soalan measurement_pkm_2011.pdf

7/29/2019 Soalan Measurement_PKM_2011.pdf

1/14

1

2011

PERTANDINGAN KEMAHIRAN MALAYSIA

(ELEKTRONIK)

SOALAN

PERINGKAT AKHIR

NAMA: ______________________________________

NO. KP: ______________________________________

JABATAN PEMBANGUNAN KEMAHIRANKEMENTERIAN SUMBER MANUSIA


2/14

2

Project: Measurement

Time Limit: 2 hours

1.0 REQUIREMENTS

1.1 In this project, you are required to carry out the measurements and requiredadjustments of a given circuit a basic Waveform Generator.

1.2 In order to carry out the required tasks, you may need to refer to the followingdocumentations:

Circuit Schematic Diagram

PCB Layout Diagram

Component List

1.3 Unless otherwise stated, all waveforms and voltages are measured with referenceto ground (0V).

1.4 All waveforms recorded must include its amplitude and time scales.

2.0 BACKGROUND INFORMATION

The board consists of several basic circuits which connected together producesPWM waveforms. The test pins TP11 and TP12 show the PWM outputs. P3 headeroutput provides the product of the two waveforms.


3/14

3

3.0 CIRCUIT DESCRIPTION

3.1 The overall circuit diagram in shown Figure 1.

3.2 The DC Power supply can be varied up to 60V by adjusting the VR1.

3.3 The waveform generated by the sine wave generator is inverted by the IC U7A andappears at the output OUT1/1 (TP8). The frequency of the waveform can beadjusted by changing the variable resistor, VR4. The variable resistor, VR5, is used tovary its amplitude and VR6 for adjusting the offset level.

3.4 The frequency and the amplitude of the square wave output at TP2 can be variedby adjusting VR3 and VR4 respectively.

3.5 The frequency and the amplitude of the triangle waveform can be varied byadjusting VR7 and VR9 respectively.

4.0 TEST EQUIPMENT REQUIRMENTS

Dual DC Power Supply 1 set

Digital Oscilloscope 1 set

Desktop link to Oscilloscope 1 set

Assortment of connecting cables 1 set

5.0 INSTRUCTIONS TO THE COMPETITOR

Carry out the required adjustments and measurements. All measurements and resultsSHOULD be measured using the oscilloscope. The results must be saved in the massstorage media provided. All files should be saved inside a desktop folder namedPKM_MEASUREMENT.

5.1 Check and connect the +12V DC power supply to the circuit.

5.2 Adjust VR1 so thatthe DC voltage output at TP1 = +30V. Measure and save thewaveform under a filename Q5_2.

5.3 Adjust VR2 so thatthe DC voltage output at pin 3 of the P2 header = -12V. Measureand save the waveform under a filename Q5_3.

P2Pin 1

Pin 2


4/14

4

5.4 Adjust VR3 and VR4 to ensure a square wave at TP2, having the following properties:

Frequency = 100Hz

Ttotal = t1 + t2

t1 = 60% of Ttotal

t2 = 40% of Ttotal

Measure and save the waveform under a filename Q5_4.

5.5 Adjust the variable resistors VR3, VR4, VR5 and VR6to get a smooth sine wave of100Hz

and 5Vp-p. Measure and save the waveform at TP4 under a filename Q5_5.

5.6 Adjust the VR7 and VR8 so that the waveform at TP5 is 1 KHz and having 50% dutycycle (duration t1 = t2). Measure and save the waveform at TP5 under a filenameQ5_6.

5.7 Adjust VR9 to get 1 kHz, 6Vp-p waveform at TP7. Measure and save the waveformunder a filename Q5_7.

5.8 Measure the output waveform at test point TP8. Save the waveform under a filenameQ5_8.

5.9 Measure the output waveforms at test point TP9 (channel 1) and test point TP10(channel-2). Save the waveform under a filename Q5_9.

5.10 Measure the output waveforms at TP11 (channel 1) and TP12 (channel-2 ). Save thewaveform under a filename Q5_10.

5.11 Observe the output waveform at pin 1 of the header P3, by using pin 2 as thereference point. Save the waveform under a filename Q5_11.

P3

Pin 3

Pin 1

Pin 2 (ref)


5/14

5

SCHEMATIC DIAGRAM: FIGURE 1


6/14

6

Schematic: DC Power Supply

SWC1

SWE2

TCAP3

GND4

-VIN5

VCC6

IPK7

DRVC8

U1

MC34063U

SWC1

SWE2

TCAP3

GND4

-VIN5

VCC6

IPK7

DRVC8

U2

MC34063U

12

P1

Header 2

VR25K

R6

1K

R71K

R3

1K

L1

220mH

L2120mH

C1

100uF/25V

222

C2

C4472

D1

D2UF4002

GND

GND GND GND

GND

+12V

GND

GNDGND

Q2TIP122

Q1TIP122

R1

0R1/1W

R2

0R1/1W

R5

0R1/1W

DC +12V INPUT


7/14

7

GND

VCC

TP13

+12V

C19104

C18104

C17

100uF/25V

C20100uF/25V

IN

1

2

OUT

3

GND

U3 LM7805CT


8/14

8

Schematic: Sine Wave Output

VR450K

VR3

5K

VR5100K

R8

4K7

R10 51K

R11 0R1

R9

4K7

R1215K

R13240K

R1410K

C10

474

C9

104

+12V

SIN ADJ1

SIN OUT2

TRI. OUT3(DUTY

4

ADJ)5

V+6

FM BIAS7

FM SWEEP8

SQU. OUT9

TIMING10

V-11

SIN ADJ 12

NC13

NC14

U4

XR8038

+12V

+12V

+12V

+12V

-VCC

-VCC

-VCC

-VCC

-VCC

+12V

-VCC

TP2

TP3

O

GND

R15

10K

R17

10K

R164K7

8

1

4

3

2

U5A

TL082ACJG

8

4

75

6U5BTL082AC

GND

-VCC

+12V

VR6100K

+12V

-VCC

S

SQUAREWAVE

R10

R11


9/14

9

Schematic: Triangle output

2

3

11

4

11

U6A

TL084CN

5

6

72

4

11

U6B

TL084CNGND

+12V

-VCC

+12V

-VCC

GNDC11

104

C12

104

R18

100K

VR7

100K

VR9

100K

VR8

100K

-VCCTP5

TP6

+12V

-VCC

R20

10K

R19

10K

G

+12V

SQUAREWAVE

TRIANGLEWAVE


10/14

10

Schematic: PWM Output

2

31

1

4

11

U8ALM324AN

5

67

2

4

11

U8BLM324AN

+12V

-VCC

-VCC

+12V

C14104

Q49013

Q39013

R28470R

R27470R

R26

10K

R25

10K

OUT1

OUT1/1

OUT2

VCC

VCC

GND

GND

+12V

-VCC

TP9

TP10

GND

GND

+12V

CMP1

CMP2

CMP1

CMP2

R29330R

R30330R

VCC

VCC

C15104

C116104

+12V

GND GND

+12V

,.,

'

;

.

.,

,,

,.

+12VU9 TLP250

U9 TLP250


11/14

11

PCB COMPONENT LAYOUT


12/14

12

PCB LAYOUT


13/14

Pertandingan Kemahiran Malaysia (PKM)

13

PARTS LIST

Item Parts name Parts value(Model) Qty Reference number

1 DC-to-DC ConverterControl Circuit MC34063U 2 U1,U2

2

Three-TerminalMedium CurrentPositive VoltageRegulator

MC78M05BT 1 U3

3Precision WaveformGenerator

XR8038 1 U4

4JFET-InputOperational Amplifier

TL082ACJG 2 U5,U7

5JFET-InputOperational Amplifier

TL084CN 1 U6

6

Transistor Inverter For AirConditionor IGBT Gate

Drive Power Mos Fet GateDrive

TLP250 2 U9,U10

7Quad Low-PowerOperational Amplifier

LM324AN 1 U8

8 Diode UF4007 1 D1

9 Diode UF4002 1 D2

10 Capacitor for Ceramic 222 1 C2



13 Capacitor for Ceramic 104 10C9, C11, C12,C13,C14,C15,

C16,C18, C19

14 Capacitor for Electric 100uF/25V 1 C1



17 Capacitor for Ceramic 100uF/25V 1 C17.C20

18 Resistor 0R1/1W 1 R1,R2,R5

19 Resistor 1K, 0.25W, 1% 4 R3, R4, R6, R7

20 Resistor 4K7, 0.25W, 1% 4 R8, R9,R16.R21

21 Resistor 51K, 0.25W, 1% 1 R11

22 Resistor 0R1, 0.25W,0.5% 1 R10


14/14

Pertandingan Kemahiran Malaysia (PKM)

23 Resistor 15K, 0.25W, 1% 1 R12

24 Resistor 240K, 0.25W, 1% 1 R13

25 Resistor10K

, 0.25W, 1%10

R14,R15,R17,R19,R20,R22,R23,R24,R25,R26

26 Resistor 100K, 0.25W, 1% 1 R18

27 Resistor 330, 0.25W, 1% 2 R29,R30

28 Resistor 470, 0.25W, 1% 2 R27,R28

29 Potentiometer 50K 1 VR1


31 Potentiometer 5K

1 VR3


33 Potentiometer 100K 5 VR5,VR6, VR7, VR8 ,VR9

34 Test Point Pin LC-2-G 16

TP1, TP2, TP3, TP4,TP5, TP6, TP7, TP8,TP9, TP10, TP11,TP12, TP13, TP14,

35 Inductor 220mH 1 L1

36 Inductor 120mH 1 L2

37 DIP Socket RIC-DIP-8 6 U1, U2,U5,U7,U9,10

38 DIP Socket RIC-DIP-14 3 U4,U6,U8

39 Connector Header 2 PIN 2 P1, P3

40 Connector Header 3 PIN 1 P2

41 Transistor TIP122 1 Q1,Q2

42 Transistor 9013 2 Q3,Q4

soalan measurement_pkm_2011.pdf

Documents