Automatic range finder for electric current testing
AssigneeQualiTau, Inc.
InventorsGedaliahoo Krieger, Peter P. Cuevas, James Borthwick
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Abstract
In an electrical circuit for testing electrical current using a plurality of precision resistors connected in parallel or in series, a range finder for receiving the current to be measured with the voltage drop across the range finder being indicative of a current sub-range for measurement. In a preferred embodiment, a range finder has a first bipolar transistor and a second bipolar transistor connected in parallel and in opposite polarity with the emitter and base of each transistor connected together whereby each transistor functions as an emitter-base diode.
Claims9
A current measurement circuit comprising:
- a) a resistor network including a plurality of resistors selectively connectable for receiving a range of current to be measured, a voltage drop across a resistor being indicative of current, each resistor correesponding to a sub-range of current to be measured,
- b) a range finder selectively connectable for receiving the current to be measured, the voltage drop across the range finder being indicative of a sub-range of current, and
- c) a switch control circuit responsive to voltage drop across the range finder and controlling the connection of the plurality of resistors for receiving the sub-range of current to be measured.
Dependencies are inferred from the claim text.