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.
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 type||Capacitive pressure receiver|
|Frequency range of the pressure transmission factor||3.5 Hz to 8 kHz (± 1 dB)|
|Frequency range of the diffuse field transmission factor||3.5 Hz to 12.5 kHz (± 1.5 dB)|
|Idle transmission coefficient||50 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 kHz||146 dB|
|Self-noise with preamplifier MV 204||15 dBA|
|Polarization voltage||0 V|
|Capacity at 1 kHz||16 pF|
|Working temperature range||– 50 ° C to +100 ° C|
|Temperature coefficient||≤ 0.01 dB / K|
|Static pressure coefficient||-1 x 10⁻⁵ dB / Pa|
|diameter||without protective cap||12.7 mm ± 0.02 mm|
|with protective cap||13.2 mm ± 0.02 mm|
|Thread for preamplifier||11.7mm 60 US|
|Thread for protective cap||12.7mm 60 US|