The Agilent HP 1415A Time Domain Reflectometer Plug-In in a 140 System Mainframe (sold separately) represents a completely integrated broad-band system for testing cables, transmission lines, strip lines, connectors, and other types of high frequency devices. Easy to operate, you can quickly determine the magnitude and nature of each resistive or reactive discontinuity. System risetime is less than 150 pS, signal channel risetime is 110 pS. Input impedance of 50 ohms.