Upload
joseph-malone
View
224
Download
4
Tags:
Embed Size (px)
Citation preview
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
• 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