SW Series Impedance Tube Solutions

Transcription

1 SW Series Impedance Tube Solutions BSWA SW series Impedance Tubes can accurately measure sound absorption coefficients and impedance according to ISO or ASTM standards. They also support the sound transmission loss measurements based on the Transfer Function Method using four microphones. Impedance Tubes The SW series Impedance Tubes are specially designed to not only work with precut samples, but also for direct use in the field. BSWA offers complete set of Impedance Tube systems that include: Tubes with built-in loudspeakers Sample holders for absorption measurements Extension tubes for transmission loss measurements Microphones/Cables Microphone Calibrator DAQ hardware/amplifiers The small size and durable aluminum construction make it easy to be transported and used for estimating the properties of walls, ceilings, installed building materials, road surfaces, different ground surfaces, interiors of vehicles, etc. The inner diameter of each tube corresponds to the effective measurement frequency range. A larger diameter tube is suitable for measurements in the lower frequencies while a small diameter tube can measure in the higher frequencies. The diameter of the tube also indicates the diameter of the samples needed for measurements when placed inside the sample holders. version 2530 Page

2 Measurement Capabilities and Standards The SW series impedance tubes all use the transfer function method for absorption and transmission loss testing. The systems are available in two different designs conforming to either ISO or ASTM test standards. Impedance tubes designed according to ASTM specifications can measure acoustic absorption according to ASTM E050 and transmission loss according to ASTM E26. Impedance tubes designed according to ISO specifications can measure acoustic absorption according to ISO As an ISO standard for transmission loss testing does not exist, a transfer function using 4 microphones method is used. The main difference between systems designed in accordance to ISO or ASTM standards is the location of the microphone holders. Furthermore, an additional sample holder is also provided for systems conforming to the ASTM E26 transmission loss standard. The following tables display various models available for systems conforming to ISO and ASTM test standards: Available Impedance Tube Systems Conforming to the ISO standard and transfer function using 4 microhones method Model Number SW470 SW230 SW420 SW477 SW433 SW422 Tube Diameter 30mm 60mm 00mm 30mm 60mm 00mm Measurement Frequency (Hz) *Theoretical Measurement Frequency (Hz) Number of Microphones Measurement Capability Absorption Coefficient Yes Yes Yes Yes Yes Yes Reflection Coefficient Yes Yes Yes Yes Yes Yes Impedance (complex) Yes Yes Yes Yes Yes Yes Admittance (complex) Yes Yes Yes Yes Yes Yes Reflection Coefficient (Complex) Yes Yes Yes Yes Yes Yes /n Octave Absorption Coefficient Yes Yes Yes Yes Yes Yes Transfer Function Yes Yes Yes Yes Yes Yes Transmission Loss Yes Yes Yes G, G2, G3, G4 Transfer Function Yes Yes Yes /n Octave Transmission Loss Yes Yes Yes Page 2

3 Available Impedance Tube Systems Conforming to ASTM standards Model Number SW470 SW420 SW477 SW422 Tube Diameter 30mm 00mm 30mm 00mm Measurement Frequency (Hz) *Theoretical Measurement Frequency (Hz) Number of Microphones Measurement Capability Absorption Coefficient Yes Yes Yes Yes Reflection Coefficient Yes Yes Yes Yes Impedance (complex) Yes Yes Yes Yes Admittance (complex) Yes Yes Yes Yes Reflection Coefficient (Complex) Yes Yes Yes Yes /n Octave Absorption Coefficient Yes Yes Yes Yes Transmission Loss - - Yes Yes /n Octave Transmission Loss - - Yes Yes Transmission Coefficient - - Yes Yes Propagation Wave Number - - Yes Yes Data Acquisition Hardware and Amplifiers The impedance tube systems are designed to be used with a 2-channel MC3522 or a 4-channel MC3242 data acquisition hardware cards. The 2-channel MC3522 is ideal for absorption measurement systems where only two microphones are necessary. The MC3522 has a built in amplifier used to power the loudspeakers of the test tubes. The 4-channel MC3242 is required for transmission loss measurements where 4 microphones are necessary. Unlike the MC3522, the MC3242 does not contain a built-in amplifier. As a result, a dedicated PA50 power amplifier is used to drive the loud speaker in the impedance tube. The MC3242 is used in a complete system for both absorption and transmission loss testing. Microphones and Microphone Calibrator BSWA /4 MPA46 microphones, which have excellent phase matches, are ideal for impedance applications. The microphones are directly connected to optional 2-channel MC3522 or 4-channel MC3242 data acquisition hardware using BNC-to-SMB cables. BSWA CA5 microphone calibrator is used to periodically calibrate the microphone signal chain of the system. Page 3

4 VA-LAB Software BSWA VA-Lab software includes the Impedance Tube Module (VALab IMP) which supports sound absorption and sound transmission measurement for BSWA SW series impedance tubes. The software works with BSWA MC3022, MC3522, MC3242 and MC3642 hardware for data acquisition and analysis. Its ease of use allows the user to quickly choose between absorption and a transmission loss measurement. All necessary parameters such as sample thickness and environmental conditions can be entered within a single window. Results from tubes of differnet diameter can be combined to provide seamless results in a single frequency range. Reports can be quickly generated and exported into Excel using VA-LAB's report generator. Page 4

5 Ease of Use The simple design of BSWA SW series impedance tubes keeps the set up time to a minimum, ensuring that more time is spent on actual measurements. Example of a System set up for Absorption Measurements Example of a System set up for Absorption Measurements Example of a System set up for Transmission Loss Meaurements (ASTM E26) Page 5

6 Complete Systems for Absorption Measurements The following tables provide information on complete impedance tube systems for acoustic absorption measurements. Tubes of different diamter can be combined to create a system for desired test frequency range. SW 470 For accurate measurement of sound absorption coefficients, 30mm inner diameter. Includes: - 30mm diameter tube with loudspeaker - 30mm diameter sample holder 2 MC 3252 USB Soundcard with 2 ICP input channels and output channel; with built-in power amplifier of 20W 3 MPA 46 /4" microphone with ICP Preamp 2 4 CBS005 BNC to SMB cables, 5m, to connect MPA46 to MC CAA002 Banana cable to connect MC3522 to the speaker of the impedance tube (2m) 6 CA5 000Hz, 4dB calibrator, Type 2, with adaptor for /2'' and /4'' microphones 7 VA-Lab2 BASIC Base software for measurement of noise and vibration, used for 2 channels 8 VA-Lab2 IMP-AT Software for measurement of material impedance values (2 mics are needed), for measurement of SW 230 For accurate measurement of sound absorption coefficients, 60mm inner diameter. Includes: - 60mm diameter tube with loudspeaker - 60mm diameter sample holder 2 MC 3252 USB Soundcard with 2 ICP input channels and output channel; with built-in power amplifier of 20W 3 MPA 46 /4" microphone with ICP Preamp 2 4 CBS005 BNC to SMB cables, 5m, to connect MPA46 to MC CAA002 Banana cable to connect MC3522 to the speaker of the impedance tube (2m) 6 CA5 000Hz, 4dB calibrator, Type 2, with adaptor for /2'' and /4'' microphones 7 VA-Lab2 BASIC Base software for measurement of noise and vibration, used for 2 channels 8 VA-Lab2 IMP-AT Software for measurement of material impedance values (2 mics are needed), for measurement of SW 420 For accurate measurement of sound absorption coefficients, 00mm inner diameter. Includes: - 00mm diameter tube with loudspeaker - 00mm diameter sample holder 2 MC 3252 USB Soundcard with 2 ICP input channels and output channel; with built-in power amplifier of 20W 3 MPA 46 /4" microphone with ICP Preamp 2 4 CBS005 BNC to SMB cables, 5m, to connect MPA46 to MC CAA002 Banana cable to connect MC3522 to the speaker of the impedance tube (2m) 6 CA5 000Hz, 4dB calibrator, Type 2, with adaptor for /2'' and /4'' microphones 7 VA-Lab2 BASIC Base software for measurement of noise and vibration, used for 2 channels 8 VA-Lab2 IMP-AT Software for measurement of material impedance values (2 mics are needed), for measurement of Page 6

7 Complete Systems for Absorption and Transmission Loss Measurements The following tables provide information on complete impedance tube systems for acoustic absorption and transmission loss measurements. Tubes of different diamter can be combined to create a system for desired test frequency range. SW 477 For accurate measurement of sound absorption coefficients and transmission loss, 30mm inner diameter. Includes: - 30mm diameter tube with loudspeaker - 30mm diameter sample holder - 30mm diameter extension tube 2 PA50 Power Amplifier of 50W 3 MC 3242 DAQ card with 4 ICP input channels and 2 signal output channels, USB power supply connected with laptop 4 MPA 46 /4" microphone with ICP Preamp 4 5 CBB005 BNC to BNC cables, 5m, to connect PA50 to MC CBS005 BNC to SMB cables, 5m, to connect MPA46 to MC CAA002 Banana cable to connect MC3522 to the speaker of the impedance tube (2m) 8 CA5 000Hz, 4dB calibrator, Type 2, with adaptor for /2'' and /4'' microphones 9 VA-Lab4 BASIC Base software for measurement of noise and vibration, used for 4 channels 0 VA-Lab4 IMP-AT Software for measurement of material impedance values (4 mics are needed), for measurement of SW 433 For accurate measurement of sound absorption coefficients and transmission loss, 60mm inner diameter. Includes: - 60mm diameter tube with loudspeaker - 60mm diameter sample holder - 60mm diameter extension tube 2 PA50 Power Amplifier of 50W 3 MC 3242 DAQ card with 4 ICP input channels and 2 signal output channels, USB power supply connected with laptop 4 MPA 46 /4" microphone with ICP Preamp 4 5 CBB005 BNC to BNC cables, 5m, to connect PA50 to MC CBS005 BNC to SMB cables, 5m, to connect MPA46 to MC CAA002 Banana cable to connect MC3522 to the speaker of the impedance tube (2m) 8 CA5 000Hz, 4dB calibrator, Type 2, with adaptor for /2'' and /4'' microphones 9 VA-Lab4 BASIC Base software for measurement of noise and vibration, used for 4 channels 0 VA-Lab4 IMP-AT Software for measurement of material impedance values (4 mics are needed), for measurement of SW 422 For accurate measurement of sound absorption coefficients and transmission loss, 00mm inner diameter. Includes: - 00mm diameter tube with loudspeaker - 00mm diameter sample holder - 00mm diameter extension tube 2 PA50 Power Amplifier of 50W 3 MC 3242 DAQ card with 4 ICP input channels and 2 signal output channels, USB power supply connected with laptop 4 MPA 46 /4" microphone with ICP Preamp 4 5 CBB005 BNC to BNC cables, 5m, to connect PA50 to MC CBS005 BNC to SMB cables, 5m, to connect MPA46 to MC CAA002 Banana cable to connect MC3522 to the speaker of the impedance tube (2m) 8 CA5 000Hz, 4dB calibrator, Type 2, with adaptor for /2'' and /4'' microphones 9 VA-Lab4 BASIC Base software for measurement of noise and vibration, used for 4 channels 0 VA-Lab4 IMP-AT Software for measurement of material impedance values (4 mics are needed), for measurement of Page 7

8 Technical Specifications PA50 Amplifier Input Channel, BNC Connector Output Channel, Banana Connectors (2) Power 0V Power Supply Rated output power 50W (8Ω) Max Instantaneous Power 35W (8Ω) THD (Total Harmonic 0.% (20Hz 20kHz) Distortion) Signal to Noise Ratio (SNR) 90dB Temperature -0 C to 40 C Humidity 0 to 98% RH Dimensions 0.5 (270mm) x 8.5 (220mm) x 4.3 (0mm) Weight 7 lbs. (3.5 kg) Includes Case, Power Supply Cable, Manual, Test Report MC3522 DAQ with built-in amplifier MC3242 DAQ Input 2 Channels, BNC Connector 4 Channels, BNC Connector Input Channel Type ICP (4 ma) ICP (4 ma) A/D Converter 6 Bits 24 Bits Max. Sampling Frequency 44. khz 50 khz Cross Talk: >80dB >80dB Frequency Response (Ref: 20Hz 20kHz 20Hz 20kHz 250 Hz, + 0.5dB/-.0 db) Total Harmonic Distortion <0.0% <0.0% Measurement Range (with 35-8 dba dba MPA46 microphone) Max. Input Voltage Vrms 5 Vrms Output Channel, Banana Connectors (2) or 2 Channels, BNC Connector BNC Connector Output Frequency Range 20Hz 20kHz 20Hz 20kHz Max Output Voltage Vrms Vrms Max Output Power 20W - Temperature -0 C to 40 C -0 C to 40 C Humidity 0 to 98% RH 0 to 98% RH Dimensions (285mm) x 8 (200mm) x 4 (00mm) 0 (260mm) x 6 (60mm) x 5.5 (45mm) Weight 4.8 lbs (2.2 KG) 3.3 lbs. (.5 Kg) Includes Case, Power Supply Cable, USB Cable, Manual, Test Report Case, Power Supply Cable, USB Cable, Manual, Test Report Page 8

9 Technical Specifications MPA 46 Microphone CA5 Calibrator Standard Sound Pressure Level Frequency Microphone Diameter Harmonic Distortion Equivalent Free-field Level Equivalent Random Incidence Level Reference Conditions Environmental Conditions Power Supply Dimension (mm) Weight Includes IEC60942:2003 Class 2, ANSI S , GB/T dB/4.0 db ±0.3 db 000Hz ±0.5% According to IEC6094-4: /2 & /4 <2% Stabilization Time: <0 s -0.2 db for /2 Microphones +0.0 db for /2, /4 Ambient Temperature: 25 C (77 F) / Ambient Pressure: 0.3 kpa / Humidity: 55% RH / Effective Load Volume: 250 mm3 Temperature: -0 C-50 C (4 F -22 F) Pressure: 65 kpa to 08 kpa Humidity: 0 to 90%RH (noncondensing) Batteries:.5 V LR6 (AA battery) 2 Lifetime: Typically 40 hours with alkaline batteries at 25 C (77 F) g, including batteries Calibration Certificate Diameter Standards (IEC6672) Microphone Optimized Preamplifier Frequency Response (Hz) Open-circuit Sensitivity (mv/pa) (±2dB) Output Impedance (Ω) Dynamic Range Inherent Noise (dba) Operating Temperature ( C) Operating Humidity (RH) Temperature Coefficient (db/ C) Humidity Coefficient (db/%rh) Pressure Coefficient (250 Hz) (db/kpa) Length (mm) Input Connector Includes ¼ Class I Integrated Free Field Integrated 20Hz 20kHz 50 < dba < 29 dba -0 ~ 50 0 to 95% RH 5 ~ 35 C: < ±0.3 db; 0 ~ 40 C: < ±.5 db; -0 ~ 50 C: < ±3.0 db; with 000Hz, at reference 20% ~ 90% RH: < ±0.8 db with 000Hz, at reference temperature 23 C, Humidity 50% RH SMB Calibration Certificate, Case BSWA is distributed in the U.S.A. by: Scantek, Inc. Page 9