• As an inspection of abnormal sound from compressor, hearing test by operator is popular. You could choose another method using sound level meter etc. because it is an inspection by sound, but it requires enough space and much cost for anechoic box in order to reduce the influence of the back ground noise. As an alternative to these methods, the inspection which is focused on the vibration is performed. Processing the band-limited frequency allows the detection of abnormal sound and automatic determination.
   
• The VC-3200 can be setup three frequency bands and make Pass/Fail judgment based on the 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. 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 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 separately.

* PLC: Programmable Logic Controller