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Digital Multimeter

Digital Multimeter is a necessary tool for testing, diagnosing, and troubleshooting electrical circuits, components, and devices. 

It is equipment that is capable of measuring multiple electrical properties, voltage, current, resistance and is equipped with a voltmeter, ammeter, and ohmmeter.

  • For an analog meter movement, DC voltage is measured with a series connected between the meter movement and the circuit under test. A switch enables greater resistance to be inserted in series with the meter movement to read higher voltages.
  • Analog current ranges match low resistance shunts which are connected in parallel with the meter movement to divert current around the coil. Moving coil instruments can only respond to the average current value, In order to measure alternating current, a rectifier is inserted in the circuit so that each negative half cycle is inverted.
  • In order to measure resistance, switches are arranged for a small battery within the instrument to pass a current through the device under test and meter coil.

Digital Instruments incorporate amplifiers that use the same procedures as an analog instrument for resistance readings. A small constant current is passed through the device under test and the digital multimeter reads the resultant voltage drop.