Table Of Contents - Ametek 7280 Instruction Manual

Table of Contents

Chapter One, Introduction
1.1 How to Use This Manual.................................................................................................................................. 1-1
1.2 What is a Lock-in Amplifier?........................................................................................................................... 1-2
1.3 Key Specifications and Benefits....................................................................................................................... 1-3
Chapter Two, Installation & Initial Checks
2.1 Installation ........................................................................................................................................................ 2-1
2.1.01 Introduction ............................................................................................................................................. 2-1
2.1.02 Rack Mounting ........................................................................................................................................ 2-1
2.1.03 Inspection ................................................................................................................................................ 2-1
2.1.04 Line Cord Plug ........................................................................................................................................ 2-1
2.1.05 Line Voltage Selection and Line Fuses ................................................................................................... 2-1
2.2 Initial Checks.................................................................................................................................................... 2-3
2.2.01 Introduction ............................................................................................................................................. 2-3
2.2.02 Procedure................................................................................................................................................. 2-3
2.3 Line Frequency Filter Adjustment.................................................................................................................... 2-6
2.3.01 Introduction ............................................................................................................................................. 2-6
2.3.02 Procedure................................................................................................................................................. 2-6
Chapter Three, Technical Description
3.1 Introduction ...................................................................................................................................................... 3-1
3.2 Operating Modes .............................................................................................................................................. 3-1
3.2.01 Introduction ............................................................................................................................................. 3-1
3.2.02 Single Reference / Dual Reference.......................................................................................................... 3-1
3.2.03 Single Harmonic / Dual Harmonic .......................................................................................................... 3-1
3.2.04 Internal / External Reference Mode......................................................................................................... 3-2
3.2.05 Virtual Reference Mode .......................................................................................................................... 3-2
3.3 Principles of Operation..................................................................................................................................... 3-2
3.3.01 Block Diagram......................................................................................................................................... 3-2
3.3.02 Signal Channel Inputs.............................................................................................................................. 3-3
3.3.03 Line Frequency Rejection Filter .............................................................................................................. 3-4
3.3.04 AC Gain and Dynamic Reserve............................................................................................................... 3-4
3.3.05 Anti-Aliasing Filter.................................................................................................................................. 3-6
3.3.06 Main Analog-to-Digital Converter .......................................................................................................... 3-7
3.3.07 Reference Channel................................................................................................................................... 3-7
3.3.08 Phase-Shifter............................................................................................................................................ 3-8
3.3.09 Internal Oscillator - General .................................................................................................................... 3-9
3.3.10 Internal Oscillator - Update Rate............................................................................................................. 3-9
3.3.11 Internal Oscillator - Frequency & Amplitude Sweeps............................................................................. 3-9
3.3.12 Demodulators......................................................................................................................................... 3-10
3.3.13 Output Processor - Output Filters.......................................................................................................... 3-11
3.3.14 Output Processor - Output Offset and Expand ...................................................................................... 3-12
3.3.15 Output Processor - Vector Magnitude and Phase .................................................................................. 3-12
3.3.16 Output Processor - Noise Measurements............................................................................................... 3-13
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