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Table of Contents
Chapter Title Page
1 Introduction and Specifications........................................................ 1-1
1-1. Introduction ......................................................................................... 1-3
1-2. Options and Accessories ..................................................................... 1-3
1-3. Operating Instructions ......................................................................... 1-3
1-4. Organization of the Service Manual ................................................... 1-4
1-5. Conventions ......................................................................................... 1-5
1-6. Specifications ...................................................................................... 1-7
2 Theory of Operation (2620A/2625A).................................................. 2-1
2-1. Introduction ........................................................................................ 2-3
2-2. Functional Block Description .............................................................. 2-3
2-3. Main PCA Circuitry ........................................................................ 2-3
2-4. Power Supply .............................................................................. 2-3
2-5. Digital Kernel ............................................................................. 2-3
2-6. Serial Communication (Guard Crossing) ................................... 2-6
2-7. Digital Inputs and Outputs .......................................................... 2-6
2-8. A/D Converter PCA ........................................................................ 2-6
2-9. Analog Measurement Processor ................................................. 2-6
2-10. Input Protection Circuitry ........................................................... 2-6
2-11. Input Signal Conditioning .......................................................... 2-6
2-12. Analog-to-Digital (A/D) Converter ............................................ 2-6
2-13. Inguard Microcontroller Circuitry .............................................. 2-6
2-14. Channel Selection Circuitry ....................................................... 2-7
2-15. Open Thermocouple Check Circuitry ......................................... 2-7
2-16. Input Connector Assembly ............................................................. 2-7
2-17. 20 Channel Terminals ................................................................. 2-7
2-18. Reference Junction Temperature ................................................ 2-7
2-19. Display PCA ................................................................................... 2-7
2-20. Memory PCA (2625A Only) ........................................................... 2-7
2-21. IEEE-488 Option (-05) ................................................................... 2-7
2-22. Detailed Circuit Description ............................................................... 2-8
2-23. Main PCA ....................................................................................... 2-8
2-24. Power Supply Circuit Description .............................................. 2-8