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Using a digital multimeter
(DMM)
A brief guide
As a voltmeter (large voltages)
• Switch to V = 20, this
is the maximum DC
voltage it will read
• The red lead goes in
the...
As an ammeter (large currents)
• Switch to 10A, this is the
maximum current that will
be read (wemay have to
change this l...
As an ammeter (smaller currents)
• Switch to 20mA, this is
the maximum current that
will be read. If it says 2 its
2 mA
• ...
Measuring voltage
• Voltage is the potential
different between two
point in a circuit (how
much energy is carried by
each ...
Measuring voltage
• If you want to
measure the voltage
across resistor 2 you
have to connect the
voltmeter like this
• Don...
Measuring current
• Current is the flow of
charge around a
circuit, the faster the
flow the higher the
current
• Current i...
Measuring current
• Current is measure in
amps and the
ammeter has the A
symbol in a circle
• Don’t worry if you get
a –ve...
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Using a digital multimeter (dmm)

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how to use a multimeter

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Transcript of "Using a digital multimeter (dmm)"

  1. 1. Using a digital multimeter (DMM) A brief guide
  2. 2. As a voltmeter (large voltages) • Switch to V = 20, this is the maximum DC voltage it will read • The red lead goes in the V socket • The black lead always goes in the COM socket • Now you are ready to measure voltage!
  3. 3. As an ammeter (large currents) • Switch to 10A, this is the maximum current that will be read (wemay have to change this later) • The red lead goes in the 10ADC socket • The black lead always goes in the COM socket • Now you are ready to measure current!
  4. 4. As an ammeter (smaller currents) • Switch to 20mA, this is the maximum current that will be read. If it says 2 its 2 mA • The red lead goes in the mA socket • The black lead always goes in the COM socket • Now you are ready to measure smaller currents!
  5. 5. Measuring voltage • Voltage is the potential different between two point in a circuit (how much energy is carried by each charge) • Each charge gives up energy as it travels through a resistor • So voltage must be measured before and after a component
  6. 6. Measuring voltage • If you want to measure the voltage across resistor 2 you have to connect the voltmeter like this • Don’t worry if you geta –ve number, its just connected the wrong way round
  7. 7. Measuring current • Current is the flow of charge around a circuit, the faster the flow the higher the current • Current is the same all around a series circuit so place the current anywhere within the circuit to measure the current
  8. 8. Measuring current • Current is measure in amps and the ammeter has the A symbol in a circle • Don’t worry if you get a –ve number, you have connected it the wrong way round. • It doesn’t make any different to the number
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