FLUKE 40/41

1 PN 942826 June 1994 1994 FLUKE Corporation, Inc. All right . ni detnirP .devreser s FLUKE 40/41 POWER HARMONICS METER/ANALYZER Service ManualFluke 40/41 Service ManualLIMITED WARRANTY & LIMITATION OF LIABILITYEach FLUKE product is warranted to be free from defects in material and workmanship under normaluse and service. The warranty period is one year and begins on the date of shipment. Parts, productrepairs and services are warranted for 90 days. This warranty extends only to the original buyer orend-user customer of a FLUKE authorized reseller, and does not apply to fuses, disposable batteries orto any product which, in FLUKE 's opinion, has been misused, altered, neglected or damaged by acci-dent or abnormal conditions of operation or handling. FLUKE warrants that software will operate sub-stantially in accordance with its functional specifications for 90 days and that it has been properlyrecorded on non-defective media.

2 FLUKE does not warrant that software will be error free or operatewithout authorized resellers shall extend this warranty on new and unused products to end-user cus-tomers only but have no authority to extend a greater or different warranty on behalf of FLUKE . War-ranty support is available if product is purchased through a FLUKE authorized sales outlet or Buyer haspaid the applicable international price. FLUKE reserves the right to invoice Buyer for importation costsof repair/replacement parts when product purchased in one country is submitted for repair in 's warranty obligation is limited, at FLUKE 's option, to refund of the purchase price, free ofcharge repair, or replacement of a defective product which is returned to a FLUKE authorized servicecenter within the warranty obtain warranty service, contact your nearest FLUKE authorized service center or send the product,with a description of the difficulty, postage and insurance prepaid (FOB Destination), to the nearestFluke authorized service center.

3 FLUKE assumes no risk for damage in transit. Following warrantyrepair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Flukedetermines that the failure was caused by misuse, alteration, accident or abnormal condition of op-eration or handling, FLUKE will provide an estimate of repair costs and obtain authorization beforecommencing the work. Following repair, the product will be returned to the Buyer transportationprepaid and the Buyer will be billed for the repair and return transportation charges (FOB ShippingPoint).THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALLOTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANYIMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PUR-POSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL ORCONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, WHETHER ARIS-ING FROM BREACH OF WARRANTY OR BASED ON CONTRACT, TORT, RELIANCE ORANY OTHER some countries or states do not allow limitation of the term of an implied warranty, or exclu-sion or limitation of incidental or consequential damages, the limitations and exclusions of this war-ranty may not apply to every buyer.

4 If any provision of this Warranty is held invalid or unenforce-able by a court of competent jurisdiction, such holding will not affect the validity or enforceability ofany other CorporationFluke Europe Box Box 1186 Everett WA 98206-90905602 NetherlandsiTable of ContentsCHAPTERPAGE1 INTRODUCTION AND 1-11-1. 1-11-2. ORGANIZATION OF THE SERVICE 1-11-3. 1-21-4. GENERAL 1-21-5. 1-21-6. Power 1-31-7. Options, Accessories and Related 1-31-8. Operating 1-31-9. 1-42 THEORY OF OPERATION .. 2-12-1. 2-12-2. FUNCTIONAL BLOCK 2-12-3. CIRCUIT 2-32-4. Power-Up 2-32-5. Normal 2-42-6. CIRCUIT 2-42-7. Power 2-42-17. Input 2-62-24. A/D 2-72-25. Digital 2-82-37.

5 2-112-38. 2-112-42. Optical Interface (Model 41 Only).. 2-123 GENERAL 3-13-1. 3-13-2. WARRANTY REPAIRS AND SHIPPING 3-13-3. GENERAL MAINTENANCE 3-13-4. Required 3-1 FLUKE 40/41 Service Manualii3-5. Static-Safe 3-13-6. 3-23-7. DISASSEMBLING THE 3-23-8. Removing the Meter Case 3-33-9. Removing the PCA and Input 3-43-10. Removing the LCD 3-53-11. Removing the Elastomeric 3-53-12. REASSEMBLING THE 3-53-13. Installing the PCA and Input 3-53-14. Reassembling the Case 3-54 PERFORMANCE TESTING AND 4-14-1. 4-14-2. REQUIRED 4-14-3. PERFORMANCE 4-14-4. Warming-Up the 4-14-5. Checking the Display 4-14-6. Testing Voltage 4-24-7. Testing Amps 4-34-8.

6 Testing Watts, VA, VAR 4-54-9. Testing Record Mode 4-64-10. Testing Memory Mode Performance (Model 41 Only).. 4-64-11. Testing Harmonics Volts 4-64-12. Testing Harmonics Amps 4-84-13. Testing Serial I/O Performance (Model 41 Only).. 4-94-14. CALIBRATING THE 4-94-15. 4-94-16. Entering Calibration 4-104-17. Making Calibration 5-15-1. 5-15-2. GENERAL 5-15-3. Starting with a Dead 5-15-4. TROUBLESHOOTING THE POWER 5-35-5. TROUBLESHOOTING THE DIGITAL 5-35-6. Troubleshooting the Digital 5-35-7. Troubleshooting the A/D Converter 5-55-8. Troubleshooting the 5-75-9. Troubleshooting the Range Control 5-85-10. Troubleshooting the 5-85-11. Troubleshooting the LCD Display 5-95-12. Troubleshooting the Serial 5-116 LIST OF REPLACEABLE PARTS .. 6-16-1. 6-26-2. HOW TO OBTAIN 6-26-3.

7 MANUAL STATUS 6-2 Contents(continued)iii6-4. NEWER 6-36-5. SERVICE CENTERS .. 6-36-6. PARTS 6-37 SCHEMATIC 7-1 FLUKE 40/41 Service ManualivvList of Truth Test Performance, Text Performance, Text Performance, Text Performance for Volts, Harmonics Performance for AMPS, Harmonics Supply Current Signals for Voltage 40 Final 40 A1 Main 41 Final 41 A1 Main 6-13 FLUKE 40/41 Service ManualviviiList of FiguresFIGURE Functional Block Block Diagram .. the Case Cable Performance Test Spring Access Point 40 Final 40 A1 Main 41 Final 41 A1 Main 6-16 FLUKE 40/41 Service Manualviii 1-1 Chapter 1 Introduction and Specifications Title Page 1-1.

8 1-3 1-2. Organization of the Service Manual .. 1-3 1-3. Conventions .. 1-4 1-4. General 1-4 1-5. Description .. 1-4 1-6. Power 1-4 1-7. Options, Accessories and Related Equipment .. 1-4 1-8. Operating Instructions .. 1-5 1-9. 1-6 39/41B Service Manual 1-2 Introduction and Specifications Introduction 1 1-3 Introduction 1-1. This service manual provides information on maintaining, troubleshooting, and repairing the FLUKE 40 Power Harmonics Meter and FLUKE 41 Power Harmonics Analyzer.

9 The information in this manual pertains to both models unless otherwise indicated. The FLUKE 40 and 41 share many features and are collectively referred to as the Tester . Model 41 is mentioned when a description pertains to that model only. This manual includes the following: Specifications Theory of operation Calibration procedure Performance testing and troubleshooting procedures Replacement parts lists 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. If the warranty has expired, the meter will be repaired and returned for a fixed fee. Contact the nearest Service Center for information and prices. A list of and International Service Centers is included at the end of Chapter 6 of this manual. Organization of the Service Manual 1-2. This service manual has the following chapters. Chapter Error!

10 Reference source not Introduction and Specifications Chapter Error! Reference source not found. describes the Service Manual, explains special terminology and conventions, and provides complete meter specifications. Chapter Error! Reference source not Error! Reference source not found. Chapter Error! Reference source not found. treats the Tester s circuitry as functional blocks, with a description of each block s role in overall operation. A detailed circuit description is then given for each block. These descriptions explain operation to the component level and support the troubleshooting and repair procedures in Chapter 5. Chapter Error! Reference source not Error! Reference source not found. Chapter Error! Reference source not found. provides information on general maintenance, handling precautions and disassembly instructions. Instructions covering warranty repairs and shipping the instrument to a service center are also contained in this section.