FFT Applications
FFT OK/NG judgment, quality control (using PC or PLC* etc.)
Q-1-2 OK/NG judgment of the generated noise from power supply board on a production line
- Prepare a sound insulating box to avoid the influence of the background noise. In the sound insulating box, the sound coming from the power supply board is measured by the MI-1235 Microphone and the MI-3111 Microphone preamplifier, and then input to the CF-4700A FFT Comparator. It can make OK/NG judgment with areal rate of content in power spectrum by setting up of a judgment block around the power frequency caused the noise.
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The block comparator function makes OK/NG judgment by the block area (maximum setup: 20 blocks) set in a certain frequency range and level range. Six kinds of judgment methods (level, peak level, peak max, insideMax, partial overall or area rate of content) are available for each block. Also the digital I/O function enables control via PLC using comparator output.
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The measurement results can be stored into a PC via LAN or RS-232C interface.
Product list
| Model | Product name | Remarks | Qty | |
|---|---|---|---|---|
| 1 | CF-4700A | FFT Comparator | 1 | |
| 2 | MI-1235 | 1/2-inch Microphone/ Preamplifier | 1 | |
| 3 | MI-3111 | Premplaifier for the above microphone | 1 | |
| 4 | SC-2500A | Sound Calibrator | 1 |