To help test and acoustic engineers achieve accurate measurements in everyday tasks, a miniature microphone has been developed that is ideal for high-precision acoustic measurements tests within confined spaces
Brüel & Kjær, the leader and developer in sound and vibration solutions, has released Type 4988-A microphone that is a 1/4 inch low noise microphone, optimized for use with couplers, audio device sound ports or flush-mounting measurements and other pressure-field applications. The microphone can also be used as a general measurement device for inclusive electronics corrections. This includes response at different angles of incidence in a free field, corrections in a diffuse field or grid influence.
Suitable for various acoustic tests
The Type 4988-A microphone has a diaphragm that is connected to a 1/4″ Constant Current Line Drive (CCLD) preamplifier. An all-titanium design ensures high resistance to corrosion and maintains suitability for a range of acoustic tests, even in the presence of magnetic fields.
The microphone is completely 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), makes the device ideal for integration in a production line or for general audio measurements.
All measurements meet the industry standard IEEEP1451.4 V1.0.