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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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Presentation Transcript
understand the quantity to be measured
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)
digital meters
Digital Meters

Quantity is displayed on a fixed number of digits

Indicate polarity by displaying a minus sign

Decimal point moves with range setting

moving vane meters
Moving Vane Meters
  • Can be damaged by the wrong polarity signal
  • Or by exceeding the maximum range
an interactive quiz
An Interactive Quiz

Feel free to give the

answer if you think

you know it!

choose the correct setting
Choose the Correct Setting:

9-volt transistor battery

200milli

2

20

200

400m

4

40

400

600

DC

AC

VOLTS

OHMS

MILLIAMPS

slide11

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.

slide12

Choose the Correct Setting:

12-volt marine battery

200m

2

20

200

400m

4

40

400

600

DC

AC

VOLTS

OHMS

MILLIAMPS

slide13

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!

slide14

Choose the Correct Setting:

DC-to-AC Power Inverter Output

200m

2

20

200

400m

4

40

400

600

DC

AC

VOLTS

OHMS

MILLIAMPS

slide15

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

slide16

Choose the Correct Setting:

AC-to-DC Wall Adapter

200m

2

20

200

400m

4

40

400

600

DC

AC

VOLTS

OHMS

MILLIAMPS

slide17

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

slide18

Choose the Correct Setting:

2.7k ohm resistor

200

2k

20k

200k

400

4k

40k

400k

DC

AC

VOLTS

OHMS

MILLIAMPS

slide19

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.

slide20

Choose the Correct Setting:

5-amp fuse

200

2k

20k

200k

400

4k

40k

400k

DC

AC

VOLTS

OHMS

MILLIAMPS

slide21

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.

slide22

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!

slide23

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.

slide24

Choose the Correct Setting:

1.5-volt watch battery

200m

2

20

200

400m

4

40

400

600

DC

AC

VOLTS

OHMS

MILLIAMPS

slide25

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.

slide26

Choose the Correct Setting:

Current a battery produces

200m

2

20

200

400m

4

40

400

600

DC

AC

VOLTS

OHMS

MILLIAMPS

slide27

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!

safety first
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
thank you
Thank You
  • For your attention