Calibration microphone TYPE 4138

frequencypolarizedpressure

Pressure-field microphone designed for very high-frequency measurements in confined spaces with a frequency range Type 4138 is designed for high-level and very high-frequency measurements and measurements in confined spaces. Being externally polarized, Type 4138 must be used with a classical preamplifier. High-level and very high-frequency measurements Pulse measurements Applications which require a high degree of spatial resolution or where space is limited, for example, model testing USE OF PRESSURE-FIELD MICROPHONES Pressure-field microphones should be used for making measurements in small, closed couplers or close to hard, reflective surfaces. Such microphones are optimised to have a flat frequency response in a pressure field. Because of its small size, Type 4138 can also be used for random-incidence measurements at audio frequencies, where its frequency response is less dependent on angle of incidence.