This document discusses multimeters, which are devices that measure voltage, current, resistance and other electrical properties. It defines a multimeter and identifies two main types: analog and digital. Analog multimeters use a needle to indicate readings, while digital multimeters use a digital display. The document explains the basic functions of multimeters, which include measuring voltage, current, resistance, capacitance and inductance. It then provides steps for properly using both analog and digital multimeters, such as selecting the correct measurement type and range.

2. At the end of the lesson, learners will
be able to:
1. Define multitester;
2. Identify the types of multitester;
3. Explain the functions of
multitester; and
4. Demonstrate proper usage of
multitester.

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12. TWO TYPES OF
MULTITESTER

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14. ANALOG MULTIMETER
Analog multimeters are multifunctional
electrical measuring instruments with
indication of readings by means of an arrow
(analogue) scale.

15. DIGITAL
MULTIMETER
Digital multimeters are modern, reliable
measuring devices characterized by high
measurement accuracy and diverse functionality.
Digital devices have replaced analog ones due to
the possibility of widespread use of semiconductor
technologies. Currently, most of the manufactured
multimeters are digital. Specialists working with
electrical equipment, if necessary, can choose
among digital multimeters a model focused on
specific highly specialized tasks.

16. The main functions and capabilities of
multimeters
The main functions of multimeters:
● Measurement of direct and alternating
voltage,
● Measurement of direct and alternating
current,
● Measurement of resistance,
capacitance and inductance.

17. How to use
Digital
Multimeter

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When using the meter it is possible to follow a number of simple steps:
1. Turn the meter on.
2. Insert the probes into the correct connections - this is required because there may be
a number of different connections that can be used.
3. Set switch to the correct measurement type and range for the measurement to be
made. When selecting the range, ensure that the maximum range is above that
anticipated. The range on the DMM can then be reduced as necessary. However by
selecting a range that is too high, it prevents the meter being overloaded.
4. Optimise the range for the best reading. If possible enable all the leading digits to not
read zero, and in this way the greatest number of significant digits can be read.
5. Once the reading is complete, it is a wise precaution to place the probes into the
voltage measurement sockets and turn the range to maximum voltage. In this way if the
meter is accidentally connected without thought for the range used, there is little
chance of damage to the meter. This may not be true if it left set for a current reading,
and the meter is accidentally connected across a high voltage point.

19. How to use
Analog
Multimeter

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When using the meter it is possible to follow a number of simple steps:
1. Insert the probes into the correct connections - this is required because there may be a number
of different connections that can be used. Be sure to get the right connections, and not put them
into the ones for a low current measurement if a high voltage measurement is to be made - this
could damage the multimeter.
2. Set the switch to the correct measurement type and range for the measurement to be made.
When selecting the range, ensure that the maximum for the particular range chosen is above that
anticipated. The range on the multimeter can be reduced later if necessary. However by selecting
a range that is too high, it prevents the meter being overloaded and any possible damage to the
movement of the meter itself.
3. Optimise the range for the best reading. If possible adjust it so that the maximum deflection of
the meter can be gained. In this way the most accurate reading will be gained.
4. Once the reading is complete, it is a wise precaution to place the probes into the voltage
measurement sockets and turn the range to maximum voltage position. In this way if the meter is
accidentally connected without thought for the range to be used, there is little chance of damage to
the meter. This may not be true if it left set for a current reading, and the meter is accidentally
connected across a high voltage point.