Measuring Microphone Capsule MK 301 E
The 1/4 ”measuring microphone capsule MK 301 E is designed for acoustic measurements in research, development and industry and is also used in building acoustics and audiometry.
The measuring microphone capsule has a fixed charge-carrier layer (back electret) to provide the polarization voltage.
The careful construction and the constructive concept of the microphone capsule guarantee a high temporal constancy of the electroacoustic parameters. All important parts, including the membrane manufactured and fixed in a special galvanic process, are made of nickel. The membrane is protected from mechanical damage by a protective cap. The static pressure equalization between the inner cavity and the atmosphere is ensured via a capillary to the downstream preamplifier.
The internationally common thread type (60 UNS) for connecting the microphone capsule allows interchangeability with other 1/4 “microphone capsules and enables connection to all suitable 1/4” or 1/2 “calibration and measuring devices.
The MK 301 measuring microphone capsule is suitable for class 1 sound level meters according to IEC 61672.
|Converter type||Capacitive pressure receiver|
|Frequency range||5 Hz to 100 kHz (± 2 dB)|
|Idle transmission coefficient||3.5 mV / Pa|
|No-load transmission factor re 1 V / Pa||-49 dB ± 1.5 dB re 1V / Pa|
|Limit sound pressure level for 3% harmonic distortion at 1 kHz||168 dB|
|Self-noise with preamplifier MV 203||36 dBA|
|Polarization voltage||0 V|
|Capacity at 1 kHz||4.5 pF|
|Working temperature range||– 20 ° C to +100 ° C|
|Temperature coefficient||≤ 0.01 dB / K|
|Static pressure coefficient||-1 x 10⁻⁵ dB / Pa|
|diameter||without protective cap||6.35 mm ± 0.02 mm|
|with protective cap||7.0 mm ± 0.02 mm|
|Thread for preamplifier||5.7mm 60 US|
|Thread for protective cap||6.35mm 60 US|