Patent ID: 7768292

Claim:
A power supply tester wherein the improvement comprises: a voltmeter circuit that can sense the voltage across a preexisting conducting element of a power supply under test, said voltage being proportional to the output current of said power supply under test by an operational resistance of unknown value, and generate electrical signals quantifying said voltage, a current injector circuit that can force quantified fluctuations in said output current of said power supply under test, a first means for user input that allows the user of said power supply tester to control the amplitude and waveform of said output current fluctuations, and to define the test to be performed, a second means for user output that makes measurement results available to the user of said power supply tester, and a third means for control that provides memory, computational, and control functions according to a predetermined algorithm that includes collecting data and calculation of output current, said third means being electrically interfaced to said voltmeter circuit, said current injector circuit, said first means, and said second means, whereby said output current of said power supply under test is measured without any prerequisite design constraint on, or alteration of said power supply under test.