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TM55-1730-228-13&P
e. When checking with a voltmeter, always connect it in parallel with (across) the terminals of the component to be
checked. Where the terminals are easily accessible, the power need not be turned off to make voltage checks. Where
there is a possibility of touching an adjacent terminal or the SPEMS frame when attaching the positive lead clip, the
power should be OFF and the meter lead clipped securely to the terminal to be checked before restoring power.
Never attempt to make resistance checks until all sources of power connected to the circuit or device to be
checked are disconnected. The multimeter will be damaged if this procedure is not followed.
f. When checking with an ohmmeter, always connect it in parallel with (across) the terminals of the component to
be checked. If the component has only a single terminal, connect between the terminal and the frame of the component
or SPEMS.  The component being checked must be removed from the circuit.  Remove all connections to the
component before making any resistance or continuity checks. One terminal of most electrical components is connected
to the SPEMS frame.  However, the component may remain mounted in the SPEMS provided all other circuit
connections have been removed.
Always handle the meter sets carefully.  although they are ruggedly built, the meters are delicate
instruments and can be damaged easily by rough handling. Be sure to stow all leads and adapters in their
proper compartments after the checks have been completed.
In choosing a location for the low voltage circuit checker, on the vehicle or service bench, be sure to place
the meter in a position that will not restrict the air flow through the bottom and top openings. Do not
exceed the duty cycle of 3 minutes ON and 27 minutes OFF.
3-10. SPECIFIC INSTRUCTIONS FOR USE OF THE MULTIMETER
3-10
Paragraphs 3-11 through 3-13 cover specific multimeter checks that can be made.
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3-11

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