The 1503C MTDR generates high-energy, 1/2-sine shaped pulses for testing long cable runs. The 1503C has 2, 10, 100 and 1000 nanosecond pulse widths. Use of the 2 ns pulse width permits determination of multiple faults as close together as one foot. Cable impedance of 50, 75, 93, and 125 ohms are selectable at the front panel. The 1503C is input protected to 400 volts. The 1503C has a range of up to 50,000 feet.