards‑compliant, repeatable measurements are critical.

Individual Assembly, Testing, and Calibration

Each Nor278 is individually assembled and tested to secure consistent performance. To ensure measurement quality and traceability, every unit is calibrated by the Norsonic Calibration Laboratory (NCL) in accordance with ISO 6926:2016. The same accredited service is available for periodic recalibration to maintain long‑term reliability.

Features

Standards

Specifications

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Features

A weighted Sound power output: 94 dB re 1 pW (50 Hz line frequency).
Sound power 50 Hz – 20 kHz: 94 dB re 1 pW (50 Hz line frequency).
Fulfils ISO 6926:2016 (ANSI S12.5-2016) for reference sound sources in the extended frequency range 50 Hz – 20 kHz.
Delivered with accredited calibration certificate.
Long-term stability.

Standards

ISO 3741
ISO 3743-1
ISO 3747
ISO 6926
ISO 7779

Specifications

Device type:
Nor278: Reference sound source according to ISO 6926:2016 for extended frequency range 50 Hz – 20 kHz
Nor278/US: Reference sound source according to ISO 6926:2016 for standard frequency range 100 Hz – 10 kHz

Power Supply: 220-240 Volt/50 Hz / 110-120 Volt/60 Hz
Power consumption: <750 W (typical 650 watt) (50 Hz) / <900 W (typical 800 watt) (60 Hz)
Fuses: 10A – slow blow (220 V) / 20A – slow blow (110 V)
Sound power output each 1/3-octave frequency band: >75 dB re 1 pW (50 Hz) / >77 dB re 1 pW (60 Hz) in each 1/3-octave bands in the range 100 Hz to 10 kHz.
A-weighted sound power output: 94 dB (typically) (50 Hz) / 97 dB (60 Hz)

Temperature: -25° to 50°C. Above 35°C intermittent use only.
Humidity: Up to 90 %, non-condensing.

Weight: 18 kg (50 Hz) / 24.5 kg (60 Hz)
Height exclusive handle: 396 mm
Height inclusive handle: 464 mm
Diameter: 283 mm

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Product data

Nor278 Reference sound source

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