Multitester

Question 1

• also known as multimeter or VOM (Volt-Ohm-Milliammeter), is an electronic measuring instrument used to measure various electrical parameters.
• a standard diagnostic tool for technicians and electricians in the electrical & electronic industries
• can be handheld or bench-top

Answer 1

Multitesters

Question 2

A typical multimeter can measure what?

Answer 2

• voltage, current, and resistance.
• continuity, frequency and capacitance. They also come with built-in non-contact voltage detectors (only the best ones)

Question 3

Multimeters can be classified into two, what are those

Answer 3

digital multimeters or analog multimeters

Question 4

Reading a multimeter: Plug-in probes

Answer 4

Ports

Question 5

Reading a multimeter: This is where you can see the measurements

Answer 5

Display

Question 6

Reading a multimeter: Multimeters have two of these. Usually one is black and one is red.

Answer 6

Probes

Question 7

Reading a multimeter: This tells you what you want to
measure.

Answer 7

Selection knob

Question 8

How to read and measure the ohms resistance using a
multimeter

Answer 8

1. Clip the test leads on the resistor leads
2. Dial the multimeter to the estimated resistance
   range
3. Read the value

Question 9

If your multimeter gives you a 1, then you’ve
guessed low for a value, what should you do?

Answer 9

Move the multimeter’s dial
upward until it gives you a valid reading.

Question 10

If your multimeter gives you a 0, what should you do?

Answer 10

Move the dial downward until you get a
valid reading.

Question 11

If you’re on the lowest range and still have a 0,
whatever circuit you’re testing has a what?

Answer 11

Resistance too low

Question 12

Multimeter symbols: Placed on the top left corner on most multimeters, this button locks the measurement into place after you’ve taken it.

Answer 12

Hold

Question 13

Multimeter symbols: It tells you the equipment’s or circuit’s frequency. This is usually placed above the AC voltage option

Answer 13

Shift: Hertz

Question 14

Multimeter symbols: An upper case Omega letter. This is used to find the resistance reading.

Answer 14

Ohms

Question 15

Multimeter symbols: This has a right arrow with a plus sign next to it.
As you could have guessed, this tells you if you’re working with good or bad diodes

Answer 15

Diode Test

Question 16

Multimeter symbols: Has a V and three hyphens above it and
one straight line above it.

Answer 16

DC Voltage

Question 17

Multimeter symbols: Looks like an A with “a road” placed on top of it. It has an A with three dashes and a straight line above it.

Answer 17

AC Voltage

Question 18

Parts of the multitester: This is how you read the value being measured.

Answer 18

Scale

Question 19

Parts of the multitester: needle-shaped rod that moves over the
scale of a meter.

Answer 19

Needle Pointer

Question 20

Parts of the multitester:
- Also known as the dial or infinity knob. This allows you to adjust the pointer to the zero position of the scale – usually with the help of a flat head screwdriver
- the name ‘infinity knob’ comes from the fact that at 0 voltage, you have ‘infinite resistance’

Answer 20

Adjustment Screw

Question 21

Parts of the multitester: is used to calibrate the multitester when you want to measure the resistance of an object.

Answer 21

Zero-Ohm Adjustment Knob

Question 22

How to calibrate a multitester?

Answer 22

1. Turn on the multitester
2. Connect the metal tips of the two probes
3. Use the zero-ohm adjustment knob to adjust the
   needle to point to ‘0 ohms’ on the scale

Question 23

When the metal tips make contact, we want Ohms to be what value?

Answer 23

= 0

Question 24

Parts of the multitester: Also known as a selector switch. This allows you
to adjust the settings of the multitester

Answer 24

Range Selector Knob

Question 25

Parts of the multitester: The holes at the front of the multitester are
known as ____?

Answer 25

Ports

Question 26

Parts of the multitester: is an instrument used to connect a
multitester to a Device Under Test (DUT).
- also known as test lead
- flexible, insulated wires

Answer 26

Test Probes

Question 27

When you are using analog multimeter, what error do you get mostly?
- a perceived difference in the position of an object when viewed from two different lines of sight.

Answer 27

Parallax Error