Svantek UK

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. 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.

Microtech Gefell


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Converter type Capacitive pressure receiver
Frequency range of the free field transmission factor ± 2 dB 3.5 Hz to 20 kHz
Idle transmission coefficient 50 mV / Pa
No-load transmission factor re 1 V / Pa -26 dB ± 1.5 dB
Limit sound pressure level for 3% distortion factor at 1kHz Peak, with MV 204 @ 120 V 149 dB
RMS, with MV 204 @ 120 V 146 dB
Self-noise with preamplifier MV 204 15 dBA
Polarization voltage 0 V
Capacity at 1 kHz 17 pF
Working temperature range – 50 ° C to +100 ° C
Temperature coefficient ≤ 0.01 dB / K
humidity up to 70 ° C, 90%
Static pressure coefficient -0.00001 dB / Pa
diameter without protective cap 12.7 mm ± 0.05 mm
with protective cap 13.2 mm ± 0.05 mm
height 16.4 mm
Weight 7.5 g
Thread for preamplifier 11.7mm 60 US
Thread for protective cap 12.7mm 60 US


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