Pressure-field microphone is for confined spaces
For acoustic measurement tests within confined spaces, Brüel & Kjær offers the 4988-A pressure-field microphone.
The quarter inch, low noise microphone is optimised for use in pressure-field applications such as those using couplers, measuring close to audio device sound ports or flush-mounting. The microphone also works as a general measurement device when using the inclusive electronics corrections, which 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 quarter inch constant current line drive (CCLD) preamplifier. This connects to CCLD input conditioning, ensuring all measurements meet the industry standard IEEEP1451.4 V1.0.
The all-titanium design of the 4988-A’s is resistant to corrosion and suitable for a range of acoustic tests, even in the presence of magnetic fields. According to Brüel & Kjær, it is practically immune to temperature and humidity changes. This stability, combined with a minimal spread in frequency response between individuals (guaranteed ±1 dB from 20Hz to 20kHz), make it particularly suitable for integration in a production line or for general audio measurements.
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 staff have supported the scientific community. Mastering sound and vibration is a key component in accelerating business growth and improving environmental quality.
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 which employs approximately 9,800 people worldwide.
