Measurement Microphone MM 302
The 1/4 ”measuring microphone MM 302 opens up the possibility of using high quality, externally polarized measuring microphone capsule MK 301 on measuring systems with 7-pin. LEMO connection to be used.
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The electrical connection is made via a permanently connected, three-meter-long cable including a 7-pin LEMO connector.
The MH 64 microphone holder with a 1/4 ”cone is recommended for holding the microphone. The use of the 1/4 ”measuring microphone capsule accessories, such as a windshield etc., is possible without any problems.
The measurement microphone can be calibrated with the Pistonfon Type 5002 or with other suitable sound pressure calibrators using a 1/4 “adapter.
| Converter type | Capacitive pressure receiver, according to WS3F (DIN EN IEC 61094-4) | |
| Operating transfer coefficient | 5 mV / Pa | |
| Operational transmission rate | -46 dB ± 1.5 dB re 1V / Pa | |
| Free field correction for 1 kHz | 0 dB | |
| Diffuse field correction for 1 kHz | 0 dB | |
| Reference direction | Microphone axis | |
| Frequency range of the free field transmission factor | 5 Hz to 100 kHz (± 2 dB) | |
| Polarization voltage | 200 V | |
| Limit sound pressure level for 3% harmonic distortion at 1 kHz | 168 dB | |
| Limit sound pressure level | with reduced no-load supply voltage (UL = 28 V DC) | 157 dB |
| Output voltage | ≤ 35 Veff | |
| Output impedance | <100 ohms | |
| Nominal terminating impedance | 100 kOhm | |
| Start-up time | 1 min. | |
| Equivalent noise level DIN EN 60651 | 35 dBA | |
| Magnetic field influence 80 A / m, 50 Hz | ||
| Influence of mechanical vibrations 1 m / s² | ||
| Working temperature range ˂ ± 0.5 dB | -25 ° C to +100 ° C | |
| Moisture limits | rH <100%, condensation not allowed | |
| Temperature coefficient | ≤ 0.01 dB / K | |
| Static pressure coefficient | 1×10-5 dB / Pa | |
| Temperature limits | -50 ° C to +100 ° C | |
| diameter | with protective cap | 6.35 mm ± 0.02 mm |
| without protective cap | 7.0 mm ± 0.02 mm | |
| length | ||
| Weight | ||
| Thread for preamplifier | 5.7mm 60 US | |
| Thread for protective cap | 6.35mm 60 US | |
| Connectors | 7pol. Lemo | |
| Memory for microphone identification | – | |
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