How to measure the frequency characteristics of a compact speaker simply and quickly in a mobile phone etc.
Example ４：Further analysis -
Pass/fail judgment on a production line
(using LA-7500, a transmitter, CF-4700, and a PLC)
Output the sine sweep signal from a signal transmitter, and then measure the sound from the speaker with the LA-7500 (Sound level meter). By input the AC output signal from the LA-7500 into the CF-4700 (FFT Comparator), you can display the X axis as frequency, Y axis as sound pressure level.
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.
The Pass/fail judgment is made according to the level of Y-axis. You can control a judgment result, measurement start/stop signal by a PLC.
The combination of the MI series (microphone) + MI-3111 (preamplifier) and SC-2500 (Sound calibrator) are also available instead of the LA-7500 series.
System configuration
| Model name | Product name | Remarks | |
|---|---|---|---|
1 |
LA-7500 | Class 1 Sound Level Meter | Measurement frequency range : 10 Hz to 20.0 kHz |
3 |
AG-3401 | Microphone extension cable | 5m |
4 |
CF-4700 | FFT Comparator | 1ch,1 Hz to 40 kHz, dynamic range: 110 dB or more |
Revised:2018/10/31
