| 摘要 |
A signal source in the form of a 60 Hertz voltage generator provides a 12 volt peak-to-peak signal to the primary winding of a transformer having a secondary winding which has an upper lead, a lower lead, a return lead which is between the upper and lower leads, and a tap lead between the lower lead and the return lead. The lower lead is connected through a variable resistance to the return lead. The movable arm of the variable resistance is connected to a first amplifier circuit, the output of which is applied to one of the horizontal deflection plates of an oscilloscope. The upper lead is connected through a 5 ohm resistor to ground and also to the input of a second amplifier circuit, the output of which is applied to one of the vertical deflection plates of the oscilloscope. The tap lead is connected to a first test lead, and the other test lead is connected to ground. The two test leads are moved by an operator along the circuit being tested to locate electrical shorts in the circuit and/or the elements comprising the circuit.
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