The document discusses volt-ohm-milliammeter (VOM) and multi-meters, which are instruments that can measure voltage, resistance, and current. There are two main types - analog and digital. Digital multi-meters display readings digitally, making them easy to read, while analog uses a moving coil meter with a needle. Both types consist of key parts like probes, ports, displays, knobs to select the range and function, and must be properly maintained and used safely.

1. MULTIMETER

2. The volt-ohm-milliammeter
(VOM) is a three-in-one test
instrument.
This is the reason why it is also
called a Multi-meter.

3. The multi-meter is the best
instrument that measure the
numerical value of voltage,
resistance and current in
electronics & electrical
equipment.

4. TWO GENERAL TYPES OF MULTIMETER
ANALOG DIGITAL

5. DIGITAL MULTIMETER
Measured values are
shown on a digital
display, allowing them
to be read easily and
directly, even by first-
time users.

6. ANALOG
MULTIMETER

7. MULTI-METER
Multi-Tester- The volt-ohm-
milliammeter (VOM) is a three-in-
test instrument.
This is the reason why it is also
called a multi-meter.

8. MULTI-METER
The multi-meter is the best
instrument that measure the
numerical value of voltage,
resistance and current.

9. ANALOG MULTIMETER
test instruments
based on the use
of a moving coil
meter

10. ANALOG MULTIMETER
uses the deflection
of an indicator
needle to indicate
the level of the
measurement
being made

11. PARTS OF
MULTIMETER

12. PARTS OF MULTIMETER
METER POINTER
The needle-shape
rod that moves over the
scale of a meter. It is
mechanically connected
to the moving coil. It
indicates the measured
values on the multimeter.

13. PARTS OF MULTIMETER
SCALE
is a series of marking used for
reading the value of quantity.
Scale can have different types
of scale, for voltage and
current readings the scales
have mostly linear which mean
equal division for resistance .

14. PARTS OF MULTIMETER
ZERO-OHM
ADJUSTMENT KNOB
is used to zero-in the
pointer before
measuring
resistance.

15. PARTS OF MULTIMETER
ADJUSTMENT SCREW
makes it possible to
adjust the pointer to
the zero position of
the scale.

16. PARTS OF MULTIMETER
RANGE
positioned in the whole
corners of the range
selector knob. The
voltages in AC and DC,
Resistance or Ohms,
and the ampere ranges
are written here.

17. PARTS OF MULTIMETER
RANGE SELECTOR
KNOB
(selector switch)
makes it possible to
select different
function and range
of the meter.

18. PARTS OF MULTIMETER
TEST PROBE
Positive (red) and
negative (black) is
used to connect the
circuit to the electrical
components being
tested.

19. PARTS OF
MULTIMETER

20. DIGITAL
MULTIMETER

21. Types of digital multimeters
HANDHELD TYPE BENCHTOP TYPE

22. DIGITAL MULTI-METER
HANDHELD models feature a compact design
so that they can be held during use. Since they
are easy to carry, they can be used in a variety
of applications, from laboratories to on-site
work.

23. DIGITAL MULTI-METER
BENCHTOP models are designed to be
placed on a horizontal surface during use.
They are often embedded in workbenches,
systems, and production lines, and many
have a large number of display digits.

24. DISPLAY
SCREEN
PARTS AND FUNCTION OF DIGITAL MULTI-METER

25. DISPLAY SCREEN
•Display screen-It has an
illuminated display screen
for better visualization.
PARTS AND FUNCTION OF DIGITAL MULTI-METER
•It has five digits display screen; one represents
significant value and the other four are for
number representation.

26. RANGE
PARTS AND FUNCTION OF DIGITAL MULTI-METER
•It is positioned in the
whole corners of the
range selector knob.
Written here are the
voltages in AC and DC,
Resistance or Ohms,
and the ampere ranges.

27. RANGE SELECTION KNOB
PARTS AND FUNCTION OF DIGITAL MULTI-METER
• The selection knob
allows the user to
select the different
jobs.

28. CONTROLS/BUTTONS
PARTS AND FUNCTION OF DIGITAL MULTI-METER
•It allows you to select
the quality to be
measured, such as
resistance, current or
voltage.

29. TEST PROBE
A multimeter comes with a
pair of probes (red and black)
for the hot line (or active line)
and ground line (or negative
line).
PARTS AND FUNCTION OF DIGITAL MULTI-METER

30. PORT
The input jack where we
insert the probes.
PARTS AND FUNCTION OF DIGITAL MULTI-METER

31. PROPER CARE
AND
MAINTENANCE
OF THE
MULTIMETER

32. 1.Read manual of instruction on how to
operate the multimeter.
2.In reading the amount of voltage, always
start with the highest range to avoid
reading voltage higher than the tester is
set to the tester setting.
PROPER CARE AND MAINTENANCE OF THE
MULTIMETER

33. 3. Be sure that the tester is set to the
correct range setting: resistance range
when measuring the ohm, voltage range
when measuring voltage and ammeter
range when measuring the value of
electric current.
PROPER CARE AND MAINTENANCE OF THE
MULTIMETER

34. 4. Always check the condition of its
battery. Worn out batteries will damage
the internal setting of the tester.
5. When the tester is not in used or will be
stored, set the selector switch to 1000V
or to OFF position.
6. Never drop the tester.
PROPER CARE AND MAINTENANCE OF THE
MULTIMETER

35. SAFETY PRECAUTION ON USING
MULTIMETER
• Person who do not have enough knowledge
about electric measurements must not use
this instrument.
• Do not measure the electricity when
barefooted to protect yourself from
electrical shock hazard.

36. SAFETY PRECAUTION ON USING
MULTIMETER
• Be careful not to get hurt with the sharp
test lead pins.
• Away instrument in from hot and humid
conditions
• Do not attempt to clean the instruments
with any cleaning fluids like gasoline or
benzine