Gefell MM225
The 1/2" Measuring Microphone MM225 offers facilities for the use of a high-quality prepolarized measuring microphone capsule type MK255 on systems with phantom power inputs
The 1/2" Measuring Microphone MM225 offers facilities for the use of a high-quality prepolarized measuring microphone capsule type MK255 on systems with phantom power inputs.
The measuring microphone is connected to the measuring channels via a force-fitting 2 m cable inclusive XLR connector.
The microphone holder MH 64 with 1/2" clamp is recommended for mounting. The 1/2" measuring microphone capsule accessories, e.g. windscreen, nose cone, dehumidifier, etc. can be used additionally.
The measuring microphone can be calibrated with the Pistonphone type 5002 or other current sound pressure calibrators.
Specifications
Transducer type: Capacitive pressure transducer, acc. WS2F (DIN EN IEC 61094-4)
Loaded Sensitivity: 50 mV/Pa
Loaded Sensitivity: -26 dB ±1,5 dB re 1V/Pa
Correction free-field at 1 kHz: 0 dB
Random incidence at 1 kHz: 0 dB
Principal axis microphone axis: 3,5 Hz ... 20 kHz, class 1 DIN EN 60 651
Polarization voltage: 200 V
>138 dB
Output voltage: 7,5 Veff at 1 kHz / 1% THD
Output impedance: < 100 Ohm
Nom. load impedance: 100 kOhm
Time for power up: 1 min.
Equivalent loudness level DIN EN 60651: 15 dBA
Influence of magnetic field 80 A/m, 50 Hz: < 22 dB
Influence of vibration 1 m/s²: 60 dB (20 Hz bis 1 kHz)
Operating temperature range ± 0,5 dB: -25 °C to +100 °C
Main ambient temperature coefficient: 0,01 dB/K
Main ambient pressure coefficient: 1x10-5 dB/Pa
Humidity limits: r.H. < 100%, absence of condensation
Temperature limits: -50 °C to +100 °C
With protection grid: 13,2 + 0,05 mm
Without protection grid: 12,7 + 0,05 mm
Preamplifier thread: 11,7 mm 60 UNS
Protection grid thread: 12,7 mm 60 UNS
Plug: XLR
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