Nor278
reference sound source
The reference sound source Nor278 is designed to produce a stable and uniform sound power output with unique long-term stability. The high sound power output makes it ideal for sound power measurements in a noisy environment. The rugged, but yet portable and light weight construction is perfect for field us as well a laboratory use. Every effort is made in the design to ensure a uniform frequency response and optimum directional characteristic well inside the requirements in ISO 6926.
The Nor278 reference source is especially suitable for in-situ sound power level identification of machinery, based on ISO 3747 or other comparative or inverse methods. But the source can also be used for calibration or verification of measurement spaces like reverberant rooms as in ISO 3744, (hemi) anechoic rooms as in ISO 3741, and any other sound measurement.
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 (ANSI S12.5 – 2006) for reference sound sources in the extended frequency range 50 Hz – 20 kHz.
- Individual calibrated (accredited calibration optional)
- Long-term stability
- Weight 18 kg (50 Hz) / 24,5 kg (60 Hz)
- Rugged
Standards:
- ISO 6926:2016 Acoustics — Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
- ISO 3741:2010 Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for reverberation test rooms
- ISO 3744:2010 Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering methods for an essentially free field over a reflecting plane
- ISO 3743-1:2010 Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering methods for small movable sources in reverberant fields
Part 1: Comparison method for a hard-walled test room - ISO 3747:2010 Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering/survey methods for use in situ in a reverberant environment
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