As an abnormal sound when you turn a steering wheel, the noise from steering pump or the vibration of parts friction is one of the possible causes. For an inspection before delivery, the operator actually turns the steering wheel and makes judgment to hear the generated sound by attaching the jig to the pump. This example shows how to detect the abnormal sound from vibration with the VC-3200 vibration comparator by mounting the sensor on the measurement object. The VC-3200 enables the detection of vibration which you want by band pass filter and quantitative judgment by level judgment. It greatly helps to ensure the stable products in quality. Because of the structure of pump, there is some timing when the abnormal sound is generated. The VC-3200 has a function to control the timing in order to measure the abnormal sound by using gate signal.
 

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.