2 - 1
Section C
Electrics
9803/8500
Section C
2 - 1
Issue 1
Test Methods
How to Use a Multimeter
These instructions are intended to cover the use of the recommended AVO 2003 and a moving pointer (analogue) meter.
1 Make sure that the test leads are plugged into the correct sockets. The black probe should be plugged into the black socket
(sometimes, this socket is also marked by a "-", or "E" or marked as "COMMON" or "COM"). The red probe should be
plugged into the red socket marked with "+", "V" or "û".
2 Ensure that the test probes have a good clean contact with bare metal, free from grease, dirt, and corrosion, as these can
cause a false reading.
3 When measuring voltage:
Make sure that the correct range is selected, that is set the selector to a value equal to or greater than that you are about to
measure.
e.g. If asked to measure 12 Volts, set the selector to the 12 V range. If there is no 12 V range, set the selector to the next
range higher, 20 V for instance.
If the meter is set to a range that is too low, it may be damaged.
e.g. setting to the 2 V range to measure 12 V.
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