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A mini, yet mighty microphone


To help engineers and acousticians achieve accurate measurements in everyday tasks, Bruel & Kjaer has created a miniature microphone ideal for high-precision acoustic measurements tests within confined spaces – Type 4988-A.

The ¼ inch low noise microphone is optimized for use in pressure-field applications such as use with couplers, measuring close to audio device sound ports or flush-mounting. The microphone also works as a general measurement device when the operator makes use of the inclusive electronics corrections; these include response at different angles of incidence in a free field, corrections in a diffuse field or grid influence.

The microphone has a laser welded diaphragm and is paired to a ¼" Constant Currant Line Drive (CCLD) preamplifier. This connects to CCLD input conditioning, ensuring all measurements meet the industry standard IEEEP1451.4 V1.0.

Type 4988-A’s all-titanium design is highly resistant to corrosion and suitable for a range of acoustic tests, even in the presence of magnetic fields. It’s practically immune to temperature and humidity changes; this extreme stability, combined to a minimal spread in frequency response between individuals (guaranteed ±1 dB from 20Hz to 20KHz), make it ideal for integration in a production line or for general audio measurements.

About Hottinger Brüel & Kjær

HBK provides a complete portfolio of solutions across the test and measurement product life cycle, that unite the physical world of sensors, testing and measurement with the digital world of simulation, modelling software and analysis. By creating a scalable and open data acquisition hardware, software and simulation ecosystem, product developers can cut time-to-market, drive innovation and take the lead in a highly competitive global marketplace.

For more information, please visit www.hbkworld.com

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