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Using a Multimeter (or you, too, can have fun with electricity)

Using a Multimeter (or you, too, can have fun with electricity). Volts Ohms milliamps. Understand the Quantity to be Measured. Is it voltage, current or resistance? Is it direct current or alternating current? What is the maximum expected value? Select the appropriate measurement range

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Using a Multimeter (or you, too, can have fun with electricity)

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  1. Using a Multimeter(or you, too, can have fun with electricity) Volts Ohms milliamps

  2. Understand the Quantity to be Measured • Is it voltage, current or resistance? • Is it direct current or alternating current? • What is the maximum expected value? • Select the appropriate measurement range • USE CAUTION WITH HIGH VOLTAGE (more than 30 volts or milliamps may be hazardous)

  3. Voltage is measured across the source (in parallel)

  4. Alternating Current has no polarity

  5. Current (ac or dc) is measured through the load (in series)

  6. Resistance is measured across a passive circuit element

  7. Digital Meters Quantity is displayed on a fixed number of digits Indicate polarity by displaying a minus sign Decimal point moves with range setting

  8. Moving Vane Meters • Can be damaged by the wrong polarity signal • Or by exceeding the maximum range

  9. An Interactive Quiz Feel free to give the answer if you think you know it!

  10. Choose the Correct Setting: 9-volt transistor battery 200milli 2 20 200 400m 4 40 400 600 DC AC VOLTS OHMS MILLIAMPS

  11. Choose the Correct Setting: 9-volt transistor battery • 200m • 2 • 20 • 200 • 400m • 4 • 40 • 400 • 600 • DC • AC • VOLTS • OHMS • MILLIAMPS This alkaline battery is 9 volts new, and drops with age.

  12. Choose the Correct Setting: 12-volt marine battery 200m 2 20 200 400m 4 40 400 600 DC AC VOLTS OHMS MILLIAMPS

  13. Choose the Correct Setting: 12-volt marine battery • 200m • 2 • 20 • 200 • 400m • 4 • 40 • 400 • 600 • DC • AC • VOLTS • OHMS • MILLIAMPS Rechargeable batteries can be higher than their rated voltage!

  14. Choose the Correct Setting: DC-to-AC Power Inverter Output 200m 2 20 200 400m 4 40 400 600 DC AC VOLTS OHMS MILLIAMPS

  15. Choose the Correct Setting: DC-to-AC Power Inverter Output • 200m • 2 • 20 • 200 • 400m • 4 • 40 • 400 • 600 • DC • AC • VOLTS • OHMS • MILLIAMPS For safety, start with the highest range

  16. Choose the Correct Setting: AC-to-DC Wall Adapter 200m 2 20 200 400m 4 40 400 600 DC AC VOLTS OHMS MILLIAMPS

  17. Choose the Correct Setting: AC-to-DC Wall Adapter 200m 2 20 200 400m 4 40 400 600 • DC • AC • VOLTS • OHMS • MILLIAMPS Pick the best range according to the label

  18. Choose the Correct Setting: 2.7k ohm resistor 200 2k 20k 200k 400 4k 40k 400k DC AC VOLTS OHMS MILLIAMPS

  19. Choose the Correct Setting: 2.7k ohm resistor • 200 • 2k • 20k • 200k • 400 • 4k • 40k • 400k • DC • AC • VOLTS • OHMS • MILLIAMPS Reading the color code will tell you the expected value.

  20. Choose the Correct Setting: 5-amp fuse 200 2k 20k 200k 400 4k 40k 400k DC AC VOLTS OHMS MILLIAMPS

  21. Choose the Correct Setting: 5-amp fuse • 200 • 2k • 20k • 200k • 400 • 4k • 40k • 400k • DC • AC • VOLTS • OHMS • MILLIAMPS A fuse should either be ~0 ohms, or infinity if blown, so choose the lowest resistance scale.

  22. Choose the Correct Setting: 240-volt range outlet 200m 2 20 200 400m 4 40 400 600 DC AC VOLTS OHMS MILLIAMPS Don’t touch the metal probe tips with this measurement!

  23. Choose the Correct Setting: 240-volt range outlet • 200m • 2 • 20 • 200 • 400m • 4 • 40 • 400 • 600 • DC • AC • VOLTS • OHMS • MILLIAMPS Start with the highest range for line voltage circuits.

  24. Choose the Correct Setting: 1.5-volt watch battery 200m 2 20 200 400m 4 40 400 600 DC AC VOLTS OHMS MILLIAMPS

  25. Choose the Correct Setting: 1.5-volt watch battery • 200m • 2 • 20 • 200 • 400m • 4 • 40 • 400 • 600 • DC • AC • VOLTS • OHMS • MILLIAMPS The lowest usable range will give the highest accuracy.

  26. Choose the Correct Setting: Current a battery produces 200m 2 20 200 400m 4 40 400 600 DC AC VOLTS OHMS MILLIAMPS

  27. Choose the Correct Setting: Current a battery produces • 200m • 2 • 20 • 200 • 400m • 4 • 40 • 400 • 600 • DC • AC • VOLTS • OHMS • MILLIAMPS Wrong! This will blow the meter fuse and/or damage the meter!

  28. Safety First • Use caution when measuring dangerous voltages • Understand the measurement you are making before using the meter • Test the meter itself on a known value • Make sure the meter is functioning correctly, has been calibrated, and has a good battery

  29. Thank You • For your attention

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