The SWC-10 is used to calibrate the display sensitivity of the SWA-100 synchro wave analyzer of the display unit. Calibrations are performed using a rotation synchronization pulse from the drive unit and signal output from the SWC-10, which is equivalent to the signal from the velocity sensor. When used with another signal generator, the SWC-10 is also used to test the operations of the synchro wave analyzer for rotation speed and number of crests.