An abnormal sound from an actuator for the door mirror might be caused a deformation or missing of the resin gear teeth, grease with foreign material or motor itself. There are several ways to inspect them before delivery such as hearing test by operator or frequency analysis using FFT analyzer. The former has a problem of varying in quality because the test depends on the human sense. On the other hand, the latter is expensive to prepare the system. In this example, the VC-3200 vibration comparator detects the abnormality from vibration by mounting the sensor on the measurement object. The VC-3200 achieves quantitative judgment than sensory test and greatly helps to improve the product in quality. Also the system can be assembled with low cost and helps to lead expansion of production line.
 

The VC-3200 can be setup three kinds of frequency band and make Pass/Fail judgment of each band based on the rms, peak or power averaging calculated value (same for all bands). Also it has comparator delay time setting functions and auto operation function. The comparator delay time setting function removes the unwanted signal at the time of starting measurement and the auto 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 the 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.