To sum up, our terms of reference will include the operating principles, basic features and techniques (including auxiliary apparatus) of the two important electrical methods of measurement: the bridge method and the potentiometer method, assuming that the measuring circuit is balanced by hand.
CONTENTS
Introduction 7
Chapter One. BASIC DEFINITIONS AND CONCEPTS 11
1-1. Classification of Methods of Measurement 11
1-2. General Remarks on Sensitivity 15
Chapter Two. PRIMARY AND SECONDARY STANDARDS OF ELECTRI CAL UNITS 20
2-1. General 20
2-2. Standards of Resistance 22
2-3. Standards of Capacitance 25
2-4. Standards of Inductance 27
2-5. Standards of E.M.F. 29
Chapter Three. DIRECT-CURRENT AND ALTERNATING-CURRENT NULL DETECTORS 31
3-1. Types of Null Detectors 31
3-2. The Moving-coil Galvanometer 34
3-3. Valve-type A. C. Null Detectors 39
Chapter Four. AUXILIARY EQUIPMENT 53
4-1. Types of Auxiliary Equipment. Requirements 53
4-2. D. C. Power Supplies 54
4-3. Voltage Stabilizers 56
4-4. A. C. Supplies 62
4-5. Auxiliary Amplifiers 67
Chapter Five. THE D.C. BRIDGE METHOD 70
5-1. The Bridge Circuit. Definition of the Bridge Method 70
5-2. The Four-arm (Wheatstone) Bridge 71
5-3. The Kelvin Double Bridge 78
5-4. The Sensitivity of D.C. Bridges 86
5-5. Unbalanced Bridges. Comparison Sets 94
5-6. Construction of D. C. Bridges 110
Chapter Six. ALTERNATING-CURRENT BRIDGE MEASUREMENTS 114
6-1. Properties and Classification of A. C. Bridges 114
6-2. The Sensitivity of A. C. Bridges 123
6-3. Balancing and Circle Diagrams of A.C. Bridges 134
6-4. Balance Convergence of A. C. Bridges 142
6-5. Independence of Adjustments and Measurement 151
6-6. Basic Types of A. C. Bridges 156
6-7. Quasi-balanced A. C. Bridges 180
6-8. A. C. Percentage Bridges 187
Chapter Seven. THE D. C. POTENTIOMETER METHOD193
7-1. Basic Principles and Development of the Potentiometer Method 193
7-2. Practical D. C. Potentiometers 210
7-3. The Sensitivity of D. C. Potentiometers 221
7-4. Applications of D. C. Potentiometers 227
Chapter Eight. THE ALTERNATING-CURRENT POTENTIOMETER METHOD 232
8-1. Special Features of the A.C. Potentiometer Method 232
8-2. Principles of Construction and Practical A.C. Potentiometers 236
8-3. Applications of A. C. Potentiometers 244
Chapter Nine. CONTROL OF STRAY EFFECTS 247
9-1. Principal Sources of Stray Effects 247
9-2. Control of Stray Effects in D. C. MeasuringCircuits 250
9-3. Control of Stray Effects in A.C. Measuring Circuits 252
Index 263
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