How to measure the frequency characteristics of a compact speaker simply and quickly in a mobile phone etc.
Example2 : Real-time measurement (using a transmitter, LA-7500, CF-9200, amplifier and a PC)
In the following example, CF-9200 series and a transmitter are used.
The sine sweep signal from the transmitter is input to the speaker.
Analyzing the AC out signal of the sound level meter with the Peak average function of the Power spectrum, you can display the X axis as frequency, Y axis as sound pressure level. Frequency response function can be measured by inputting the sine sweep signal from the signal transmitter to ch1 of the CF-9200 and inputting the signal from the sound level meter to ch2.
System configuration
| Model name | Product name | Remarks | |
|---|---|---|---|
1 |
LA-7500 | Class 1 Sound Level Meter | Measurement frequency range : 10 Hz to 20.0 kHz |
2 |
AG-3401 | Microphone extension cable | 5m |
3 |
CF-9200 | Portable 2ch FFT Analyzer | 2ch, 100 kHz |
Revised:2018/10/31
