Maintenance

PCA Access and General 3-3. Display 3-4. 3-5. Performance 3-6. Initial 3-7. DC Voltage 3-8. AC Voltage 3-9. Resistance 3-10. Diode 3-11. DC mA 3-12. DC Amps 3-13. 3-14. 3-15. Supplemental Troubleshooting 3-16. Checking the Crystal 3-17. Checking The Reference 3-18. Checking Display Drive 3-19. Checking Beeper Drive 3-20. Tracing the VDC Signal These service instructions are for use by qualified personnel only. To avoid electric shock, do not perform any servicing other than that...

Table of Contents

Organization of the Service Manual 1-3. Conventions 2 Theory of 2-2. Functional Block Description 2-3. Detailed Description 2-4. Voltage Signal Conditioning 2-5. Current 2-6. 2-7. Additional 2-8. AC Converter 2-9. Active Filter 2-10. Rotary 2-11. A D 3-2. PCA Access and General Maintenance 3-3. Display Access 3-4. Cleaning 3-5. Performance Test 3-6. Initial Procedure 3-7. DC Voltage Test 3-8. AC Voltage Test 3-9. Resistance Test 3-10. Diode Test 3-11. DC mA 3-12. DC...

Introduction and Specifications

Organization of the Service 1-3. 1-4. This manual presents service information for the Fluke 77 Series III Multimeter. The manual includes a theory of operation, general maintenance procedures, performance tests, calibration procedures, troubleshooting information, a list of replaceable parts, and schematic diagrams. A meter under warranty will be promptly repaired or replaced (at Fluke's option) and returned at no charge. See the registration card for warranty terms. To locate an...

Theory of Operation

Fluke Series Diagram

Detailed 2-4. Voltage Signal 2-5. Current 2-6. 2-7. Additional 2-8. AC 2-9. Active 2-10. Rotary 2-11. A D This chapter contains a brief overview of the 77 Series III Multimeter, followed by a more detailed explanation of operation. The heart of the instrument consists of a two-chip CMOS system U1, a primarily analog IC, and U2, a calculator-style microcomputer see Figure 21 . The following paragraphs describe the 77 Series III Multimeter in more detail. While...