| http://www.w3.org/ns/prov#value | - For one embodiment of the invention, the modifying of the test voltage is performed by a circuit which includes an A/D converter for converting the sensed current to a digital value, a digital processor for generating a test voltage modifying value in response to the sensed current, a D/A converter for generating a test voltage modifying voltage, which voltage is applied to modify the test voltage
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