Theory Of Operation - Test Equipment Depot 88 Service Manual

2-1. Introduction .......................................................................................... 2-3
2-2. Functional Block Description............................................................... 2-3
2-3. Detailed Circuit Description ................................................................ 2-5
2-4. Input Overload Protection................................................................ 2-5
2-5. Rotary Switch................................................................................... 2-5
2-6. Input Signal Conditioning Circuits .................................................. 2-5
2-7. Volts............................................................................................. 2-6
2-8. Ohms............................................................................................ 2-6
2-9. Analog Section of Integrated Meter IC (U4) ................................... 2-6
2-10. Microcomputer Control ................................................................... 2-8
2-11. Peripherals to U4.............................................................................. 2-9
2-12. AC Buffer .................................................................................... 2-10
2-13. AC Converter............................................................................... 2-10
2-14. Active Filter ................................................................................. 2-10
2-15. A/D Converter ............................................................................. 2-10
2-16. Beeper .......................................................................................... 2-10
2-17. Reference Voltage ....................................................................... 2-10
2-18. Power Supply............................................................................... 2-10
2-19. Display ............................................................................................. 2-11
2-20. Rotary Knob Switch and Potentiometer .......................................... 2-11

Theory of Operation

Title
Chapter 2
Page
2-1