soalan measurement_pkm_2011.pdf
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2011
PERTANDINGAN KEMAHIRAN MALAYSIA
(ELEKTRONIK)
SOALAN
PERINGKAT AKHIR
NAMA: ______________________________________
NO. KP: ______________________________________
JABATAN PEMBANGUNAN KEMAHIRANKEMENTERIAN SUMBER MANUSIA
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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.
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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
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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)
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SCHEMATIC DIAGRAM: FIGURE 1
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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
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GND
VCC
TP13
+12V
C19104
C18104
C17
100uF/25V
C20100uF/25V
IN
1
2
OUT
3
GND
U3 LM7805CT
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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
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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
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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
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PCB COMPONENT LAYOUT
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PCB LAYOUT
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Pertandingan Kemahiran Malaysia (PKM)
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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
11 Capacitor for Ceramic 472 1 C4
12 Capacitor for Ceramic 474 1 C10
13 Capacitor for Ceramic 104 10C9, C11, C12,C13,C14,C15,
C16,C18, C19
14 Capacitor for Electric 100uF/25V 1 C1
15 Capacitor for Electric 100uF/100V 1 C3
16 Capacitor for Electric 100uF/100V 1 C5
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
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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
30 Potentiometer 5K 1 VR2
31 Potentiometer 5K
1 VR3
32 Potentiometer 50K 1 VR4
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
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