• To evaluate tolerance of material against torsion, torsional tester is used. This example shows how to detect cracks on material by vibration. The vibration sensor is mounted (magnetic attachable/removal) on around a bearing of chuck (stationary side). The VC-3200 can make judgment (simultaneous determination of three bands) by capturing up to three abnormal phenomena. The difference of frequency band between vibration in rotor rotation and vibration from cracked material can be used for monitoring of vibration by using the band changeable processing function of the VC-3200.
   
• The VC-3200 can be setup three frequency bands and make Pass/Fail judgment based on the rms, peak or power averaging calculated value (same for all bands) on each band. Also it has effective functions such as comparator delay time setup function and auto operation function. The comparator delay time setup function removes unwanted signal at the time of starting measurement and the automatic operation function can control the timing of judgment by inputting a control signal from external device such as PLC*. Although the VC-3200 can be operated by 24VDC (22 to 26VDC) as standard, you have an alternative to use it at 100 VAC by connecting the optional AC/DC convertor VC-0352.
   
• Connecting the VC-3200 to a PC via RS-232C interface enables storing the 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.

* PLC: Programmable Logic Controller