Electricity & Electronic Workbooks

(Martin Jones) #1

DC Fundamentals Unit 13 – Direct Current Meters


Exercise 3 – The DC Voltmeter ................................................................................................


EXERCISE OBJECTIVE


When you have completed this exercise, you will be able to measure volts by using a basic meter
movement. You will verify voltmeter operation by measuring known values of voltage.


EXERCISE DISCUSSION



  • Voltmeters are usually designed to measure multiple ranges of voltage.

  • The 1 mA meter movement used in the circuit has an internal resistance of 100 ohms (RM).

  • In the circuit used for this exercise, resistors R1 and R2 serve as meter multipliers and
    determine the full-scale voltage capability of the meter.

  • The sensitivity of a voltmeter is specified in ohms-per-volt. In this circuit, sensitivity equals
    1000 ohms-per-volt.


NOTES


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