A measuring apparatus includes a first waveguide device with a first feed in device. The apparatus may include a statistics engine coupled to a memory. The linear movement member is provided with a reference index at a predetermined circumferential position thereof, so that the position of use of the cam groove can be visually confirmed by viewing the position of the step area indicating indexes relative to the reference index. In order to do so, the testing interface includes components configured for generating addresses, commands, and test data to be conveyed to the integrated circuit. Over-driving efficiency is improved by controlling the discharging time and the drivability using different sized the drivers when the power supply voltage fluctuates while the bit line over-driving operation is performed.