Technical Column
Efficient Acoustic Testing for Compact Electric Devices — EAAC × HBK Analysis Enables Fast, Reliable Mass Production Checks —
Sep 10, 2025
- HBK × SONORA Acoustic Measurement Solution Official Website
- Technical Column
- Efficient Acoustic Testing for Compact Electric Devices — EAAC × HBK Analysis Enables Fast, Reliable Mass Production Checks —
Electroacoustic Measurement
Introduction: Small Devices, Big Challenges in Acoustic Testing
As smart appliances, small fans, pumps, and electric modules become more widespread, low-noise performance has become a key quality indicator.
But testing compact devices acoustically poses a dilemma:
- Output levels are low
- Structures are complex
- Inspection needs to be fast and automated
Precision and speed rarely go hand in hand—unless the environment and instruments are built for it.
Solution: EAAC × HBK for High-Speed, Noise-Free Testing
At Moritani, we deliver optimized setups using:
Test Environment
EAAC (Electroacoustic Anechoic Chamber)
Compact, quiet, reflection-free environment for clean measurements
Sensors & Analysis
HBK Microphones × PULSE System
FFT analysis, NG thresholds by frequency band, automated judgment logic
Automation Options
- Automatic chamber doors
- Robotic DUT loading
- Complete cycle: signal generation → measurement → pass/fail output
Workflow Example: Inline Testing for Portable Pumps
- 1. Device is automatically loaded into EAAC from conveyor
- 2. HBK microphone captures operational sound
- 3. FFT data is compared against a stored reference spectrum
- 4. PULSE outputs OK/NG result to PLC → sorting mechanism handles it
The entire cycle takes only 3–5 seconds, enabling real-time judgment with no offline processing.
Why EAAC Is Ideal for Compact DUTs
- Even in 1–2 m² space, true free-field conditions are achieved
- Easy to install and relocate—perfect for flexible line expansion
- Designed for acoustic compatibility with HBK sensors
For small devices, even minor reflections or ambient noise can distort results. EAAC offers the environmental stability needed for precision.
Customization Options Available
- Custom chamber dimensions for your DUT size
- Acoustic layout optimized for your target frequency range
- Integrated automation and pass/fail interfaces
- Full integration support with HBK microphones and analyzers
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Contact Us
- Contact us by email
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- Contact us by phone
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Moritani Shokai
(Machinery Department No. 2, Tokyo Head Office)
Introduction of the Manufacturer
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Hottinger Bruel & Kjaer
HHBK is a merger of two companies: Brüel & Kjær of Denmark and HBM of Germany.
Brüel & Kjær is one of the world’s leading manufacturers of acoustic and vibration measurement instruments, known as a total measurement chain supplier.Learn more about HBK
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Sonora Technology Co., Ltd.
Sonora Technology is a leading Japanese manufacturer of industrial anechoic chambers and anechoic boxes.
From design and manufacturing to installation and acoustic performance assurance, Sonora provides fully integrated solutions to build complete acoustic measurement environments from the ground up.Learn more about Sonora
Contact / Request Brochure
For inquiries or consultations regarding the total solutions provided by HBK × Sonora, please feel free to contact us using the Contact button.
If you would like a brochure sent by mail, please use the Request Brochure button.