1/4-inch Measurement Microphone and Preamplifier
MI-1531/MI-3140
MI-1531
MI-3140
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
System configuration
Each product in the analyzer section in the below configuration is linked to its HTML page.
Specifications
MI-1531 1/4-inch Measurement Microphone
| Response Type | Free sound field |
|---|---|
| Positive voltage | 0 V |
| Sensitivity | -48 ± 3 dB re. 1 V/Pa 4 mV/Pa (250 Hz) |
| Capacitance | 7 pF |
| Frequency range | 10 Hz to 100 kHz (Up to 20 kHz when used with the SR-2210) |
| Effective load volume | 0.6 mm3 (250 Hz) |
| Maximum sound pressure level | 157dB (when used with MI-3140 preamplifier) |
| Self-noise level | 30 dB or less(A-weighting) |
| Operating temperature range | -30 to 60°C |
| Operating humidity range | 0 to 90% (with no condensation) |
| Storage temperature range | -30 to 80°C |
| Storage relative humidity range | 0 to 90% (with no condensation) |
| Weight | Approx. 1.5 g |
| Outer dimension | φ 6.9 mm x 10.5 mm |
MI-3140 Preamplifier
Applicable Microphone |
MI-1531 |
|---|---|
| Insertion Loss | 0.25dB (Representative value) |
| Frequency Range | 10 Hz to 100 kHz (within ±0.5 db) (Up to 20 kHz when used with the SR-2210.) |
| Input resistance | Approx. 20 GΩ |
| Self-noise level | 2.5 μV or less (20 Hz to 20 kHz) |
| Max Output voltage | ±8 V (at power supply 24 VDC) |
| Output resistance (at 1 kHz) | 50 Ω |
| Operating Temperature Range | -30 to 60°C |
| Operating Humidity Range | 0 to 90% (with no condensation) |
| Storage temperature range | 30 to 80°C |
| Storage humidity range | 0 to 95% (with no condensation) |
| Power supply | CCLD 2 to 20 mA, 18 to 25 VDC |
| Applicable connector | 10-32 UNF |
| Weight | Approx. 5.5 g (not including microphone) |
| Outer Dimensions | φ 6.35 mm x 44 mm |
| Accessories | Protection cap for input connector x 1 |
| SC-0313 conversion adapter (1/2 to 1/4 inch) x 1 | |
| Connection cable | NP-0130 series (recommended) |
Cable
| Model | Length | Notes | |
|---|---|---|---|
| NP-0131 |  Miniature connector |
1.5 m | Required separately NP-0021 |
| NP-0132 | 3 m | ||
| NP-0133 |
5 m | ||
| NP-0134 | 10 m | ||
| MX-1001 | Low temperature / high temperature specification signal cable |
1.5 m | -30 to +80 ℃ |
| MX-1005 | 5 m | ||
| MX-1020 | 20 m | ||
| MX-2001 |  |
1.5 m | 0 to +60 ℃ |
| MX-2005 | 5 m | ||
| MX-2020 | 20 m |
Revised:2021/04/27
