NetdB Pro-515

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NetdB Pro-515

Acoustic Absorption

Kundt Method for getting characteristics of Porous Materials

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Overview

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Main Functions

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Applications

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Specifications

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OVERVIEW

NetdB-PRO-515: Kundt Method for porous materials!
A complete system for getting the absorption characteristics of porous materials, using the Kundt method complying with ISO-10534 and ASTME E-1050 standards.

The PRO-515 system is composed of:

bullet2 Kundt tubes of different sizes both holding a wideband acoustic plane wave source
bullet¼'' microphones and adjustable samples holder
bulletInternal (Symphonie) or external noise generator
bullet2-way wideband power amplifier/booster  

Together with a Windows-based dedicated software, PRO-515 allows easy and reliable measurement of the acoustic absorption "a" coefficient of porous materials

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Main functions

Standard compliant and Expandable

bullet2 Kundt tubes of different diameter sizes (28mm and 100mm respectively) according to ISO1053 and ASTM E-1050
bulletSamples length up to more than 40 cm
bulletImprove precision by using 2 independent tubes and heavy Alu-based tubes construction
bulletKundt tubes pair upgradeable for TL measurement
bulletAlternative methodology available for poro-acoustic materials characteristics based on Impulse response technique  

Easy to operate and flexible

bulletUser friendly software interface leading up to completion of the measurement
bulletTypical application for Laboratory use
bulletAlso portable and battery operable
bulletEasy calibration in amplitude and phase for microphone pairs  

Options

bulletUpgrade to PRO-516 for TL measurements from TF method
bulletUpgrade to PRO-517 for increased accuracy in parameters determination using on Impulse Response for: Alpha and Zc complex (energy based method)

 

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Applications

Applicable to Porous, Multi-layers, Sandwich materials in: Automotive, Aeronautics, Railway, Ship, Construction Machines, Building construction

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SPECIFICATIONS

Signal input

bulletInput impedance: 1 Megohms
bulletInput connection: DC o AC (da 0,3 o 10 Hz +/ - 10 %); LEMO 7 pin
bulletSignal conditioning: Microphone Preamplifier (28V-10mA), Polarization Voltage (0-200 V), IEPE* (4.3 mA), Direct Input
bulletTacho input: Auxiliary Input
bulletMax voltage input: 20 V p-p, Overload protection
bulletChannels: < 0.1° with same gain on both channes, < 0.5° if different gain
bulletPhase Filtering: HiPass filter (0.3/10 Hz)

A/D Convertor

bulletResolution: 18 bits sigma/delta.
bulletSampling: 51.2 kHz max.
bulletAntialiasing: Butterworth, 120dB/octave
bulletOffset: Automatic
bulletSignal/Noise ratio: > 90dB
bulletAmplifiers: up to 65 dB in 1 dB step600MHz

Analog Output

bulletType: 1-2 channels output syncronized with acquisition
bulletSampling: From 100 Hz to 51.2 kHz
bulletConnection: LEMO 4 pin
bulletConverters: 18 bits
bulletMax Voltage output: 5 V p-p

Dimensions

bulletDimensions: 85 x 35 x 220 mm
bulletWeight: 500 gr

Digital I/O

bulletConnections: 2 inputs and 2 ouputs
bulletProcessors: TMS320C31 + TMS320C203
bulletPerformance: 100 MFLOPS
bulletPrecision: 32 Bits
bulletSRAM: 128K x 32 bits
bulletRAM: 16Kb double access
bulletConnector: Mini Dyn (PS/2 )

Power supply

bulletPower supply type: PC powered PCMCIA card

Microphone Cartridge

bulletType: ¼'' Pressure
bulletSensitivity: 4mV/Pa
bulletFreq. Range (±1dB): 10Hz - 40kHz
bulletPolarisation voltage: 200V
bulletCapacitance: 7pF
bulletCalibration certificate : included

Plane Wave Loudspeakers

bulletRated Power: 50W
bulletCoil Impedance: 4 ohm
bulletFreq. Range (±3dB): 100Hz - 15kHz
bulletResonant Freq.: 70Hz
bulletSource Diameter: 130mm

Noise Generator

bulletNoise spectrum: White - Pink
bulletCrest Factor: >3.3
bulletBandwidth: 10Hz - 40kHz
bulletOutput Level: 0dB (re 1Vrms); -10dB; -20dB
bulletOutput Impedance: 50 ohm

Power Booster

bulletRated Power (2x4 ohm load): 2x22W
bulletFreq. Range: 1Hz - 150kHz
bulletTotal Harmonic Distortion: <0.1%
bulletHi-pass Filter: 31.6Hz - 100Hz
bulletLo-pass Filter: 5kHz - 20kHz

Mechanical Elements

bulletFrequency Response:
(28mm Tube): 450Hz - 7100Hz
(100mm Tube): 50Hz - 1800Hz
bulletNo-Sample Absorption (Tube 28 / 100 mm): <2% / <3%
bulletSource - Sample Distance (Tube 28 / 100 mm): 165 / 550 mm
bulletSample Length (Tube 28 / 100 mm): up to 250mm
bulletDevice Weight (28 / 100): approx. 6 / 17 kg
bulletHeight x Depth (both devices): 260 x 250 mm
bulletLength (no sample) (28 / 100): 700 / 1165 mm

Software

bulletPlatform: MS Windows '98 / 2000 / XP
bulletGraphical User Interface: Simple 2 level menu
bulletKundt Device Calibration: Message driven
bulletFreq. Sub-Ranges: User selectable
bulletFrequency Sub-Ranges Linking: Available
bulletAcquisition parameters: User selectable
bulletAbsorption coefficient "∧":Automatically computed
bulletGraphical Data Rendering: FFT or 1/3 octave
bulletMultiple Data Superimposing: Available
bulletDatabase Type: Native, user selectable
bulletData Export Format: text file
bulletReport Printout: Standard available

Microphone Preamplifier

bulletSize: ¼''
bulletFreq. Range: 2Hz - 200kHz
bulletNoise (Lin): <6µVRMS
bulletBody Length: 43mm
bulletCable length: 2m
bulletConnector: Lemo 7 pin male

* IEPE: Integrated PiezoElectric Electronic

Ordering Information:

SSP3002000: Symphonie 2 channel inputs Lemo 7 - 2 channel outputs - PCCARD Interface
G-40BP: ¼'' Pressure Microphone
G-26AC: ¼'' Microphone Preamplifier with Integral Cable 2m
M-V11: Power Booster with HP - LP Filters
M-G10: Noise Generator
M-AR42OK: 12V DC System Power Supply / Four Module Holder
ALIM-AT3: 220V AC/12V DC 3A Main Adapter
SS000/1-SET: High Quality BNC Interconnection Cable Set (3x1m)
dBAlphatest: Software Package for alfa coefficient (Win98 / 2000 / XP)
SCS9020B: 2 Kundt Tubes sizes f28x165mm and f100x600mm), 2 Adjustable Sample Holders  sizes f28x250mm and f100x90mm

 

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