• Sound generated from internal electronic printed wiring board or speaker is one of the abnormal sounds from a plasma display. This example shows how to capture and make judgment by the vibration which is transmitted from a frame. It is very important to choose suitable accelerometer depending on the loudness of signal (abnormal sound) and to detect signal (abnormal sound) assuredly through band pass filter.
   
• The VC-3200 can be setup three frequency bands and make Pass/Fail judgment based on rms, peak on each band or power averaging calculated value (same for all bands). Also it has effective functions such as comparator delay time setup function and auto operation function. Comparator delay time setup function removes unwanted signal at the time of starting measurement and automatic operation function can control a timing of judgment by inputting control signal from external device such as PLC*.
   
• Connecting the VC-3200 to a PC via RS-232C interface enables storing measured data and so on.
   
• By connecting a pair of commercially sold headphones to the VC-3200, it is possible to make hearing check of vibrating sound. Moreover, it can be used instead of conventional stethoscopic probe. Output signals are provided for each band, enabling an observation for vibration phenomenon on each frequency band separately.

* PLC: Programmable Logic Controller