1/4-inch Measurement Microphone and Preamplifier
The 1/4-inch diameter condenser microphone MI-1531 with its preamplifier MI-3140 enable to measure the high frequency band more than 20kHz which it is impossible by using the 1/2-inch microphone. Amplifier is not required in use as it is a back electret-type condenser microphone, which differs from a bias-type microphone. And also, the MI-1531 achieves a measurement at Max. 168 dB as a performance of a microphone itself.
MI-1531 Adopting back-electret type
The MI-1531 does not need bias-type microphone preamplifier because it is combined with a constant current type of preamplifier. It can be directly connected to an amplifier or a data processing unit which have a BNC (C02 type) connector. (Constant current power supply at the range from 2mA to 20mA is required at the equipment.)
MI-3140 Achieving high-frequency measurement more than 20kHz
The MI-1531 enables to measure the high frequency band more than 20kHz which it is impossible by using the 1/2-inch diameter microphone.
10 Hz to 40 kHz
(Frequency characteristic: ±1dB without protection-grid) 10 Hz to 100 kHz
(Frequency characteristic: +2dB,-4dB without protection-grid)
10 Hz to 20 kHz
(Frequency characteristic: -4dB with protection-grid)
Able to measure the high sound pressure Level
The MI-1531 achieves a measurement at Max. 168dB as a performance of a microphone itself and 157dB in combination with the MI-3140 preamplifier
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