Table of Contents
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Table of Contents
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 and 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 Plugs ....................................................................................................................................... 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 ................................................................................................................... 2-7
2.3.01 Introduction ............................................................................................................................................. 2-7
2.3.02 Procedure ................................................................................................................................................. 2-7
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 Tandem Demodulation ............................................................................................................................ 3-1
3.2.04 Single Harmonic / Dual Harmonic .......................................................................................................... 3-2
3.2.05 Internal / External Reference Mode ........................................................................................................ 3-2
3.2.06 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 - 7124 RCU ......................................................................................................... 3-4
3.3.03 Line Frequency Rejection Filter .............................................................................................................. 3-5
3.3.04 AC Gain and Dynamic Reserve............................................................................................................... 3-5
3.3.05 Anti-Aliasing Filter ................................................................................................................................. 3-6
3.3.06 Analog Fiber Links .................................................................................................................................. 3-7
3.3.07 Auxiliary Signal Input - Main Console ................................................................................................... 3-7
3.3.08 Main Analog-to-Digital Converter .......................................................................................................... 3-8
3.3.09 Reference Channel Inputs - 7124 RCU ................................................................................................... 3-8
3.3.10 Reference Channel Inputs- Main Console ............................................................................................... 3-8
3.3.11 Reference Channel .................................................................................................................................. 3-8
3.3.12 Phase-Shifter ........................................................................................................................................... 3-9
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