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2A-1
Chapter 2A
Theory of Operation (2635A)
Title Page
2A-1. Introduction ..........................................................................................2A-3
2A-2. Functional Block Description...............................................................2A-3
2A-3. Main PCA Circuitry.........................................................................2A-3
2A-4. Power Supply...............................................................................2A-3
2A-5. Digital Kernel ..............................................................................2A-3
2A-6. Serial Communication (Guard Crossing) ....................................2A-6
2A-7. Digital Inputs and Outputs...........................................................2A-6
2A-8. A/D Converter PCA.........................................................................2A-6
2A-9. Analog Measurement Processor ..................................................2A-6
2A-10. Input Protection Circuitry............................................................2A-6
2A-11. Input Signal Conditioning............................................................2A-6
2A-12. Analog-to-Digital (A/D) Converter .............................................2A-6
2A-13. Inguard Microcontroller Circuitry...............................................2A-6
2A-14. Channel Selection Circuitry.........................................................2A-7
2A-15. Open Thermocouple Check Circuitry..........................................2A-7
2A-16. Input Connector Assembly...............................................................2A-7
2A-17. 20 Channel Terminals..................................................................2A-7
2A-18. Reference Junction Temperature.................................................2A-7
2A-19. Display PCA ....................................................................................2A-7
2A-20. Memory Card Interface PCA...........................................................2A-7
2A-21. Detailed Circuit Description ................................................................2A-7
2A-22. Main PCA ........................................................................................2A-7
2A-23. Power Supply Circuit Description...............................................2A-8
2A-31. Digital Kernel ..............................................................................2A-10
2A-42. Digital I/O....................................................................................2A-19
2A-43. Digital Input Threshold ...............................................................2A-19
2A-44. Digital Input Buffers....................................................................2A-19
2A-45. Digital and Alarm Output Drivers...............................................2A-19