Page 25 - Testing Electronic Components

Inserting a meter in series, however, is not always an easy task. In many
cases you must physically interrupt a circuit at the point you wish to
measure, and then connect test leads across the break. Although it may be
easy to interrupt a circuit, keep in mind that you must also put the circuit
back together.

Set your multimeter to the desired function (DCA or ACA) and select the
appropriate range. If you are unsure about proper range, set the meter to
its largest range. Make sure that the meter can handle the amount of
current you are expecting.
Turn off all power to a circuit before inserting a current meter as shown
in Fig below. Insert the meter and reapply power. Read Current directly
from the panel meter.

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