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 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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