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Measurement Microphone Capsule MK 255

The MK 255 has a free field equalised frequency response of the transmission factor and is specially designed for acoustic measurements in a free sound field with an angle of incidence of 0 degrees.


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The static pressure equalisation takes place via a capillary to the downstream preamplifier (rearvented). The measuring microphone capsule is suitable for class 1 sound level meters according to IEC 61672.

Converter typeCapacitive pressure receiver
Frequency range of the free field transmission factor± 2 dB3.5 Hz to 20 kHz
Idle transmission coefficient50 mV / Pa
No-load transmission factor re 1 V / Pa-26 dB ± 1.5 dB
Limit sound pressure level for 3% distortion factor at 1kHzPeak, with MV 204 @ 120 V149 dB
RMS, with MV 204 @ 120 V146 dB
Self-noise with preamplifier MV 20415 dBA
Polarization voltage0 V
Capacity at 1 kHz17 pF
Working temperature range– 50 ° C to +100 ° C
Temperature coefficient≤ 0.01 dB / K
humidityup to 70 ° C, 90%
Static pressure coefficient-0.00001 dB / Pa
diameterwithout protective cap12.7 mm ± 0.05 mm
with protective cap13.2 mm ± 0.05 mm
height16.4 mm
Weight7.5 g
Thread for preamplifier11.7mm 60 US
Thread for protective cap12.7mm 60 US


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