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Measuring Microphone Capsule MK 231 E

The 1/2 ”measuring microphone capsule MK 231 E is used for acoustic measurement technology in acoustic couplers and in diffuse sound fields.



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The diffuse field equalized microphone capsule has a straight frequency response of the pressure transmission factor up to 8 kHz.

The design concept of the microphone capsule is the same as that of the MK 221.

The static pressure equalization between the inner cavity and the atmosphere is ensured via a capillary to the downstream preamplifier. This enables the use of the drying adapter TA 202.

The internationally common thread type (60 UNS) for connecting the microphone capsule allows interchangeability with other 1/2 ”microphone capsules and enables connection to all suitable calibration and measuring devices.

Converter typeCapacitive pressure receiver
Frequency range of the pressure transmission factor3.5 Hz to 8 kHz (± 1 dB)
Frequency range of the diffuse field transmission factor3.5 Hz to 12.5 kHz (± 1.5 dB)
Idle transmission coefficient50 mV / Pa
No-load transmission factor re 1 V / Pa-26 dB ± 2.5 dB re 1V / Pa
Limit sound pressure level for 3% harmonic distortion at 1 kHz146 dB
Self-noise with preamplifier MV 20415 dBA
Polarization voltage0 V
Capacity at 1 kHz16 pF
Working temperature range– 50 ° C to +100 ° C
Temperature coefficient≤ 0.01 dB / K
Static pressure coefficient-1 x 10⁻⁵ dB / Pa
diameterwithout protective cap12.7 mm ± 0.02 mm
with protective cap13.2 mm ± 0.02 mm
height16.4 mm
Weight9 g
Thread for preamplifier11.7mm 60 US
Thread for protective cap12.7mm 60 US


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