The NP-3418 accelerometer with built-in preamplifier detects vibration of the bearing inside the rotating ABS motor and sends a signal. The CF-4700 FFT comparator receives the signal and performs FFT frequency analysis. If the bearing has a defect such as abrasion, the harmonic component increases. The CF-4700 makes OK/NG judgment of the ABS motor depending on the partial overall value on the power spectrum of the harmonic component. Also OK/NG judgment can be performed depending on the first to third -order component of rotation on the power spectrum detected by the peak hold function while varying the rotating speed.

The block comparator function makes OK/NG judgment by the block area (maximum setup: 20 blocks) set in a certain frequency range and level range. Six kinds of judgment methods (level, peak level, peak max, insideMax, partial overall or area rate of content) are available for each block. Also the digital I/O function enables control via PLC using comparator output.

The measurement results can be stored into a PC via LAN or RS-232C interface.