• An endurance test of bearing is performed by rotating it over long time under being loaded. To check damage situation, you have to remove bearing for visual checking of nicks on it after more than one hour operation or judge by sound or vibration during operation. Since most of tests are performed in unattended operation, abnormality of bearing might not be realized and it can damage the tester. In this example, the VC-3200 vibration comparator detects abnormal vibration by mounting sensor (screw mounting) on measurement object. The VC-3200 can make judgment (simultaneous judgment of three bands) by capturing up to maximum of three abnormal phenomena. The VC-3200 constantly monitors bearing vibration and outputs Failure signal if unusual vibration is occurred, so it enables machinery control such as an emergency stop. Also you can accurately figure out occurrence of nick by using the crest factor count function of VC-3200 (option).
   
• The VC-3200 can be setup three kinds of frequency bands and make Pass/Fail judgment of each band based on rms, peak, or power averaging calculated value (same for all bands). Also it has the comparator delay time setting function and auto operation function. The comparator delay time setting function removes unwanted signal at the time of starting measurement and the auto operation function can control a timing of judgment by inputting control signal from external device such as PLC^*. Although the VC-3200 can be operated by 24 VDC (22 to 26 VDC) 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 signal is provided for each band, enabling an observation for vibration phenomenon on each frequency band.

* PLC: Programmable Logic Controller