1/4-inch Measurement Microphone and Preamplifier

MI-1531/MI-3140

 

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

Photo (MI-1531 Measurement Microphone)

 

MI-3140

Photo (MI-3140 Preamplifier)

  • 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.)

 

  • 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

 

Connection Diagram

Each product in the analyzer section in the below configuration is linked to its HTML page.

 

Illustration (1/4-inch Microphone Connection Diagram) Illustration (1/4-inch Microphone Connection Diagram) Illustration (1/4-inch Microphone Connection Diagram) Illustration (1/4-inch Microphone Connection Diagram) Illustration (1/4-inch Microphone Connection Diagram) Illustration (1/4-inch Microphone Connection Diagram) Illustration (1/4-inch Microphone Connection Diagram)

 

Specifications

MI-1531 1/4-inch Measurement Microphone

Frequency Range 10 Hz to 100 kHz (Up to 20 kHz when used with the SR-2210.)
Response Type Sound Field
Sensitivity -48 ± 3 dB re. 1 V/Pa   4 mV/Pa (250 Hz)
Capacitance 7 pF
Max. 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 Approx. 1.5 g

MI-3140 Preamplifier

Applicable Microphone

MI-1531
Frequency Range 10 Hz to 100 kHz (reference : 0.5 dB or less) (Up to 20 kHz when used with the SR-2210.)
Insertion Loss -0.25dB (Typical)
Input Resistance Approx. 20 GΩ
Intrinsic Noise 6 μV or less (20 Hz to 20 kHz)
Distortion 3% or less (Input effective voltage 8 V)
Operating Temperature Range -30 to 60°C
Operating Humidity Range 0 to 90% (with no condensation)
Max Output ±8 V or less
Power Supply Voltage 15 to 25 V DC, 2 to 20 mA
Outer Dimensions φ 6.35 ÁE44 mm
Weight Approx. 5.5 g
Connection cable NP-0130 series (sold separately)
Accessories SC-0313 conversion adapter (1/2 to 1/4 inch)
Option
  • NP-0021 BNC (C02 Type) conversion adapter
  • NP-0020 connector (for NP-0130 series)

 

Cable

Model Length Outer dimension
NP-0131 1.5m
Illustration (NP series cable)
NP-0132 3m
NP-0133 5m
NP-0134 10m

Revised:2017/06/30



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