This document provides instructions on how to use a multimeter to take various electrical measurements. It explains that a multimeter has a selection switch to choose between measuring voltage, current, or resistance. It also describes how to properly connect the multimeter for different types of measurements, including using the correct terminals and scales. The document highlights features of both analog and digital multimeters and provides an example of measuring resistance.

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.
DC AC