When a hydraulic pump for the automotive power steering is driven by a drive motor to generate hydraulic pressure, pulse pressure vibration occurs. The vibration detected by the NP-3418 accelerometer with built-in preamplifier and the rotation pulse of the drive motor detected by a rotation detector are sent to the CF-4500 FFT comparator. The peak hold function of the CF-4500 detects amplitude of the first to the n-th order component of rotation for pulse pressure vibration. ON/NG judgment power steering pump is made depending on the peak level.

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. Five kinds of judgment methods (level, peak level, peak max, section overall, areal 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.