Measurements of Sound Power

The Nor850 measurement system is the state-of-the-art acoustical analyser from Norsonic. Using the experiences and accumulated knowhow from the previous generations of analysers such as Nor811, Nor823, Nor830 and Nor840, Norsonic is offering a multi-channel system with focus on user friendliness, high efficiency and accurate reporting. The system has been designed for field testing as well as demanding accredited lab measurements.

The software Nor850 Suite is connecting a variable number of individual measuring units to create the optimal system that suits the desired measurement task. Dedicated user-friendly apps offer the following application packages:

• General Analyzer;
• Building Acoustic;
• Room Acoustics;
• Sound Power;
• Appliance Noise.

Nor850-MF1

The Nor850-MF1 rack is delivered with a selectable number of measurement channels, and may be upgraded with additional channels as the needs grow. One rack can be fitted with up to ten channels. Multiple racks may be used in the same system alternatively in a mix with Nor140, Nor145 or Nor150 Sound Level Meters as additional frontends. Optionally, selected channels may be fitted with signal generator outputs.

General Analyser Mode

The General Mode allows you to make multispecter measurements in all channels simultaneously with various settings for frequency range and level profiles. The profiles have user-defined period lengths from a few msec to several minutes. The results are presented in user-defined setups with both level vs. frequency and level vs. time views as well as tables. Special views for 3D or Spectrogram are also available.

Quality control measurements are easily made using the two reference spectra possibilities. Each reference spectre may be used as a lower or upper boundary with a Go/NoGo output to the operator.

The Nor850 Suite offers an environmental software extension that enables the user to make audio recordings in selected channels and to insert event markers along the timeline during the measurement sequence.

Available features for all modes
In the heart of the Nor850 Suite there is a sensor database containing all possible information about each users complete list of measurement transducers (microphones, preamplifiers, accelerometers, etc.) including serial numbers, product name, producer, calibration history, verification laboratories, the date of next verification, correction data, and more. The data base may also include similar data for calibrators and reference sound sources.

Logging of DC-voltage levels in parallel with the acoustic measurements is available, as well as direct read-in of temperature, humidity and pressure from external sensors.

Individual units for each measuring channel offer a very high degree of operating flexibility. It allows the user to operate a multichannel system one day – or many individual measuring units another day!

The multichannel system Nor850 is expanding as the needs grow. Start with the new Nor150 SLM, or two units of the Nor140 or 145 SLM’s, and increase step-by-step by adding additional SLM units – or mix with Nor850-MF1 Racks containing 1-10 measuring channels.

By connecting a number of individual measuring units through various communication channels – including both LAN and USB – the user may create the optimal multichannel system for any task. Wireless communication through Bluetooth or WLAN is also available.

Each individual measuring unit may be homologated by independent verification laboratories.

Building Acoustics Mode
The basic Building Acoustics application package includes all required features for performing sound insulation tests in the field. Both the traditional ISO 140 Standards as well as the new ISO 16283 Standards are included, plus national varieties of these. The ASTM Standards E336, E90 as well as the E413 are also included.

In the extended Building Acoustics package, the more advanced laboratory test such as ISO 10140 as well as ASTM E1007, E492 and E989 are included together with absorption coefficient testing in accordance with ISO 354 and ASTM C423.

The signal generator offers white, pink or bandpass filtered noise even with user defined pre-excitation of the measurement chambers. The Nor850 Suite additionally offer features for automatic control of Rotating Microphone Booms, Tapping Machines as well as control of moving loudspeaker systems.

Calculation of sound insulation indices with predefined printed reports as well as parameter input in both metric and US formats. Enhanced features for multichannel calibration procedures are available using remote displays and acoustic loudspeaker feedback.

Old measurement project from previous Norsonic analysers may be imported and compared with new measurements using the multi-project feature. Measurement results are re-used in new projects by easy drag&drop functionality.

Room Acoustics Mode
The new room acoustics module 850/RA offers the complete evaluation according to EN ISO 3382-2 (ordinary rooms) and EN ISO 3382-3 (open-plan offices).

The reverberation time T for the evaluation according to EN ISO 3382-2 can be measured via the impulse or noise excitation, either first in the sound level meter or directly via the Nor850 software – with wireless control of the Nor145 sound level meter and power amplifier via WLAN.

In addition to the evaluation according to EN ISO 3382-2, the Module also enables the measurement of the room impulse response using the SweptSine excitation followed by calculation of the reverberation time and speech intelligibility, as well as the complete measurement routine and evaluation for open-plan offices according to ISO 3382- 3, including generating the test report with all single values (D2,S; Lp,A,S,4m; rD, rC, Lp,A,B).

Completely wireless – no more hassle with cables!

Sound Power Mode

• ISO 374x series.
• ISO 6395.
• Customized adaptions to other standards.
• Turn-key solutions.
• Scheduler for time saving testing and increased quality.
• Wlan communication or cable from measurement points to host.

The basic Sound Power application package includes all features required for making sound power test in accordance with the ISO 374x series.

The extended Sound Power application package contains required features for making more special tests such as dual-chamber testing of heat-pumps, dynamic testing of earth moving machinery in accordance to ISO6395 and similar. The entire test procedure can be controlled by a user programable Scheduler to minimize attended test personnel and increased quality. Norsonic offers turn key solutions and customized adaptions.

Wlan communication from the measurement points may be used in larger test setup in accordance with ISO 6395 to save cabling cost.

Appliance Noise Mode
Water below atmospheric pressure create vapor at lower temperature. Large pressure differences appear across small volumes of turbulent water. Here bubbles are created, and they collapse when they reach a region of higher pressure. This creates a disturbing amount of acoustic noise distributed through the tubes.

Standardized measurements are needed to compare the noise emitted from different products. The Appliance Noise application package includes the required features to perform a full laboratory test in accordance with the ISO 3822, Noise emission from appliances and equipment used in water supply installations.

The Norsonic Nor850 multi channel noise analyser is the perfect sound power measurement tool for use both in R&D and on production lines for any industry or test lab dealing with water appliances.

The optional Nor850/DC module measures water flow, water pressure, temperature, and other required parameters automatically to speed up the test.

• Highly configurable.
• Easy setup.
• Intuitive and efficient interface.
• Test Scheduler for automated processes.
• Customized report generator.
• Automatically read in of waterflow, temperature, pressure etc.
• For both experts and freshmen.
• ISO 3822 and EN12541 compatible.

For complete specification and demo of the product, contact us via our contact form.

• Oscillating microphone boom for spatial averaging in building acoustics or sound power measurements.
• Building acoustics measurements in accordance with ISO 10140 and ISO 16283.
• Reverberation time measurements in accordance with ISO 354.
• Sound Power measurements in accordance with ISO 3740 series.
• Directional response measurements of loudspeakers and microphones.
• Accurate positioning.
• Sweep of ±90º and ±180º.
• Direct control or remote control from a PC via LAN interface.
• User defined sweeps. Selectable sweep times.
• Supported by Nor850.
• LAN interface.
• Nor265 may be equipped with a turntable (optionally).

For complete specification and demo of the product, contact us via our contact form.