Good under pressure

01 Oct 2020

To help engineers and acousticians achieve accurate measurements in everyday applications, Brüel & Kjær has created Type 4971-H-041 – a robust and reliable ½-inch CCLD pressure-field microphone.

This new version is a combination of a ½-inch prepolarized pressure-field microphone cartridge (Type 4971) and a high temperature ½-inch Constant Current Line Drive (CCLD) preamplifier, which connects to CCLD input conditioning, thus ensuring all measurements can be conducted using a general data acquisition system.

Type 4971-H-041 is optimized for use in pressure-field applications, such as with couplers measuring close to audio device sound ports or flush-mounting.

It’s also suitable for random incidence measurements and free-field measurements with 90°C incidence. This makes it ideal for measuring moving objects like trains or planes, as  even though the object is moving  the frequency characteristics remain the same.

The microphone’s wide frequency range (5 Hz to 20 kHz, ±2 dB), broad dynamic range (20 dB(A) to 146 dB) and immunity to harsh, unpredictable environments also makes it suitable for component testing within the telecom, audio, automotive and aerospace industries.

More information: Microphone Type 4971-H-041

About Brüel & Kjær
Brüel & Kjær focuses on sound and vibration solutions and develops advanced technology for measuring and managing sound and vibration. As a specialist in this domain, the company helps customers ensure component quality, enhance product performance and monitor operational compliance.

For more than 75 years, Brüel & Kjær’s research and development people have excelled and many have become recognized global experts, who aid the scientific community and teach at renowned centres. The application of experience and technology promotes quality and efficiency at every stage of a product’s life cycle: design, development, manufacture, deployment and operation. Mastering sound and vibration is a key component in accelerating business growth and improving environmental quality.

About HBK – Hottinger, Brüel & Kjær
HBK – Hottinger, Brüel & Kjær, home to the HBM Test and Measurement and Brüel & Kjær Sound and Vibration brands, is a subsidiary of UK-based Spectris plc (, which has annual sales of £1.5 bn and employs approximately 9800 people worldwide.

For more information, please visit HBK website

For additional information, please contact:
Heather Wilkins
Marketing Coordinator
Brüel & Kjær

Telephone: 01223 389 800
Email: [email protected]