# ELECTRICAL-ELECTRONICS INSTRUMENTATION (II) LAGOS CITY POLYTECHNIC IKEJA
ELECTRICAL/ELECTRONICS INSTRUMENTATION (II) THEORY
COURSE TITLE: ELECTRICAL-ELECTRONICS INSTRUMENTATION (II)
COURSE CODE:EEC 236
PROGRAMME:ND IN ELECTRICAL/ELECTRONICS ENGINEERING
LECTURER: ENGR IGBABINI WILSON
LEVEL: ND II
SEMESTER: 1ST

LIST OF CONTENTS

WEEK 1: Cathode Ray Oscilloscope
1.1. Introduction 1
1.2. Cathode Ray OscilloscopeOperation 2

WEEK 2: Cathode Ray Tube

2.1. Introduction 5
2.1.1 The electron gun 5
2.1.2. The deflecting system 5
2.1.3. The fluorescent screen 6
2.2. A simple circuit diagram of (CRO) 7

WEEK 3: Measurement Of Voltages And Currents

3.1. Introduction 9
3.2. Measure of phase and frequency 10
3.2.1. Frequency measurements 11

WEEK 4: Power Factor Meter

4.1. Introduction 13.
4.2. Electrodynamic power factor meters 13
4.2.1. Principle of operation of electrodynamic power factor meter.15

WEEK 5: Measurement of Power And Power factor

5.1. Introduction 17
5.2. Power factor 17
5.3. Calculating power factor 19

WEEK 6:Wattmeters:

6.1. Introduction 23
6.2. Dynamometer wattmeter 23
6.2.1. construction 23
6.2.2. Operation 24
6.2.4. Errors 27-28
6.3. Deflecting torque 25

WEEK 7: Power measurement in three phase cct

7.1. Introduction 32
7.2. Three wattmeter method 32.
7.3. Two wattmeter method 33.
7.3.1. Two wattmeter method balanced load 36

WEEK 8: One wattmeter method.

8.1. Introduction 39
8.2.1. Balanced load lagging power factor 40

WEEK 9: Instruments selection and specifications.

9.1. Introduction 43
9.2. Factors of an instrument selection 42-45

WEEK 10: Importance of instruments in industries.

10.1. Introduction 47
10.2. Importance of measurement in industry 47
10.3. Pressure measurement 48
10.3.1. Importance of pressure measurement 49

WEEK 11: Temperature measurement.

11.1. Introduction 50
11.2. Types of thermometers 50
11.3. Classification of thermometers 51
11.3.1. Practical thermometers 51
11.3.2. Common thermometers 51
11.4. Importance of temperature measurement 51
11.5. Level measurement 52
11.5.1. How to obtain level measurement 52
11.5.2. Importance of level measurement 53

WEEK 12:Flowrate measurement.

12.1. Introduction 55
12.1.1. Importance of flowrate measurement 55
12.2. Measurement of density 56
12.3. Viscosity measurement 56
12.3.1. Importance of viscosity 57

WEEK 13: Humidity measurement.

13.1. Introduction 59

WEEK 14: Electrical electronics instruments.

14.1. Introduction 61
14.2. Types of electrical instruments 61
14.2.1. Indicating instruments 61
14.2.2. Recording instruments 61
14.2.3. Controlling instruments 62
14.3. Principles of operation of electrical instruments 62

WEEK 15: Essentials of indicating instruments.

15.1. Introduction 63
15.1.1. Deflecting torque 63
15.1.2. Controlling torque 64
15.1.3. Damping torque 64

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