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The ohms function of a digital multimeter works by

  • A.comparing the resistance with the input impedance of the instrument
  • B.passing a known current and measuring the voltage across the resistor
  • C.balancing the unknown against an internal standard in a bridge network
  • D.timing the discharge of an internal capacitor through the resistor

Answer: B

A current source of known value drives the unknown and the resulting voltage drop is converted in the usual way, so the display can read directly in ohms. On the lowest ranges a four-terminal connection is offered to remove the lead resistance.

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