Transcript Use of Multimeter

Use of Multimeter
The Mission Covenant Church Holm Glad College
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.
The Mission Covenant Church Holm Glad College
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
The Mission Covenant Church Holm Glad College
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.

The Mission Covenant Church Holm Glad College
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
.
The Mission Covenant Church Holm Glad College
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.

The Mission Covenant Church Holm Glad College
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.
The Mission Covenant Church Holm Glad College
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.
The Mission Covenant Church Holm Glad College
Measuring AC/DC

Make sure that the
switch is switched to the
correct side for DC or AC
measurement.
DC
The Mission Covenant Church Holm Glad College
AC