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©2006 Sunrise Medical
INTRODUCTION
This section describes the basic symbols used in a typical multimeter.
AC
This symbol means alternating current. Use this when you want to test
something that has AC current running through it. Typically you’d want to test
the voltage of an inverter (for cold cathodes or neons) or a similar device.
DC
This means Direct Current. This is the type of electrical power produced by
a battery. With a battery connector, the black wire(s) should be connected to
the negative(-) terminal of the battery and should be considered the common
ground. The red wire(s) should be connected to the po) terminal of the
battery and is considered the “hot” lead.
Voltage
This means Voltage or Potential Difference. This measures the potential
difference between the two probes. To measure voltage, connect the positive
probe to a port that is marked “V” or Voltage.
Note: “mV” means milli-volts .001 Voltage
Current
Technically, this term is incorrect. It should be “I” but since current is
measured in Amps and the readout value is in amps, the symbol makes
sense. This measures the current that is
fl
owing through the part of the circuit
between the two probes (the meter itself). Typically, you need to plug the
positive terminal into a port marked “A” or Current. You need to put the meter
“In Series” in the circuit to use this feature correctly.
Resistance
This symbol means Resistance and is measured in Ohms. You can use this
setting to measure the resistance between two points; for example across a
piece of wire or a resistor (to check its value). If you don’t have a continuity
check, then this can be used to check for shorts. Any value below 0.05 Ohms
constitutes a short, meaning that whatever the probes are attached to is
connected electrically.
Continuity
A commonly used function. Basically, what it does is put a current through
the two terminals (the same as the Ohm-meter function) and if the resulting
value is within the “contact” range, it will beep. This feature found on some
multimeters enables you to check for shorts without taking your eyes off your
work. Other meters may have a light that turns on when a short is found.
Symbols
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