Notice of Changes in Specification Notation of MI-1531 Measurement Microphone and Correction of MI-3140 Preamplifier
17 March 2025
Please be informed that we have reviewed and revised the specification notation of MI-1531.
Previously, the performances of the microphone alone were described in the specifications of the MI-1531. However, since this product is used in combination with the preamplifier MI-3140, we have revised the specifications to reflect when used in combination with the MI-3140 as the official description to avoid misunderstanding.
In addition, there was an error in the description of the attenuation in the specifications of the preamplifier MI-3140, thus we have also corrected it.
We sincerely apologize for any inconvenience caused.
Revised specifications
For detailed specifications, please refer to the product homepage.
| Before revision | After revision | |
|---|---|---|
| Frequency range (250 Hz as reference) |
without protection grid : 10 Hz to 40 kHz (±1 dB) 10 Hz to 100 kHz (+2 dB, -4 dB) |
without protection grid : 10 Hz to 40 kHz (±2 dB) 10 Hz to 100 kHz (+2 dB, -4 dB) |
| Maximum sound pressure | 166 dB | 157 dB (when using MI-3140) |
| Self-noise level (A-weighting) |
30 dB | 37 dB (Typ. Value) (when using MI-3140) |
| Operating temperature range | -40 °C to +150 °C | -30 °C to +60 °C (when using MI-3140) |
Correction of error
| Before revision | After revision | |
|---|---|---|
| Attenuation | 0.25 dB (Typ. value) | 0.35 dB (Typ. value) |