The Model 253771 motor input module is for use with the PZ4000 power analyzer. The module can measure the output of a torque and speed sensor, then compute mechanical power, synchronous speed, slip, motor efficiency, and total efficiency. The PZ4000 can show torque and rotating speed as waveforms on the display. Using the MATH function, the trend curve of mechanical power, efficiency, and V/Hz can be displayed. Using the X-Y-Z display of the PZ4000, the torque vs. rotating speed curve can be viewed.