1. Institute Of Applied Technology
ATE 1012
Grade 10
Eng. Rose Hasan

2.  Be familiar with the usage of Multi-meters,
Oscilloscopes and Function Generators
 Perform Measurements of electrical
quantities using measuring instruments
 Test diodes and connectivity
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3.  Introduction
 Multimeter
 Voltage Measurement
 Current Measurement
 Resistance Measurement
 Diode Testing
 Continuity Test
 Function Generator
 Oscilloscope
 Practical Tasks
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4.  Measuring and Test Equipment are used to:
 measure electrical quantities
 test electrical components
 generate different types of signals to test the
response of the circuit to that signal.
 Measuring and test equipment can be used to:
 troubleshoot electrical problems in many industrial
and household devices such as batteries, lamps,
motor controls and wiring systems
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5. Eng. Rose Hasan

6.  Purpose: A multi-meter is an electronic
measuring instrument that combines several
functions in one unit. It is used to:
 measure voltage, current and resistance and to
test diodes and connectivity
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8.  Types: There are two types of
multimeters:
 analog & digital
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9. Eng. Rose Hasan

10.  Voltage Measurement (Voltmeter): To
measure the DC voltage across electrical
components in a circuit, follow these steps:
 Select on the digital multi-meter's
setting switch on the largest voltage range.
 Connect the positive (RED) (+) lead to the part of
the circuit that is connected to the positive (+)
side of the supply (battery).
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11.  Connect the negative (BLACK) (-) lead to the part
of the circuit that is connected to the negative (-)
side of the supply (battery).
 Switch on the multi-meter by pressing "POWER"
button. Then select the best range that will give
you the most accurate results.
 Record the reading and the unit that are displayed
in the multimeter's display.
http://serc.carleton.edu/sp/compadre/interactive/examples/19095.ht
ml
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12.  Items Required:
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13.  Measure the voltage across the batteries
using a multi-meter:
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14.  Record your readings on the following table.
The true value is the value written on the
battery
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15.  3. Compare the measured value with the true
value of the voltage written in the battery. Is the
measured value close to the real value? If no,
state why?
 ______________________________________
 4. You can test a battery using Multi-meter by:
 (a) Voltage measurement
 (b) Connectivity test
 (c) Diode Test
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16.  Current Measurements : To measure the DC
current flowing in electrical circuit, follow
these steps:
 Plug the BLACK (-) probe into the COM input
jack and the RED (+) probe into the mA or A
input jack.
 Adjust the digital multi-meter for current
measurements .
 Switch off the power in the circuit.
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17.  Break the circuit between elements where the
current to be measured.
 Insert the probes of the multi-meter in the place
where do you break the circuit.
 Switch on the multi-meter.
 Select the best range that will give you the most
accurate results.
 Record the reading and the unit that are displayed
in the multi-meter's display
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18. Eng. Rose Hasan

19.  Resistance Measurements (Ohmmeter): To
measure the resistance of a resistor, follow
these steps:
 Turn Off the power to the circuit and remove the
components to be tested.
 Select on the digital multi-meter's setting
switch on the lowest resistance range.
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20.  Plug the BLACK (-) probe into the COM input
jack and the RED (+) probe into the Ώ input
jack.
 Connect the probe tips across the component you
want to measure its resistance
 Switch on the multi-meter and select the best
range that will give you the most accurate results.
 Record the reading and the unit that are displayed
in the multimeter's display.
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21. Eng. Rose Hasan

22.  Items Required:
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23.  Measure the resistance across different
resistors using a multimeter and color code
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24.  2. Record your readings on the following
table
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25.  3. Compare the value of resistance measured
by the multi-meter and color code. Are the
values close to each other?
 --------------------------------------------------------
--------------------------------------------------------
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26.  Items Required:
 Resistors (200Ώ), multi-meters
 Electricity & Electronics Constructor, EEC470
 Basic Electricity and Electronics Kit EEC471-2
 Power supply unit
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27.  Construct the simple circuit shown below. Use 200 Ώ
resistor values.
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28.  Connect the multi-meter to the power supply.
 Make sure that the variable dc control knob is
fully counter clockwise, and then switch on
the power supply.
 Increase the applied voltage in 2 V steps from
0 V up to 5 V.
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29.  At each step measure the current flowing in the
resistor. Record your reading in the following
table:
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30.  To measure the resistance of a resistor, follow
these steps:
 Turn Off the power to the circuit and remove the
components to be tested.
 Select on the digital multi-meter's setting
switch on the lowest resistance range.
 Plug the BLACK (-) probe into the COM input
jack and the RED (+) probe into the Ώ input
jack.
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31.  Connect the probe tips across the component you
want to measure its resistance
 Switch on the multi-meter and select the best
range that will give you the most accurate results.
 Record the reading and the unit that are displayed
in the multimeter's display.
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32.  To test if the diode is functioning or not, follow
these steps:
 Adjust the digital Multi-meter for diode-testing .
 Connect the positive lead (Red) (+) to the anode
(A(+)) and connect the negative lead (BLACK) (-)
to the cathode (K(-))
 Switch on the multi-meter. For a diode in a good
condition the reading will be ≤ 300 mV for Ge
diode and ≤ 700 mV for Si diode.
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34.  Now connect the (RED) (+) lead to the (K(-)) and
(BLACK) (-) lead to the (A(+))
 For a diode in a good condition the reading will be
for both types.
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35.  To test if two points are electrically
connected, follow these steps:
 Turn Off the power to the circuit
 Adjust the digital Multi-meter for continuity-
testing and Switch on the multi-meter.
 When the probes aren't touching, the display
shows "1“.
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37.  When you touch
the tips of the
probes together,
the display
changes to a three
digit mode. The
multi-meter will
also emit a beep.
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38.  Purpose: Function generator
is used to produce different
waveform such as:
 Sine
 Square
 Triangular
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39.  It is used to test and examine the response of
an electrical circuit to that signal.
 (i.e. the motor response to a square or triangular
signal).
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40.  Main Control Keys: The function generator
has many control keys to control the:
 waveform shape
 amplitude
 frequency
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41.  The following table shows function generator
main keys and their usage.
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42.  Purpose: Oscilloscope is a device that is used
to display different waveforms
simultaneously
 (i.e the input and output of an amplifier).
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43.  Main Control Keys: Oscilloscope has many
control keys to scale the:
 amplitude
 periods of the displayed waveform.
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44.  The following table shows some oscilloscope
main keys and their usage.
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45.  Items Required:
 Function Generator
 Oscilloscope
 speaker
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47. Oscilloscope
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49. Oscilloscope Lab Worksheet
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50. 1. Connect the function generator and
oscilloscope as shown below.
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51. 2. Set the function generator to give 5v pk and 1 kHz.
3. Select channel A on the oscilloscope. Set the volt/division
scale to 5v and time/division to 250 us (μs).
4. Amplitude Measurement: measure the pk-pk voltage
of the waveform as seen in the following:
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52.  Volt/division scale = -----------------------------
 No. of divisions = -----------------------------
 Pk-Pk voltage = -----------------------------
5. Period Measurements: measure the period
of the waveforms seen in figure
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53.  Time/division scale = -----------------------------
 No. of divisions = -----------------------------
 T (Period) = -----------------------------
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54.  Be prepared for a Quiz next Class in module
#4.
 Do Homeworks 1 & 2 (From my Wiki).
 Next Class: Start with Module #5
Eng. Rose Hasan