® 39/41B Power Meter & Power Harmonics Analyzer Service Manual PN 601044 October 1995, Rev.1,9/00 © 1995,2000 Fluke Corporation, Inc. All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies. LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in Fluke’s opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke does not warrant that software will be error free or operate without interruption. Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price. Fluke reserves the right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country is submitted for repair in another country. Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period. To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal condition of operation or handling, including overvoltage failures caused by use outside the product’s specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs and obtain authorization before commencing the work. Following repair, the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB Shipping Point). THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY. Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision. Fluke Corporation Fluke Europe B.V. P.O. Box 9090 P.O. Box 1186 Everett, WA 98206-9090 5602 BD Eindhoven U.S.A. The Netherlands 11/99 To contact Fluke, call one of the following telephone numbers: USA: 1-888-99-FLUKE (1-888-993-5853) Canada: 1-800-36-FLUKE (1-800-363-5853) Europe: +31 402-678-200 Japan: +81-3-3434-0181 Singapore: +65-738-5655 Anywhere in the world: +1-425-446-5500 Or, visit Fluke's Web site at www.fluke.com. Table of Contents Chapter Title Page 1 Introduction and Specifications........................................................ 1-1 1-1. Introduction.......................................................................................... 1-3 1-2. Organization of the Service Manual..................................................... 1-3 1-3. Conventions.......................................................................................... 1-4 1-4. General Information............................................................................. 1-4 1-5. Description....................................................................................... 1-4 1-6. Power Requirements........................................................................ 1-4 1-7. Options, Accessories and Related Equipment.................................. 1-4 1-8. Operating Instructions...................................................................... 1-5 1-9. Specifications....................................................................................... 1-5 2 Theory of Operation........................................................................... 2-1 2-1. Introduction.......................................................................................... 2-3 2-2. Functional Block Description............................................................... 2-3 2-3. Circuit Operation.................................................................................. 2-5 2-4. Power-Up Sequence......................................................................... 2-5 2-5. Normal Operation............................................................................ 2-6 2-6. Circuit Descriptions.............................................................................. 2-6 2-7. Power Supplies................................................................................. 2-6 2-8. Power-On Circuit......................................................................... 2-6 2-9. VCC............................................................................................. 2-6 2-10. -22 Volts...................................................................................... 2-7 2-11. VEE.............................................................................................. 2-7 2-12. VDD............................................................................................. 2-7 2-13. VSS.............................................................................................. 2-7 2-14. VREF........................................................................................... 2-7 2-15. Low Battery Detection................................................................. 2-8 2-16. Power Reset................................................................................. 2-8 2-17. Input Conditioning........................................................................... 2-8 2-18. Difference Amplifier (Voltage Input).......................................... 2-8 2-19. Protection Circuit (Current Channel)........................................... 2-8 2-20. Gain Amplifier............................................................................. 2-8 2-21. Latch (U1).................................................................................... 2-8 2-22. Anti-Alias Filter........................................................................... 2-9 i 39/41B Service Manual 2-23. Level Shifter................................................................................ 2-9 2-24. A/D Converters................................................................................ 2-9 2-25. Digital Kernel................................................................................... 2-10 2-26. Digital Signal Processor (U2)...................................................... 2-10 2-27. Programmable Logic Device....................................................... 2-10 2-34. SRAMs (U5,U6,U7).................................................................... 2-13 2-35. EPROM (U4)............................................................................... 2-13 2-36. EEPROM (U11)........................................................................... 2-13 2-37. Serial EEPROM (U22)................................................................ 2-13 2-38. Keypad............................................................................................. 2-13 2-39. Display............................................................................................. 2-13 2-40. LCD Module................................................................................ 2-13 2-41. BackLight.................................................................................... 2-14 2-42. Contrast Control - EEPOT (U8)................................................. 2-14 2-43. Optical Interface (Model 41B Only)................................................ 2-14 2-44. Transmitter................................................................................... 2-14 2-45. Receiver....................................................................................... 2-14 3 General Maintenance......................................................................... 3-1 3-1. Introduction.......................................................................................... 3-3 3-2. Warranty Repairs and Shipping Information........................................ 3-3 3-3. General Maintenance Information........................................................ 3-3 3-4. Required Equipment......................................................................... 3-3 3-5. Static-Safe Handling........................................................................ 3-3 3-6. Cleaning................................................................................................ 3-4 3-7. Disassembling the Tester...................................................................... 3-4 3-8. Removing the Meter Case Bottom................................................... 3-4 3-9. Removing the PCA and Input Module............................................. 3-5 3-10. Removing the LCD Module............................................................. 3-6 3-11. Removing the Elastomeric Keypad.................................................. 3-6 3-12. Reassembling the Tester....................................................................... 3-6 3-13. Installing the PCA and Input Module.............................................. 3-6 3-14. Reassembling the Case Bottom........................................................ 3-7 4 Performance Testing and Calibration............................................... 4-1 4-1. Introduction.......................................................................................... 4-3 4-2. Required Equipment............................................................................. 4-3 4-3. Performance Tests................................................................................ 4-4 4-4. Warming-Up the Tester.................................................................... 4-4 4-5. Checking the Display Pixels............................................................ 4-4 4-6. Testing Voltage Performance........................................................... 4-4 4-7. Testing Amps Performance.............................................................. 4-5 4-8. Testing Watts, VA, VAR Performance............................................ 4-8 4-9. Testing Record Mode Performance................................................. 4-8 4-10. Testing Memory Mode Performance (Model 41B Only)................. 4-9 4-11. Testing Harmonics Volts Performance............................................ 4-9 4-12. Testing Harmonics Amps Performance........................................... 4-10 4-13. Testing Serial I/O Performance (Model 41B Only)......................... 4-11 4-14. Calibrating the Tester........................................................................... 4-12 4-15. Introduction...................................................................................... 4-12 4-16. Entering Calibration Mode............................................................... 4-12 4-17. Making Calibration Adjustments..................................................... 4-16 4-18. Exiting the Calibration Mode........................................................... 4-17 4-19. Setting the Minimum Contrast Level................................................... 4-18 ii Contents (continued) 5 Troubleshooting................................................................................. 5-1 5-1. Introduction.......................................................................................... 5-3 5-2. General Troubleshooting...................................................................... 5-3 5-3. Starting with a Dead Tester (Model 41B Only)............................... 5-3 5-4. Troubleshooting the Power Supply...................................................... 5-5 5-5. Troubleshooting the Digital Section..................................................... 5-5 5-6. Troubleshooting the Digital Kernel................................................. 5-6 5-7. Troubleshooting the A/D Converter Output..................................... 5-7 5-8. Troubleshooting the Keypad............................................................ 5-9 5-9. Troubleshooting the Range Control Circuit..................................... 5-10 5-10. Troubleshooting the EEPROM........................................................ 5-11 5-11. Troubleshooting the LCD Display Module...................................... 5-12 5-12. Troubleshooting the Serial EEPROM.............................................. 5-13 6 List of Replaceable Parts................................................................... 6-1 6-1. Introduction.......................................................................................... 6-3 6-2. How to Obtain Parts............................................................................. 6-3 6-3. Manual Status Information................................................................... 6-3 6-4. Newer Instruments................................................................................ 6-4 6-5. Parts Lists............................................................................................. 6-4 7 Schematic Diagrams.......................................................................... 7-1 iii 39/41B Service Manual iv List of Tables Table Title Page 2-1. Voltage Gains........................................................................................................ 2-9 2-2. Current Gains......................................................................................................... 2-9 2-3. Memory Map......................................................................................................... 2-11 2-4. Logic Truth Table.................................................................................................. 2-12 4-1. Recommended Test Equipment............................................................................. 4-3 4-2. Volts Performance................................................................................................. 4-5 4-3. Amps Performance................................................................................................ 4-7 4-4. Watts Performance, Line Frequency...................................................................... 4-8 4-5. Harmonics Performance for Volts......................................................................... 4-10 4-6. Harmonics Performance for Amps........................................................................ 4-11 5-1. Power Supply Current Limits................................................................................ 5-5 5-2. Power Supplies...................................................................................................... 5-5 5-3. Latch Signals for Voltage Ranges.......................................................................... 5-10 6-1. Fluke 39 Final Assembly....................................................................................... 6-5 6-2. Fluke 39 A1 Main PCA......................................................................................... 6-7 6-3. Fluke 41B Final Assembly..................................................................................... 6-13 6-4. Fluke 41B A1 Main PCA....................................................................................... 6-16 v 39/41B Service Manual vi List of Figures Figure Title Page 2-1. Overall Functional Block Diagram........................................................................ 2-4 2-2. PLD Block Diagram.............................................................................................. 2-11 3-1. Removing the Case Bottom................................................................................... 3-5 3-2. Flex Cable Connector............................................................................................ 3-6 4-1. Watts Performance Test Configuration................................................................. 4-6 4-2. Battery Removal.................................................................................................... 4-13 4-3. Battery Spring Adjustment.................................................................................... 4-14 4-4. Calibration Access Hole........................................................................................ 4-15 5-1. Test Point Locator.................................................................................................. 5-4 6-1. Fluke 39 Final Assembly....................................................................................... 6-6 6-2. Fluke 39 A1 Main PCA......................................................................................... 6-11 6-3. Fluke 41B Final Assembly..................................................................................... 6-15 6-4. Fluke 41B A1 Main PCA....................................................................................... 6-20 vii 39/41B Service Manual viii