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					Abu Dhabi National Oil Co. ADNOC Technical Institute

INSTRUMENTATION
INDUSTRIAL ELECTRONICS III

UNIT 3 PRACTICAL TASKS

PRACTICAL TASKS DATE OF ISSUE 8-DEC-09

PAGE 1 OF 13 IN-10-03

ADNOC TECHNICAL INSTITUTE

UNITS IN THIS COURSE
UNIT 1 OPERATIONAL AMPLIFIER

UNIT 2

LOGIC CIRCUITS

UNIT 3

PRACTICAL TASKS

PRACTICAL TASKS DATE OF ISSUE 8-DEC-09

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ADNOC TECHNICAL INSTITUTE

TABLE OF CONTENTS
Paragraph PRACTICAL TASK 1 PRACTICAL TASK 2 PRACTICAL TASK 3 Page 4 9 12

PRACTICAL TASKS DATE OF ISSUE 8-DEC-09

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ADNOC TECHNICAL INSTITUTE PRACTICAL TASK 1 THE OPERATIONAL AMPLIFIER INTRODUCTION Using either a bread board or a printed circuit board (PCB) construct the basic circuit diagram below (see Figure PT 1).
TO +15V OUTPUT CONNECTION

8

7

6

5

741

1 NVERTING  + NON-NVERTING

2

3

4

TO 15V
LEAVE PINS 8,5 AND 1 UNCONNECTED

Figure PT 1 Basic OP-AMP Connections
After you have constructed the basic circuit, carry out the following tasks. INVERTER 1) Connect a 2.2k resistor between the output and the inverting input (pin 2) 2) 3) Connect a 2.2k resistor in series with pin 2. Connect a 1k resistor from pin 3 to earth.

PRACTICAL TASKS DATE OF ISSUE 8-DEC-09

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ADNOC TECHNICAL INSTITUTE 4) This will make an inverter as shown.
2.2k 2.2k +15V  + VIN 1k 15V VOUT

5) 6)

Switch on the  15V supply. Apply a 1V d.c level to VIN. Using an oscilloscope measure V 0. V0 should be 1V D.C.

7)

Switch off all supplies.

MULTIPLY AND DIVIDE 1) Change the basic circuit so that the input series resistor is 1k and the feedback resistor is 5k. 2) This will make a multiplier as shown.
5k 1k

 +

VIN

1k

VOUT

3) 4)

Switch on the  15V supply. Apply a 1V d.c. level to VIN. Using an oscilloscope measure V 0. V0 should be 5V d.c.

PRACTICAL TASKS DATE OF ISSUE 8-DEC-09

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ADNOC TECHNICAL INSTITUTE 5) 6) Switch off all supplies. Reverse the positions on the input and feedback resistors. This will make a divide circuit as shown.
1k 5k

 +

VIN 1k

VOUT

7) 8)

Switch on the  15V supply. Apply a 1V d.c level to VIN. Using an oscilloscope measure V 0. V0 should be  1/5V d.c

9)

Switch off all supplies.

ADDING AND SUBTRACTING 1) Make the feedback resistor 10k, and connect three 10k resistors to the inverting input to make:10k 10k 10k 10k V1 V2 V3 1k + VOUT



2)

Switch on the  15V supply.

PRACTICAL TASKS DATE OF ISSUE 8-DEC-09

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ADNOC TECHNICAL INSTITUTE 3) Apply a 1V d.c. level to V1, V2 and V3 inputs. Using an oscilloscope measure V0. V0 should be -3V d.c. 4) 5) Switch off all supplies. Apply a +1V d.c. level to V1, V2 inputs and a -2V d.c. level to V3. Using an oscilloscope measure V 0. V0 should be about 0V d.c.

SELF TEST Using your note book try and make: a) b) A voltage follower A subtracting (difference) amplifier using both inverting and non-inverting inputs.

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ADNOC TECHNICAL INSTITUTE THE INTEGRATOR 1) Construct, using the basic circuit, the circuit shown below.
10F 10k +15V  + VIN 1kHz 1V p to p Square Wave 4.7k 15V VOUT

2) 3)

Switch on the  15V supply. Apply a 1V p to p 1kHz square wave signal to the inverting input as shown.

4) 5) 6) 7) 8) 9)

Using an oscilloscope, sketch the input and output waveforms. Switch off all supplies. Change the integrating capacitor to 100F. Switch on all supplies. Using an oscilloscope sketch, the input and output waveforms. Switch off all supplies.

10) Does the circuit integrate? 11) Does a larger capacitor reduce the rate of reset (integration)?

SELF TEST Using your note book try and make a differentiator.

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ADNOC TECHNICAL INSTITUTE PRACTICAL TASK 2 LOGIC CIRCUITS INTRODUCTION An instrument technician's main work on logic circuits is concerned with checking that the logic circuits (PLC systems) give the correct outputs when the inputs are changed. The following practical task is given as practice at finding the logic output for given logic inputs.

1 1 Q

1)

0

Q=

1

2)

Q

0 1

Q=

1

3)

0 0

1

Q

Q=

1

4)

1 1

1

Q

Q=

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ADNOC TECHNICAL INSTITUTE

1

5)
1

=1

Q

Q=

1

6)
1

=1

Q

Q=

0

7)

0

0 1 1

Q Q=

1

0

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ADNOC TECHNICAL INSTITUTE

1

Q

8)

Q=

Q 0

Q=

1

9)

1

Q

Q=

1
0

Q

Q=

1

10)

0

Q=

1

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ADNOC TECHNICAL INSTITUTE PRACTICAL TASK 3 LOGIC CHIP CHECKING Most PLC systems use either CMOS 4000 series or TTL 7000 series chips. It is useful to be able to check these for serviceability. The following task is given so that you can check a chip. CHECKING A 7400 CHIP

14

13

12

11

10

9

8

1

2

3

4

5

6

7

The diagram shows the connections of a QUAD 2 input NAND gate. This item is checked as follows. 1) 2) Supply +5V d.c to pin 14 and earth pin 7. Using either a logic tester or LED connected to pin 3 check that the tester indicates a "1" or the LED is lighted. 3) The NAND gate is correct if a "1" (+5V) applied to both the input pins 1 and 2 causes the tester to change to a "0" or the LED goes out. 4) Repeat the above checks for the other three "NAND" gates:a) b) c) 5) A "1" on pins 4 and 5 causes pin 6 to go "0". A "1" on pins 10 and 9 causes pin 8 to go "0". A"1" on pins 13 and 12 causes pin 11 to go "0".

Make sure you indicate to the instructor if the "chip" is good. Bad chips should be thrown away. CHECKING A 4071

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ADNOC TECHNICAL INSTITUTE

14

13

12

11

10

9

8

1

2

3

4

5

6

7

The diagram shows the connections for a Quad 2 input "OR" gate CMOS chip. This is checked as follows. 1) 2) Supply +15V d.c. to pin 14 and earth pin 7.5 Use either a logic tester or an LED (with load resistor) connected to pin 3. Check that the LED lights when there is a "1" (about 10V d.c.) on either pin 1 or pin 2. 3) Repeat the above checks for the other three "OR gates: a) b) c) A "1" on pin 5 or pin 6 produces a "1" on pin 4. A "1" on pin 8 or pin 9 produces a "1" on pin 10. A "1" on pin 13 or pin 12 produces a "1" on pin 11.

SELF TEST The above tasks have shown you how to check both TTL and CMOS logic chips. The instructor will give you some different logic chips to try Ensure you have the correct pin connection checking on your own. diagrams for each chip.

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DOCUMENT INFO
Description: Instrumentation Course