4953 ½'' Pressure-field Microphone, Prepolarized, 50 mV/Pa, 3 Hz-10 kHz

This high sensitivity microphone is optimised for pressure-field response as required in applications such as coupler measurements. A good diffuse-field response also makes it well-suited for in-cabin noise measurements up to 10 kHz.

Product Data

Uses

Coupler measurements
Hearing aid testing
Telephone testing
In-cabin measurements
Measurements to ANSI standards

Features

Sensitivity: 50 mV/Pa
Frequency: 3 – 10 000 Hz
Dynamic Range: 16.2 – 146 dB
Temperature: –30 to +150˚C (–22 to +302˚F)
Prepolarized: connects directly to CCLD input

Use of Pressure-field Microphones

A pressure-field is characterised by a sound pressure that has the same magnitude at any position within the field. Pressure fields can be found when measuring sound in enclosures or cavities that are small compared to the wavelength. For measurements to be made close to hard reflective surfaces or inside closed couplers, a pressure-field microphone is the best choice.

The frequency response of Type 4953 has been carefully designed in such a way that this microphone also has a good random incidence response, making it suitable for in-cabin noise measurements, for instance in the automotive industry.

Manufacturing and Stability

The use of a press-fitted stainless steel diaphragm and the assembly of the microphone in a clean room environment, ensure superior long-term stability, and suitability for use in high-humidity environments with negligible error.

Calibration of Sensitivity and Frequency Response

Each Type 4953 comes with an individual calibration chart showing open-circuit sensitivity, as well as frequency response in both the pressure and diffuse field. An enclosed mini CD contains a wealth of technical information, such as the influence of accessories, free-field corrections, etc.

For a full Description and Specifications, see Product Data