The tracker is a genera! purpose troubleshooting test instrument. It qualitatively evaluates digital, analog, and hybrid semiconductor devices, as well as capacitive and inductive devices, in or out of circuit, in a power off state. The tracker operates by providing an ac stimulus to the component or circuit under test and displaying the resultant current and voltage levels and their phase relationship. The tracker display indicates any component leakage, shorts, opens, noise, pi us any combination of these problems. Included with each tracker is a set of Huntron Micro Probe test leads. These test leads plug into the front panel test jacks of the tracker and have special tips that allow contact with very small component terminals and printed circuit board traces without the danger of touching adjacent component leads and terminals. Also included with the tracker is a special common test lead that allows the connection of tracker common to two components. This test lead is used in the alternate mode of operation.