FrontFrontRearRearFor using an anechoic chamberAnechoic chamberSound calibratorMicrophoneMicrophoneCouplerSoundlevel meterSound level meterSwapSwapSwapElectrical test“We o en got requests from cus-tomers who wanted to install a system like this in their own facilities. In addi-tion to the target instrument, this would involve installing an anechoic chamber or reverberation room suitable for cali-bration. at’s why Rion decided to pro-vide not just the system, but the whole package—from the design of the anechoic chamber to RACS installation, technical training, and support a er operation start. Providing comprehen-sive support in response to the request from our customers wishing to intro-duce a system that meets the require-ments of JIS and IEC standards. at’s the essence of RACS.” e acoustic coupler is one of the innovative features of RACS. Broadly speaking, there are two acoustic calib-ration methods for sound level meters and microphones: the anechoic cham-ber method and the comparison cou-pler method. e anechoic chamber method allows high-precision calibra-tion, but the chambers are costly to install. So the comparison coupler meth-od is also widely used for simple cali-bration using a correction value.“In other words, there’s a demand and a need for both anechoic chambers and couplers. Conventionally, you had to choose one system or the other or install both. RACS lets customers per-form both anechoic chamber and acoustic coupler calibration with a sin-gle system, which provides a great deal of freedom with regard to system archi-tecture. at’s one of RACS’s advan-tages. In addition, the system has preset parameters for calibrating or testing Rion’s sound level meters. e system completes automatic tests in just about 45 minutes. Conventional systems can take more than three times as long.” e Role of RACS in SocietyHosoi, who devotes his days to over-seas sales activities, analyzes how RACS can contribute to societies in foreign countries and what it o ers ordinary consumers.“ e need to manage the perfor-mance of devices like sound level meters according to international regulations and standards arises mainly in govern-ments and other public age n cies. A country will typically have a primary standard calibration system, then sec-ondary calibration systems based on the primary system. e need for RACS is stronger in countries where the pri-mary calibration system is in the pro-cess of being established and access to secondary calibration systems is limit-ed, as in Southeast Asian nations like Vietnam, Malaysia, and ailand. If RACS enters widespread use in these countries, it might help make noise- lled environments more pleasant plac-es to live. Another area of application might be industries related to automo-biles and home electronics, where there’s growing global demand for higher quality products. I think busi-nesses can enhance their position by incorporating precision management of their sound level meters and other instruments. Lastly, work environments in many industries are beset with con-tinuous noise and vibration. Precision management using sound level meters and vibration meters will improve work environments and help maintain work-er health at high levels.” e Firm Character of the Programmer Who Created the Heart of RACSNaturally, building so ware was a key aspect in the development of RACS. e man placed in charge of developing this so ware was Junichi Funaki of the Manufacturing Engineering Depart-ment in the Environmental Instrument Division. Funaki recalls the days being in sole charge of developing the RACS so ware.“Until then, measurements of sound level meters and microphones had been done manually. is system made it possible to do this completely automati-cally, meaning all the operator has to do is press the button to start the measure-ment. From there, the measurement proceeds automatically. Simplicity of use is a major feature of RACS. RACS can also measure various devices using a single system. All this might sound simple and straightforward. But from start to nish, it took ve years to devel-op the hardware and the so ware.”Funaki adds nonchalantly with a smile that his work basically consisted of establishing communication with sound level meters and obtaining mea-surements. Development on this scale typically takes multiple programmers. Funaki did all the work on his own. is is his take on the feat.“Building an optimal program for each of dozens of di erent devices is a formidable task,” says Funaki, recalling Screenshot of RACS measurement resultsThe screen for presenting the measurement results was designed by Funaki, who was in charge of programming. The colors used in the plot reflect Funaki’s aesthetic tastes.Example of System Architecture of RACSThe RACS exhibits the full scope of its performance capabilities when these instruments are assembled into a single system. Based on our expertise as a JCSS accredited business, we deliver a service package to Thailand and Malaysia that includes this calibration system that conforms to the IEC standard. This achievement showcases on the world stage Rion’s advanced technologies in the field of sound and vibration measurement.3Junichi FunakiS&V Engineering Section, Manufacturing Engineering Department, Environmental Instrument Division. After participating in software development for hearing aid t-ting, he was assigned to general program-ming in his present section. He played a central role in software development for the RACS development project.
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