Exp. No.2: Basic Usage of An Analog Oscilloscopefkee.uthm.edu.my/images/docs/labsheet/1/BEJ10801/BEJ... · 2019. 9. 8. · Fundamental Electronic Laboratory (BEJ10801) ii Exp. No.2:

C

Name Matric no. Section:

1.

Instructors’ name:

2.

3.

4.

5.

Title Time/ Date

Experiment no.: 02

Experiment title : Basic Usage of An Analog Oscilloscope

FOR INSTRUCTORS USE ONLY

Domain Item Subtotal Total

C Question /15

/20 Conclusion /05

P Pre laboratory /20

/60 Results and analysis /20

Lab activities /20

A Demonstration (understanding) /10

/20 Ethics /10

TOTAL MARKS /100

BEJ10801 – Fundamental Electronic Laboratory

Instruction Sheet

Basic Usage of Oscilloscope

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Fundamental Electronic Laboratory (BEJ10801) Exp. No.2: Basic Usage of An Analog Oscilloscope

ii

FKEE, SEM01 Session 2019/20

Table of Content

Table of Content ii

Instruction 1

Pre Laboratory 2

1.0 Title 5

2.0 Outcomes 5

3.0 Overview 5

4.0 List of Equipment 5

5.0 Experiment Procedures 6

5.1 CALIBRATION OF AN ANALOG OSCILLOSCOPE 6

5.2 DC MEASUREMENT FOR SERIES CIRCUIT 7

5.3 DC MEASUREMENT IN PARALLEL CIRCUIT 7

6.0 Results and Analysis 9

7.0 Questions 10

8.0 Conclusions 10

9.0 Related course(s) 10

10.0 References 10

Fakulti/Pusat Pengajian (Faculty/Centre) :

Faculty of Electrical and Electronic Engineering

Mukasurat (Page):

1

Kod Kursus (Course Code):

BEJ 10801

Nama Kursus (Name of Course) :

Fundamental Electronic Laboratory

Kursus Pra Syarat (Prerequisite Courses) :

None

Kredit

(Credit):

1

Kuliah

(Lecture):

0

Tutorial

:

0

Amali

(Practical):

2

Edisi (Edition) : 2 Tarikh Keluaran (Published date) : September

2019


Instruction

1. Grouping: Lab group is not predetermined and consists of 3 members (maximum).

2. Pre-Lab Assignment: Must be submitted to the instructor at the beginning of lab sessions.

Verified by the instructor and returned to the students at the end of lab session. The verified

pre-lab must be attached with the final report for submission.

3. Lab Activities: All laboratory activities must be carried out in this laboratory and to be

completed within the given times.

4. Demonstration: Student must demonstrate the experiment to the respective instructor.

5. Report Submission: Report must be submitted to the respective instructor upon

COMPLETION of lab session.



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Pre Laboratory

1. Explain key purposes of an oscilloscope.

2. Explain the main difference of DC measurement and AC measurement.



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3. Sketch the connection of the circuit in Figure 2 and Figure 3 on the following bread board diagram with correct electronic schematic symbols..

Figure 2 connection



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Figure 3 connection



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1.0 Title

Basic Usage of an Analog Oscilloscope

2.0 Outcomes

The desired outcomes to be achieved at the end of the experiment

After completing this laboratory, student should be able to:

2.1 Apply the basic function of an oscilloscope. ( PLO2-PS-C3) 2.2 Measure, read and record DC voltage in series and parallel resistance circuit. (PLO5-TS-

P5)

2.3 Present DC current in series and parallel circuit using standard resistor 1 ohm. (PLO9-LS-

A2)

3.0 Overview

Calibration of the oscilloscope is an important task that is done before making any measurements

using oscilloscope. Buttons on the front panel of the oscilloscope have their specific function that

affect the measurement being made. By choosing the correct button, the measurement taken will

be precise and correct.

4.0 List of Equipment

List of equipment used:

4.1 Analog oscilloscope 4.2 Oscilloscope probe 4.3 DC power supply 4.4 1 x 1kΩ resistor 4.5 1 x 470Ω resistor 4.6 1 x 270Ω resistor 4.7 1 x 1Ω resistor



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5.0 Experiment Procedures

5.1 CALIBRATION OF AN ANALOG OSCILLOSCOPE

Procedures :

1. Turn on the oscilloscope.

2. Chose 0.5 msec/div of the horizontal part and 1 V/div of VOLTS/DIV selector in the

vertical part.

3. Used X1 probe and put the probe at input Channel 2 and then select AC at AC-GND- DC.

4. Put probe hook at Probe Adjust point and the other at GND point.

5. For trigger part, put source to CH2( Channel 2) and Coupling to DC

6. Vary the CAL dial until the wave on the screen looks like as Figure 1.

7. Repeat step 3 to step 6 for Channel 1 (CH1 )

Hint:

Period, T = 1

𝑓=

1

1𝑘𝐻𝑧= 1𝑚𝑠𝑒𝑐

1kHz

2.5Vp-p

Figure 1: Calibration Signal



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5.2 DC MEASUREMENT FOR SERIES CIRCUIT

Procedures

1. Connect series circuit as Figure 2.

2. Select Channel 1 or Channel 2 and let the selector AC –GND – DC to DC.

3. Hook the probe across each resistor and measure the response voltages.

4. Now connect a standard resistor 1Ω in series with the other resistor and put the probe

across the 1Ω resistor.

5. Record the reading.

6. By using Ohm’s law:

𝑉 = 𝐼𝑅

The value of current (A) in the circuit is :

𝐼 = 𝑣𝑎𝑙𝑢𝑒 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑 𝑎𝑐𝑟𝑜𝑠𝑠 1Ω

5.3 DC MEASUREMENT IN PARALLEL CIRCUIT

Procedures

1. Connect series circuit as Figure 3.

2. Select Channel 1 or Channel 2 and let the selector AC –GND – DC to DC.

3. Hook the probe across each resistor and measure the response voltages.

4. Connect a standard resistor 1Ω in series with the other resistor and put the probe across

1kΩ 470Ω

270Ω 20V

Figure 2: The series circuitry of DC measurement

I

+ V1 -

+ V2 -

- V +

- V3

+



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the 1Ω resistor and measure 𝐼, 𝐼1, 𝐼2 indirectly.

5. Record the readings.

6. By using Ohm’s law:

𝑉 = 𝐼𝑅

The value of current (A) in the circuit is :

𝐼 = 𝑣𝑎𝑙𝑢𝑒 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑 𝑎𝑐𝑟𝑜𝑠𝑠 1Ω

𝐼1 = 𝑣𝑎𝑙𝑢𝑒 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑 𝑎𝑐𝑟𝑜𝑠𝑠 1Ω

𝐼2 = 𝑣𝑎𝑙𝑢𝑒 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑 𝑎𝑐𝑟𝑜𝑠𝑠 1Ω

7. Check the value of the current, 𝐼, using Kirchhoff’s Current Law:

𝐼 = 𝐼1 + 𝐼2

1kΩ

470Ω 20V

Figure 3: The parallel circuitry of DC measurement

270Ω

I

I1 I2 + V1 - - V + +

V2 - +

V3 -



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6.0 Results and Analysis

1. Experiment 5.1: List screen shots of the calibrated Channel 1 and Channel 2 of the oscilloscope.

2. Experiment 5.2: Complete Table 1.

Table 1

V1 V2 V3 I

1kΩ 470Ω 270Ω 1Ω Measured

*Please state the unit of each measurement.

And, also prove that:

V = 𝑉1 + 𝑉2 + 𝑉3 = 𝐼𝑅𝑇 where,

𝑅𝑇 = 𝑅1 + 𝑅2 + 𝑅3 = 1𝑘Ω + 470Ω + 270Ω = 1.740kΩ

3. Experiment 5.3: Complete Table 1.

Table 2

V1 V2 V3 I I1 I2

1kΩ 270Ω 470Ω 1Ω 1Ω 1Ω Measured

*Please state the unit of each measurement.

And, also prove that:

I = 𝐼1 + 𝐼2 𝑉2 = 𝑉3

V = 𝑉1 + 𝑉2



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7.0 Questions

1. Why an oscilloscope needs to be calibrated at the beginning of usage?

2. For experiment 5.1 to 5.3, explain the effect of reading current via 1Ω resistor if all existing resistors are reduced by 100 times?

3. What are the possible errors and sources of errors? Justify them.

8.0 Conclusions Summarize the use of an oscilloscope in DC measurement.

9.0 Related course(s) BEJ 10702 - Instrumentation and Measurement.

10.0 References

1. J. P. Bentley, Principles of Measurement System, 3rd Edition. Pearson Prentice Hall, 1995. Call number: QC53 .B46 1995

2. Principles of Measurement System, (Fourth Edition); J.P. Bentley, Pearson Prentice Hall, 2005.

3. R. G. Gupta, Electronic Instruments and Systems: Principles, Maintenance and Troubleshooting, McGraw Hill, 2001. Call number: TK7870.2 .G86 2001

4. D. Jones, and C. A. Foster, Electronic Instruments and Measurements. Prentice Hall International Edition, 1991. Call number: TK7878.4 .J66 1991

5. D. A. Bell, Electronic Instrumentation and Measurements, 2nd Edition. Prentice Hall Career and Technology, 1994. Call number: TK7878 .B45 1994

Exp. No.2: Basic Usage of An Analog Oscilloscopefkee.uthm.edu.my/images/docs/labsheet/1/BEJ10801/BEJ... · 2019. 9. 8. · Fundamental Electronic Laboratory (BEJ10801) ii Exp. No.2:

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