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.