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Use of Multimeter
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.
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
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.
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
? .
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.
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.
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.
Measuring AC/DC
? Make sure that the
switch is switched to the
correct side for DC or AC
measurement.
DC AC

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5.1.Multimeter.ppt

  • 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. DC AC