ii Table of Contents
Theory of Operation 4-1
4.1 System Block Diagram 4-1
4.2 Main Board 4-2
4.2.1 Front End 4-3
4.2.2 Analog to Digital Converter 4-5
4.2.3 Trigger 4-6
4.2.4 Time Base 4-9
4.2.5 Calibrator 4-10
4.2.6 Scan DAC 4-10
4.2.7 Main Board Control 4-10
4.3 Computer 4-11
4.3.1 Operating System 4-11
4.3.2 Memory 4-11
4.3.3 Interfaces 4-11
4.3.4 Storage Devices 4-11
4.3.5 Video port 4-11
4.4 PCI Card 4-12
4.4.1 PCI Interface 4-12
4.4.2 Local bus for acquisition 4-13
4.4.2.1 Control 4-13
4.4.2.2 Acquisition Data 4-13
4.4.3 Dallas OneWire Interface 4-13
4.4.4 Audio amplifire 4-13
4.5 Front Panel 4-13
4.5.1 Key board 4-14
4.5.2 Panel Board 4-14
4.5.2.1 Encoders 4-14
4.5.2.2 Touchscreen Interface 4-14
4.6 Display and Touchscreen 4-15
4.6.1 Color LCD Module 4-15
4.6.2 Backlight Inverter 4-15
4.6.3 Touch Screen 4-15
4.6.4 LVDS receiver 4-15
4.7 Power Supply 4-16
4.7.1 Input Voltages 4-16
4.7.2 Output Voltages 4-17
4.7.3 Basic Operation 4-17
4.7.3.1 Pre-converter 4-17
4.7.3.2 Main Converter 4-17
4.7.3.3 House Keeping Power Supply 4-17
4.7.3.4 +5VDIG and 3.3V DC/DC(Daughter Board) 4-17
4.7.3.5 +5VANA and 2.5V DC/DC (Daughter Board) 4-18
4.7.3.6 +9 and 12V DC/DC (Daughter Board) 4-18
4.7.3.7 -5V and –12V Forward converter 4-18
4.7.3.8 Filter Circuits (Daughter Boards) 4-18
4.7.4 Connector Assignments 4-18
4.7.5 Output Voltage Adjustment Range 4-21
4.7.6 +5VSB Standby Supply Rail 4-21
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