Lesson 3/Learning Event 3
You can check continuity with this meter just as you did with the separate ohmmeter. Use the
proper position and zero the meter before you connect it to the circuit. Like the ohmmeter, if the
hand moves to zero when the leads are connected to a wire or component, there is continuity. If
the hand does not move from infinity, there is no continuity--there is an open circuit or excessive
resistance. If the hand stops between the infinity mark and zero, there is a readable resistance in
the circuit. This resistance might be normal if there is a load-type component in the circuit. If
there is no load component in the circuit, there could be a bad connection somewhere.
The continuity test will generally show this type of defect. If the continuity test on a circuit with a
switch indicates resistance, the switch contacts could be dirty. This is one example of a
malfunction causing resistance in a circuit. As you use the multimeter to check continuity you will
learn how it will help you in locating loose connections, broken wires, dirty contacts, and other
malfunctions.
When you finish using an ohmmeter, turn the range selector to any position other than a resistance
position. This will prevent discharging the meter battery in case the test leads accidentally touch
each other.
You can also use the multimeter to measure DC voltage. As you can see, the multimeter can be a
valuable test instrument for the wheeled vehicle repairer. You can use it to locate shorts, broken
circuits, and measure DC voltage as well as other tests. Remember, when you use the multimeter as
an ohmmeter, make sure the circuit to be tested has no voltage in it. Turn the voltage OFF.
Otherwise, the meter can be damaged beyond repair.
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