CAS901 Measurement Microphone Verification and Calibration System
CAS901 is a newly launched microphone verification and calibration system by Beijing BSWA Technology. It provides solutions for metrology units, production lines, military enterprises, and university research institutes to build microphone metrology and calibration systems, helping customers meet ISO 9000 certification requirements for microphone measurement accuracy.The CAS901 measurement system includes hardware and test software, supporting the electrostaticactuator method, free-field comparison method, and dynamic range limit testing. It measures important parameters such as microphone sensitivity, frequency response, phase, and maximum sound pressure level.
The system hardware meets the requirements of GB/T 20441.6-2017, JJG 175-2015, JJF 1738-2019,JJF 1653-2017, JJG 1172-2019 and other calibration and verification regulations.
VA-Audio test software runs on Windows and features multiple test modules. A single test can yieldmultiple parameter results. It supports importing correction values and automatically applies them for free-field frequency response. Test results can be saved and imported for intuitive comparison,greatly improving microphone testing efficiency.
Features
● Complies with GB/T 20441.6-2017, JJG 175-2015, JJF 1738-2019, JJF 1653-2017, JJG 1172-2019 standards
● High-precision measurement system supporting microphone sensitivity, frequency response, phase matching, maximum SPL, and more
● Suitable for 1”, 1/2”, 1/4” and other microphone specifications
● Comes with test software featuring various test/analysis modules for easy operation
● Robust database for historical measurement data, intuitive comparison and monitoring ofmicrophone data changes
● Helps enterprises build self-inspection systems for microphones, saving time and cost, and better meeting ISO9000 annual verification requirements
● Verification and certification of working standard microphones
● Periodic inspection and accuracy checking of microphones
● Phase matching and selection for microphone arrays
● Standard metrology for metrology institutes, certification bodies, and manufacturing enterprises (e.g., automotive manufacturers)
Hardware System
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Component
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Description
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|---|---|
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Sound Source
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CA918 free-field standard sound source, CA925 high sound pressure calibrator |
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Data Acquisition
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NI PXIe dual-channel input/output acquisition card, 204.8 kHz sampling rate, 24-bit |
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Power Amplifier
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BSWA PA700 low-distortion D-class amp, max 270W (4Ω/8Ω) |
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Electrostatic Actuator
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BSWA EA011/EA012 electrostatic actuators, for 1”, 1/2”, 1/4”microphones |
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Power Supply
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BSWA AS021 actuator power supply, output +800VDC |
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Others
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BSWA CS002 microphone test stand, effectively reduces environmental noise |
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Note: For detailed system configurations and product specifications, please refer to the BSWA official website or contact the sales department.
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Hardware Details
⚫ CA918 Free-field Standard Sound Source: 3.5-inch high-sensitivity speaker unit, frequency range 125 Hz–20 kHz, for use in anechoic or free-field environments; compliantwith JJG1172 working standard microphone (free-field comparison method) regulations.
⚫ CA925 High Sound Pressure Calibrator: Produces stable 170 dB@500 Hz; compliant with JJF1738 for dynamic range calibration.
2. Data Acquisition
⚫ NI PXIe dual-channel input/output data acquisition hardware, 204.8 kHz, 24-bit,Thunderbolt interface.
6. Others
⚫ CS002 Microphone Test Stand: Sound isolation chamber with built-in banana socket,excellent isolation performance.
Software System
The CAS901 system uses BSWA's self-developed VA-Audio test software, designed for performance testing of electroacoustic products such as speakers, microphones, and mobile phones.
VA-Audio, together with dual-channel input/output acquisition, controls signal acquisition and output for complex electroacoustic tests including frequency response, sensitivity, and phase difference.
Recommended Installation Configuration
⚫ Processor: Pentium 2GHz or higher, dual-core recommended Operating System: Windows NT 4.0, 2000, XP, or Vista Memory: 1GB
⚫ Hard Drive: 60GB
⚫ Monitor: 14 inches
Test Interfaces
Test Schemes
1. Electrostatic Actuator Test Method
Designed according to JJG 175-2015, can measure:
⚫ Pressure field frequency response (20 Hz–100 kHz)
⚫ Sensitivity
⚫ Phase difference
⚫ Harmonic distortion
VA-Audio supports importing free-field correction values and automatically generates corrected frequency response curves.
2. Free-field Test Method
⚫ Microphone dynamic range upper limit
Download information:
CAS901 BSWA Measurement Microphone Verification and Calibration System
