The document discusses a multitester, which is an instrument that can measure voltage, current, and resistance. It explains that multitesters come in analog and digital forms. It then provides analogies to explain voltage, current, and resistance using a water tank system. The document also describes the key parts of a multitester and provides tips for proper care and maintenance.

2. MULTITESTER
 -It is the best instrument that can measure voltage,
resistance and current. It is generally made of two
types: the analog and the digital

3. What is voltage? An analogy would be a huge
water tank filled with thousands of gallons of water
high on a hill.
The difference between the pressure of water in the
tank and the water that comes out of a pipe connected
at the bottom leading to a faucet is determined by the
size of the pipe and the size of the outlet of the faucet.
This difference of pressure between the two can be
thought of as potential Voltage.
What is current? An analogy would be the amount of
flow determined by the pressure (voltage) of the water
thru the pipes leading to a faucet. The term current
refers to the quantity, volume or intensity of electrical
flow, as opposed to voltage, which refers to the force or
"pressure" causing the current flow.

4. What is resistance? An analogy would be the size of the
water pipes and the size of the faucet. The larger the pipe and
the faucet (less resistance), the more water that comes out!
The smaller the pipe and faucet, (more resistance), the less
water that comes out! This can be thought of as resistance to
the flow of the water current.
All three of these: voltage, current and resistance directly
interact in Ohm's law.
Change any two of them and you effect the third.

5. DIGITAL
MULTITESTER
A piece of test equipme
nt used for measuring v
oltage, current, resistan
ce, and possibly other
electrical quantities an
d displaying the value i
n number form.

6. ANALOG
MULTITESTER
although older than the
commonly preferred
digital multimeter, do
come with several
unique advantages.
Although both digital
and analog multimeters
measure varying units,
such as voltage, current,
and resistance, they
display their readings in
distinctly different
ways.

7. PARTS OF MULTITESTER
1. 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.
2 RANGE SELECTOR KNOB-(selector switch) makes it
possible to select different function and range of the
meter.
3. ADJUSTMENT SCREW- makes it possible to adjust the
pointer to the zero position of the scale.

8. 4. 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 .
5. TEST PROBE- Positive (red) negative (black) is use to
connect the circuit to the electrical components being
tested.
6. ZERO-OHM ADJUSTMENT KNOB- is used to zero-in
the pointer before measuring resistance.

9. PROPER CARE AND MAINTENANCE OF
THE MULTITESTER
1. Read manual of instruction on how to operate the multitester.
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.
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.
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.
5. Never drop the tester.