How to measure the frequency characteristics of a compact speaker simply and quickly in a mobile phone etc.
Example 5 : Further analysis - Level judgment of sound pressure from a speaker of a mobile phone
(using MI series, MI-3111, CF-4700, SR-2210, and a PLC)
Before starting measurement, perform sound pressure unit calibration of the CF-4700A (FFT Comparator) side by using the SC-2500A (Sound calibrator).
Make a sound of a mobile phone incoming, and detect the sound by the MI series (microphone). Analysis with the Peak average function of the power spectrum allows the display both X axis as frequency and Y-axis as sound pressure level.
Pass/fail judgment is made according to the sound pressure level of the analysis result and make contact output. You can control a measurement start/stop signal by an external device such as a PLC.
System configuration
| Model name | Product name | Remarks | |
|---|---|---|---|
1 |
MI-1235 | Measurement microphone | Measurement frequency range : 20 Hz to 20.0 kHz |
2 |
MI-3111 | Preamplifier | 20 Hz to 20 kHz |
| 3 | MX-105 | Signal cable | 5m |
| 4 | MX-101 | Signal cable | 1.5m |
| 5 | SR-2210 | 2ch Sensor amplifier | 1 Hz to 20 kHz (±0.5 dB) |
| 6 | CF-4700A | FFT Comparator | 1ch, 1 Hz to 40 kHz dynamic range : 110 dB |
7 |
SC-2500A | Sound calibrator | Reference sound pressure(SPL) : 114 dB, 1000 Hz |
Revised:2025/06/17
