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Introduction to the Digital
Multimeter
The most useful tool in electronics
Introduction to the Digital
Multimeter
Electronic devices function
because of the movement of
invisible electrons
The digital multimeter doesn’t
make electrons visible, but it
does tell use what they are doing
The DDM
The DMM Screen
The DMM Function Dial
The Function Dial
Test Leads
What the Basic DMM Measures
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Continuity
Voltage
Resistance
Current
What is Continuity?
Continuity is a complete current path in a circuit.
If there is continuity, electrons can move from
the negative terminal of the battery, through
the circuit, and back to the positive terminal of
the battery.
Continuity Test
What is Voltage?
Voltage acts like an electrical version of
pressure. Voltage pushes electrons through a
closed circuit (one with continuity).
If there is voltage, the electrons flow from the
negative terminal of the battery (like charges
repel), though a conducting path, to the
positive terminal of the battery (opposite
charges attract).
Voltage Test
What is Resistance?
Resistance acts like a brake on the movement of
electrons. While voltage tries to make a greater
number of electrons more move through a closed
circuit, resistance tries to keep fewer electrons
moving through the circuit.
If there is the proper amount of resistance in a circuit,
electronic components are protected from damage
caused by too many electrons flowing through them.
Resistance Test
What is Current?
Current is the flow of electrons through a closed
circuit. Current is work in a circuit, because
electrons are being moved from one place to
another.
If there is current in a circuit, then voltage is
pushing electrons and resistance is trying to
limit them.
Current Test