The 1/4” MK 301 measuring microphone capsule is designed for acoustical measurements in research and development and also for industrial use. Some applications include audiometry, the measurement of building acoustics and noise levels.

The equalization of the static air pressure between the inside and outside of the capsule is by means of a capillary tube side-vented.
The individual pressure frequency response curves can be convenient measured by using a calibration grid, e.g. UA 0033 by means of the adaptor DB 0264.
The capsule uses the international standard thread 60 UNS which ensures compatibility with a wide range of calibration equipment and measurement devices available from many manufacturers.
Measuring microphone cartridge MK 301 and measurement microphone preamplifier MV 302/ MV 301 can be calibrated.

In order to maintain its functioning the measurement microphone capsule should be protected against mechanical damage. It should be disconnected from its power source and completely checked for any pollution in regular intervals that have to be defined depending on the operating conditions.
After removal of the protection grid the pollution within the grid and on the diaphragm should be cleaned very carefully with a soft clean cloth or brush.
The measurement microphone capsule is not suitable for use in chemical aggressive conditions and in conductible dust. Condensation must be avoided.