Small Device Noise Emission
Test System
The Small Device Noise Emission Test System from ViAcoustics is a turnkey solution for the measurement of noise emissions of small devices typically used in computers, consumer electronics, appliances and automobiles. The system includes all hardware and software necessary for the determinations of sound power levels (1/3 octave band and A-weighted), emission sound pressure levels (normalized 1/3 OB, A-weighted and high resolution FFT) and ISO 532B loudness. The system is designed to be operated by a technician for production level testing or to be used by an engineer in the product development process.
The Small Device Noise Emission Test System from ViAcoustics consists of
the following components:
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Reverberant Chamber |
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Double Wall, Free Field
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Hemi-Anechoic |
- Rotating Microphone System by Norsonic Space and time averaging of
sound pressure levels inside of the Small Device Noise Emission Test
System is achieved via automated control of a Norsonic N-265 Microphone
Boom Turntable by the Nelson Acoustical Engineering Trident software.
The boom motor is located on outside of the test enclosure to keep
ambient sound pressure levels inside of the enclosure at extremely low
levels (typically around 20 dBA, depending on low frequency noise levels
in the host facility). A custom boom assembly, designed for the type of
acoustic field and size of the test device, is joined to the NOR 265
motor chuck assembly and coupled through the enclosure shell using an
acoustically sealed bearing assembly. For more information on the NOR
265 boom, see:
http://www.scantekinc.com/datasheets/N265.pdf
- Data Acquisition Systems and Control Software by National Instruments The Small Device Noise Emission Test System utilizes a National Instruments PCI-4452 digital signal analyzer data acquisition card which is operated by a standard PC host. National Instruments LabView has been used to develop the Nelson Acoustical Engineering Trident software application which controls the data acquisition and performs the acoustical analysis. For more information on the National Instruments PCI-4452 see: http://sine.ni.com/apps/we/nioc.vp?cid=1844&lang=US
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Rotating Mic
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Boom Motor |
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PCI-4452 |
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- Microphones by GRAS Sound and Vibration The Small Device Noise
Emission Test System uses microphone and preamplifier assemblies from
GRAS Sound and Vibration, manufacturers of the high quality, low noise,
laboratory grade transducers for acoustic measurements. Free field or
random incident microphone assemblies are utilized, based on the type of
acoustic field chosen for the test enclosure. For more information on
GRAS microphones and preamps, see www.gras.us
- Trident Data Acquisition and Control Software by Nelson Acoustical
Engineering The heart of the Small Device Noise Emission Test Systems
is the Nelson Acoustical Engineering Trident software application.
Developed using National Instruments LabView and available as both an
executable application and in source code, the Trident software
application controls the rotation boom assembly, performs the data
acquisition, conducts the analysis and reports the test results. Data is
exported seamlessly into MS Excel spreadsheet templates that can be
customized for further data analysis, automated test reports and storing
of results in a database.
- Host PCs by Dell Computer The ViAcoustics' Small Device Noise
Emission Test System use host PCs manufactured by Dell computer to
insure compatibility with all hardware, and superior technical support
for your system anywhere in the world.
- System Integration, Training and Support by ViAcoustics Each Small Device Noise Emission Test System is custom engineered and assembled by ViAcoustics prior to shipment. Acoustic test field, microphone types and assembly design are selected and designed based on information you provide on the type of product to be tested and the goals of the measurement. Data acquisition hardware, software and drivers are installed and validated on the host PC prior to shipment. Onsite training of your engineering and technical staff is provided by an acoustical engineer with over 20 years of experience in acoustic measurements. Online technical support allows ViAcoustics to work with you over the internet to support your test system.
The ViAcoustics' Small Device Noise Emission Test System is the perfect solution for measurement of noise emissions from devices such as:
- Disk drives, CD Drives, DVD drives
- Small consumer electronic devices
- Small fans/heat sink assemblies for PC component cooling
- Small motors and actuators used in automotive applications
Supported Measurements and Analysis
The Nelson Acoustical Engineering Trident software application conducts
the following measurements and analysis:
- Sound Pressure Level Emissions 1/3 OB (100 Hz to 20 kHz), A-weighted and Linear sound pressure levels from each of the four (4) measurement channels. Also, high resolution FFT results with up to 25,000 lines for 1 Hz frequency resolution are generated simultaneously.
- Sound Power Level Emissions 1/3 OB (100 Hz to 20 kHz), A-weighted (dB or bels) and Linear sound power level determination.
- Normalized Sound Pressure Level 1/3 OB (100 Hz to 20 kHz), A-weighted and Linear normalized sound pressure levels are calculated from the sound power level data based on a distance specified by the end users (typically 0.5 meter or 1 meter)
- ISO 532B Loudness The normalized sound pressure level is used to calculate overall and specific loudness in accordance with ISO 532B.
Click here for information about:
Test System Hardware
Software and Test Result Displays
