Hemi Anechoic Chamber Number:
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1 1 of 6 Hemi Anechoic Chamber Architecture:
2 2 of 6 * Concrete floor and walls * Control room dimensions = 20 x 15 X 10 Feet.
3 3 of 6 Inner View / Features (not limited to below listing): * only a representative photo - The lighting to be incandescent flood lamps / LED to provide min. 500 lux of light at 3 above the floor. - Video Surveillance System incorporating sufficient cameras (night vision) covering all areas of chamber and control room, with video recording feature; plus required PC with software. - 8 Roof Instrumentation hangers for mics and other accessories. - Mortised Handles for doors. - Perforated covered corner and base fill m depth of treatment, perforated metal wedges with positive fiber containment and a white painted finish. - Removable side walls for testing equipments placed to chamber walls. This side wall should be designed to have absorption co-efficiency close to zero. - All materials used for acoustic treatment are fire proof certified as per ASTM standards. - Provisions with-in the chamber to be made to incorporate Fire Protection System (sensors, sprinklers & alarms). - STC 52 grade double door to be provided at all locations. 2.2m (W) x 2.5m (H) dimensions in min. - Floor should be completely isolated from the ground vibration and the inside room should have frequency less than or equal to 3 hertz. - Duplex receptacles to be provided to connect the equipment under test with-in the chamber. - HVAC system with suitable ventilation silencers and plenums to be incorporated to meet ambient noise with-in the chamber. - Isolated floor to avoid ambient noises via this medium. - Port Plugs with silencers to route cables in-out of chamber.
4 4 of 6 Measurement Equipments, Software, Mics & Accessories with following features Data Acq. System, Mics, PC, Switch, Calibration Kit & Software set-up covering the below 01 Set list. Optimized and not limited to the same. Analyzer (Multi channels data acquisition system hardware & different software) for FFT & CPB Analysis, Real Time data recording and post processing, Sound power calculation, Sound intensity calculation, 2D and 3D view of the time and frequency graph Multi- channel Input Module and expandable in future with higher sampling rate and flexible power option Dual Module and IDAe/IDA Systems any size Front-end Driver, Node-locked Measurement System Switch, LAN-switch with PoE and PTPv2 support for an interface to PC. 1/2 inch Free-field Microphone incl. Preamplifier with TEDS 12 no s. Multifunction Acoustic Calibrator as per IEC 60942, Class 1 with wide frequency range and calibration levels. Inverse A- Weighting. Recurrent pulses for time-weighting and crest factor checks. Or Pistonphone as per IEC 60942, Class 1 Viewer software, unlimited channel Node-locked License (Acoustic Data measurement, FFT and CPB analysis, Time capture & recording, sound power, sound intensity) Sound Intensity Probe Kit as per IEC 1043 Class 1 Rotating Microphone Boom Liberating full functionality of Base software, Node-locked License ( Export and import all types of files for viewing and editing, customized test report generator with Graphical representations) Liberating full functionality of Basic Processing software, Node-locked License having following processing feature Offline analysis of recorded time data General acoustic analysis Rotating machinery analysis Stationary and non-stationary FFT, CPB (1/n-octave) and Overall (broadband) analysis Sound quality analysis Simultaneous parallel analysis with different filter settings, FFT bandwidths, and 1/n-octave setups Visualization, editing and audio playback of time data in preparation for analysis Display of frequency, RPM and order content of time signals during audio playback Frequency weightings. Batch processing of multiple sets of time recordings Simple and efficient reporting of results with user-definable layouts and user-selectable metadata) Liberating full functionality of Standardized CPB Option, Node-locked License Front panel, detachable, multi channels, circular (F) connectors (Interchangeable front panels to BNC,LEMO or Multi-Pin connectors) Front panel, Sound intensity, detachable, multi channels, circular (F) & sub-d 9-pins (F) - BNC out (Interchangeable front panels to BNC,LEMO or Multi-Pin connectors) 12 No s Tripods for microphones arrangement around the testing device (Tripods surface should not reflect the noise produced by Testing device) Height adjustable to 4m and have 3 degrees of freedom. PC with multi-user license for remote monitor and control.
5 5 of 6 General specifications 1.Chamber Design as per Precision Grade as per ISO 3744 / Background Noise 18dBA with HVAC OFF / 20dBA with HVAC ON. 3.Lower Cut-Off Frequency 100 Hz 4.Measurement Frequency Range Hz 5.Chamber Internal Dimension 10 m X 10 m X 5 m 6.Internal Temperature 23 +/- 5K 7.Humidity 50% +/- 20% 8.Microphones As per IEC ,Class 1 9.Measurement 1/1 and 1/3 octave band A- Weighting and C- Weighting 10. Calibrator IEC 60942, Class 1 * Certifying noise emitted by medical equipment * verifying declared Noise 11.Sound Power level used for * Comparing Noise emitted coming from different machines( In type and size ) * Predicted Noise level * Characterizing Noise source
6 6 of 6 1 Steady-band 2 Unsteady 3 Fluctuating 4 Broadband 5 Narrow-band 6 Isolated burst 7 Discrete 8 Discrete if stationary Noise Measurement - Types 1 Hemisphere 2 Half Hemisphere 3 Quarter Hemisphere 4 Right parallelepiped 5 Cylinder 6 Half cylinder 7 Quarter Cylinder 8 Moving microphones for spherical method 9 Meridional path for a moving microphone 1 Table top operated 2 Floor standing 3 Wall mounted 4 Rack mounted 5 Hand Held Measurement surfaces Types of Mounting arrangements Applicable test standards 1 ISO 3744 Determination of sound power level and sound energy level using sound pressure 2 ISO 3745 Determination of sound power level and sound energy level using sound pressure 3 IEC / IEC and all applicable series for Medical Equipments 4 ANSI S12.55 Determination of sound power level and sound energy level using sound pressure 5 ANSI S12.54 Determination of sound power level and sound energy level using sound pressure
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