Noise excitation for BA
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Product Data PD NoiseExcit Ed5Rev2 Eng 0510 Noise Excitation Equipment for Building Acoustics Measurements Loudspeaker Systems Nor275 and Nor276 Power Amplifier Nor280 Tapping Machine Nor277 Norsonic is a leading supplier of noise excitation equipment as well as sound measuring systems for building acoustics. With more than 40 years of experience and by carefully listening to our customer’s requirements we have developed a complete range of noise excitation equipment. Besides, fulfilling the technical requirements set in the ISO140 and ISO3382 standards, our products is featuring a unique combination of small dimensions, low weight but yet robust and easy to use. A field assessment often requires the equipment to be carried up several floors. It is therefore important that the equipment is as small and light weighted as possible. However, new building constructions often have a much better sound insulation than previous constructions. It is therefore important that the emitted sound power is as high as possible in order to get a good signal to noise ratio in the receiving room. These are contrary requirements not easy to achieve with standard commercial equipment. Norsonic has therefore designed extremely powerful and lightweighted loudspeakers and a power amplifier with equalization, ensuring that the power is distributed to the frequencies that are required The Tapping Machine Nor277 follows the same design philosophy; light weighted, small and robust, with a weight of only 10 kg including the battery option. It is the first tapping machine with a build in self calibration test for hammer fall speed and rotational speed.

PD NoiseExcit Ed5Rev2 Eng 0510 2 Dodecahedron Loudspeaker Nor276 A multitude of applications within the field of building acoustics requires the use of isotropic sound fields. The loudspeaker Nor276 has been designed to comply with these requirements and satisfies the ISO 140-3 Annex C (Laboratory measurements), ISO 140-4 Annex A (Field measurements) and the ISO 3382-2 Annex A (Reverberation Time measurements). The output power level is up to 120 dB re. 1pW for a pink noise signal. The speaker comes with a tripod ensuring correct placement so that unwanted reflections and structural...

PD NoiseExcit Ed5Rev2 Eng 0510 3 Typical sound power level vs. frequency of the Dodecahedron Loudspeaker Nor276 when used with the pink noise source and equalizer included in the Power Amplifier Nor280. Dodecahedron Loudspeaker Nor276 and Power Amplifier Nor276 in situ with a Sound Analyser Nor140 fitted with wireless Bluetooth module for data transmission between sender and receivers room.

PD NoiseExcit Ed5Rev2 Eng 0510 4 Maximum and minimum directivity indices in different directions according to the requirements in ISO 140-3 and ISO 140-4 compared to the tolerance limits. Maximum and minimum directivity indices in different directions according to the requirements in ISO 3382-1 compared to the tolerance limits. 100 Hz 315 Hz 1 kHz 3,15 kHz Sound power in different directions for Nor276. The measurement is done in a horizontal plane through the centre of the loudspeaker. The graph shows the respons for a sinusoidal signal at 100 Hz, 315 Hz, 1 kHz and 3,15 kHz.

PD NoiseExcit Ed5Rev2 Eng 0510 5 Hemi-dodecahedron Loudspeaker Nor275 A powerful sound source designed for building acoustics measurements per ISO-140/4 Annex A (Field measurements). The source provides uniform sound radiation. When used with the power amplifier Nor280, the high sound power level ensures accurate descriptors in measurement conditions that include high background levels, high sound insulation properties and large room volumes. Nor275 is designed for placement on the floor and uses the floor as a mirror for emitted sound. The loudspeaker is designed to operate at full power...

PD NoiseExcit Ed5Rev2 Eng 0510 6 Power Amplifier Nor280 Our aim is to take the latest technology available to help our customers complete their measurements faster but without loss of precision. With the Nor280 we have again met this objective. This power amplifier is the 4th generation of specially designed units for building acoustic measurements from Norsonic. It is less than half the size and weight, but twice as powerful as its predecessors; it replaces the Nor260 as the preferred amplifier to drive the Norsonic range of full and hemi dodecahedron instrumentation loudspeakers. Unique...

PD NoiseExcit Ed5Rev2 Eng 0510 7 Specifications Nor280 Power Amplifier Output: Short-circuit and over-temperature protected Output connector: Speakon NL4MP Output power: 500 WRMS into 4ohmƒ| 250 WRMS into 8ohm THD+N < 0.1% The built-in LP and HP filters ensure that the output power matches the Norsonic Nor275 and Nor276 series of dodecahedron loudspeakers Peak power: >1 kWPEAK into 4ohmƒ|ƒn Output current: Maximum 35 A Input: Balanced input to avoid ground loops and cross talk to signal cables Input connector: XLR Input sensitivity: 1.0 VRMS Input impedance: 10 kÙ//220 pF Dimensions: (D x W...

PD NoiseExcit Ed5Rev2 Eng 0510 P.O.Box 24, N-3421 Lierskogen, Norway Tel.: +47 3285 8900 Fax.: +47 3285 2208 info@norsonic.com www.norsonic.com Distributor: Tapping Machine Nor277 The tapping machine Nor277 is the third generation of tapping machines from Norsonic for performing standardised impact noise tests (foot fall noise). It incorporates all the experience from the former generations into a compact, light, yet a rugged unit with the construction based on an extruded aluminium chassis. The hammers are made of harden stainless steel, ensuring non deformation of the hammer shape even...