Multimeters are an extremely useful tool for troubleshooting electrical problems.
They can be purchased in either analog or digital form and have a price range
to suit any budget. A multimeter is a voltmeter, ammeter and ohmmeter (along
with other features) combined into one instrument. It is often used when testing
solid state circuits because of its high input impedance (usually 10 megaohms
or more). A brief description of the multimeter main test functions follows:
- Voltmeter[emdash]the voltmeter is used to measure voltage at any point in
a circuit, or to measure the voltage drop across any part of a circuit. Voltmeters
usually have various scales and a selector switch to allow the reading of
different voltage ranges. The voltmeter has a positive and a negative lead.
To avoid damage to the meter, always connect the negative lead to the negative
(-) side of the circuit (to ground or nearest the ground side of the circuit)
and connect the positive lead to the positive (+) side of the circuit (to
the power source or the nearest power source). Note that the negative voltmeter
lead will always be black and that the positive voltmeter will always be some
color other than black (usually red).
- Ohmmeter[emdash]the ohmmeter is designed to read resistance (measured in
ohms) in a circuit or component. All ohmmeters will have a selector switch
which permits the measurement of different ranges of resistance (usually the
selector switch allows the multiplication of the meter reading by 10, 100,
1,000 and 10,000). Since the meters are powered by an internal battery, the
ohmmeter can be used as a self-powered test light. When the ohmmeter is connected,
current from the ohmmeter flows through the circuit or component being tested.
Since the ohmmeter's internal resistance and voltage are known values, the
amount of current flow through the meter depends on the resistance of the
circuit or component being tested. The ohmmeter can also be used to perform
a continuity test for suspected open circuits. In using the meter for making
continuity checks, do not be concerned with the actual resistance readings.
Zero resistance, or any ohm reading, indicates continuity in the circuit.
Infinite resistance indicates an opening in the circuit. A high resistance
reading where there should be none indicates a problem in the circuit. Checks
for short circuits are made in the same manner as checks for open circuits,
except that the circuit must be isolated from both power and normal ground.
Infinite resistance indicates no continuity to ground, while zero resistance
indicates a dead short to ground.
WARNING
Never use an ohmmeter to check the resistance of a component or wire while there
is voltage applied to the circuit.
Ammeter[emdash]an ammeter measures the amount of current flowing through a
circuit in units called amperes or amps. At normal operating voltage, most circuits
have a characteristic amount of amperes, called "current draw'' which can be
measured using an ammeter. By referring to a specified current draw rating,
then measuring the amperes and comparing the two values, one can determine what
is happening within the circuit to aid in diagnosis. An open circuit, for example,
will not allow any current to flow, so the ammeter reading will be zero. A damaged
component or circuit will have an increased current draw, so the reading will
be high. The ammeter is always connected in series with the circuit being tested.
All of the current that normally flows through the circuit must also flow through
the ammeter; if there is any other path for the current to follow, the ammeter
reading will not be accurate. The ammeter itself has very little resistance
to current flow and, therefore, will not affect the circuit, but it will measure
current draw only when the circuit is closed and electricity is flowing. Excessive
current draw can blow fuses and drain the battery, while a reduced current draw
can cause motors to run slowly, lights to dim and other components to not operate
properly.
