Use of Multimeter

1
Use of Multimeter
2
Outlook of Multimeter

• Pointer and Scale
• single pointer with different scale for different
  measurements

• Selection Switch
• select to measure voltage (ac or dc), current or
  resistance.

3
Reading from Multimeter

• As the Selection Switch is at DC25mA, the
  multimeter is used as a ammeter with fsd 25mA.
• The 250A scale is used.
• Reading 17.5mA

4
Using as an Ohmmeter

• With the input terminals shorted, set zero by
  turning the 0? Adjust Knob.
• Remember to set zero again if the ohmmeter range
  is changed.

5
Reading from Multimeter

• As the Selection Switch is at x10, the reading
  has to be multiplied by 10.
• The reading is 90, so the resistance is 900 ? .

6
Measuring AC Voltage

• If AC voltage is measured, remember to use the
  output terminal instead of the positive
  terminal.
• The negative terminal is still used.

7
Digital Multimeter

• Same as analogue multimeter but it has the
  advantage of having a large internal resistance.
• If the reading is larger than the range, the
  reading cannot be shown.
• The COM terminal is always used. The other
  terminal can be 10A, ?AmA, V? depending on
  the measurement.

8
Digital Ohmmeter

• In the figure shown, the resistance of the
  resistor is 0.824k?.

• There is no need to multiplied 2k for digital
  ohmmeter as it is the range, but not the
  conversion factor.

9
Measuring AC/DC

• Make sure that the switch is switched to the
  correct side for DC or AC measurement.

AC
DC