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H5: January 5, 2024 Madrid

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 HBK

Accelerate your product innovation with HBK solutions in virtual, physical and in-process testing.  From the electrification of mobility to the advancement of smart manufacturing, we support you throughout the entire product lifecycle, sharing your mission for a cleaner, healthier, and more productive world.