Measurement Microphone


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. An 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.

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Frequency Range 10 Hz to 100 kHz
Responce Type Sound Field
Sensitivity -48 ± 3 dB re. 1 V/Pa 4 mV/Pa (250 Hz)
Capacitance 7 pF
Maximum Sound Pressure Level 157dB (When used with MI-3140 preamplifier)
Intrinsic Noise Level 30 dB or less (A-weighting)
Operating Temperature Range -10 to 50°C
Operating Humidity Range 0 to 90% (With no condensation)
Temperature Characteristics 0.01dB/K or less
Storage Temperature Range -40 to 150°C
Storage Humidity Range 0 to 90%
Outer Dimensions φ 6.9 ÁE10.5 mm
Weight Approximately 1.5 g


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