Multimeter Tutorial; The Multimeter; The Probes; The Ports - Quickie QM-7 Series Service Manual

Multimeter Tutorial

The Multimeter

For Powerchairs, the multimeter is one of the
most useful tools in the toolbox (fi gure .3.1). It
can be used to check wires, shorts, voltages,
resistance, and all manner of electrical circuits.
This tutorial is designed to help clarify the sym-
bols and socket options. This Section is meant to
be a General tutorial and may not apply to all of
the specifi c options on the meter in use. Please
consult your user's manual, to avoid errant read-
ings.

The Probes

Probes are found on various multimeters (fi gure
3.2). The Probes connect the meter to the circuit.
Simply touch them to the directed area with the
Mulitmeter on the correct settings, and read the
display. Carefully follow instructions for place-
ment of the probes to avoid errant reads.

The Ports

1. The Common Port. (fi gure .3.3)
Generally, the black probe plugs in here
(negative) and as the name suggests, it's the
common element to all of the testing circuits.
Think of it as the ground rail.
2. Voltage, Resistance and Continuity port.
This is a commonly used option. Connect
the red (positive) probe to this port when
fi nding voltage readings, resistance readings
or when checking wire continuity. This is ex-
plained in more detail later in the tutorial.
3. Current up to 400mA.
This port is used for "counting electrons" in
a circuit, and thus their rate of fl ow (current
being the fl ow of electrons). You'll notice that
this side is "fused", so that you don't end up
melting the meter's circuits.
4. Current up to 10A.
Same as above, except it can take more cur-
rent, as the name suggests.
SUNRISE MEDICAL
Section 1
QM-7 SERIES SERVICE MANUAL
Fig .3.1
JANUARY 2012
PAGE 1.1
Fig. 3.2
Fig. 3.3