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Fluke 2635A, 2625A service manual 2620A-1601

Models: 2635A 2625A

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HYDRA

Service Manual

2620A-1601

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Figure 6-3. 2620A/2625A A1 Main PCA

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Fluke 2635A, 2625A service manual 2620A-1601

Contents

Hydra Limited Warranty & Limitation of Liability Interference Information Page Safety Summary Do Not Operate in Explosive Atmospheres Table of Contents Hydra General Maintenance Performance Testing and Calibration Diagnostic Testing and Troubleshooting 2635A 5A-1 Schematic Diagrams Hydra Starter Calibration Software List of Tables 5A-19 List of Figures 5A-10 Introduction and Specifications Hydra Operating Instructions Options and AccessoriesIntroduction Theory of Operation 2635A IEEE-488 Option 2620A only Schematic Diagrams ConventionsHydra Features Model SpecificationsAccessories Description Normal Mode Rejection A/2625A SpecificationsDC Voltage Inputs Resolution Range Common Mode Rejection100.00 Wire Accuracy A/2625A Specifications Thermocouple Inputs Input ImpedanceCommon Mode and Normal Mode Rejection Maximum Open Circuit Voltage Maximum Sensor Temperature0C to 60C Slow Fast Using Channel Crest Factor Error Input at Upper FrequencyDC Component Error Maximum Crest FactorTypical Full Maximum Current Scale Voltage Through Unknown A/2625A Specifications Ohms Input RangeResolution Slow Fast Input ProtectionSlow Fast Typical Scanning RateFunction Range Channels Trigger Inputs Totalizing InputsDigital Inputs Environmental A/2625A Specifications Digital and Alarm OutputsReal-Time Clock and Calendar GeneralRS-232-C 2625A Data StorageAC Signal Crosstalk into an AC Voltage Channel A/2625A Specifications 2620A Options IEEE-488 Option -05KAC Signal Crosstalk in a DC Voltage Channel TypicalAC Signal Crosstalk into a Temperature Channel Type Worst case TypicalA Specifications DC Voltage Inputs Resolution Range Slow FastA Specifications Input Impedance Days Slow Year Slow Year Fast Introduction and Specifications A Specifications Thermocouple Inputs Input Impedance 300 mV 10 μV 100 μV 30V 10 mV 150/300V 100 mV Maximum Crest Factor A Specifications Ohms Input Range Typical Scanning Rate Function Range Channels Totalizing Inputs A Specifications Digital and Alarm Outputs TX, RX, DTR, DSR, RTS, CTS, GND Hydra Theory of Operation 2620A/2625A Totalizer Input External Trigger Input Circuits Introduction Interconnect Diagram Theory of Operation 2620A/2625A Functional Block Description A/D Converter PCA Detailed Circuit Description Power Supply Circuit Description Inverter Power Fail Detection Microprocessor Memory Map Hexadecimal Address Device SelectedDisplay/Keyboard Interface Eeprom Digital I/O Digital Input Threshold 49. A/D Converter PCA Input Protection Analog SimplifiedPin Name Analog Measurement Processor Pin DescriptionsFunction Relays Analog Measurement Processor Pin Descriptions NameA3K15 Function Relay States Relay Position A3K17A3K16 Input HI Ohms Simplified Schematic AC Volts A3Z3 Divider Resistors AC Volts Input Signal Dividers RangeDrive Signal Overall Gain59. A/D Converter Inguard Microcontroller Circuitry Input Connector PCA Main PCA Connector Display Display Controller Power-Up Display Initialization Display Initialization ModesAddress Decoding IEEE-488 Interface Option Theory of Operation 2635A 2A-49 2A-2. Functional Block Description 2A-4. Power Supply2A-1. Introduction 2A-3. Main PCA Circuitry2A-4 Functional Block Description 2A-8. A/D Converter PCA 2A-19. Display PCA 2A-16. Input Connector Assembly2A-21. Detailed Circuit Description 2A-20. Memory Card Interface PCA2A-23.Power Supply Circuit Description 2A-24.Raw DC Supply2A-27.Inverter 2A-29.Inverter Inguard Supply 2A-31.Digital Kernel2A-33.Microprocessor Signal Name 1. Microprocessor Interrupt Sources 2635A Pin2A-34.Address Decoding 2A-35.Flash Eprom 2A-37.Serial Communication Guard Crossing 2A-38.Display/Keyboard Interface Clock Dividers 2A-40.RS-232 Interface 2A-43.Digital Input Threshold 2A-45.Digital and Alarm Output Drivers2A-42.Digital I/O 2A-44.Digital Input Buffers2A-49.Analog Measurement Processor 2A-47.External Trigger Input Circuits2A-48. A/D Converter PCA 2A-21 2A-22 2A-23 2A-50.Input Protection 4. Analog Measurement Processor Pin Descriptions 2635A Name2A-51.Input Signal Conditioning 5. Function Relay States 2635A Relay Position A3K172A-54.Ohms and RTDs 2A-27 2A-55.AC Volts 6. AC Buffer Simplified Schematic 2635A 6. AC Volts Input Signal Dividers 2635A Range2A-57.Passive and Active Filters 2A-58.A/D Converter2A-31 2A-61.Open Thermocouple Check 2A-59.Inguard Microcontroller Circuitry2A-60.Channel Selection Circuitry Power Supply A2J1 Pins Nominal Voltage 2A-62. Input Connector PCA2A-64.Main PCA Connector 2A-63. Display PCA2A-67.Beeper Drive Circuit 2A-65.Front Panel Switches2A-66.Display 2A-68.Watchdog Timer and Reset Circuit 2A-69.Display Controller8. Display Initialization Modes 2635A 9. Grid Control Signal Timing 2635A 2A-70. Memory Card Interface PCA2A-73.Memory Card Controller 2A-71.Main PCA Connector2A-72.Microprocessor Interface 2A-74.PCMCIA Memory Card Connector 2A-40 Static awareness Dow Chemical General Maintenance Install the Handle and Mounting Brackets Power Requirements Warranty Repairs and ShippingGeneral Maintenance Required EquipmentCleaning Servicing Surface-Mount AssembliesLine Fuse Replacement Disassembly ProceduresRemove Handle and Mounting Brackets Remove the Front Panel AssemblyRemove the Instrument Case Remove the Display PCADisassembly Procedures Removing the Handle and Handle Mounting Brackets A and 2625A Assembly Details A Assembly Details Remove the Memory Card I/F PCA 2635A Only Remove the IEEE-488 Option 2620A OnlyRemove the Memory PCA 2625A Only Remove the Main PCA Remove the A/D Converter PCAInstall the A/D Converter PCA Assembly ProceduresInstall Miscellaneous Chassis Components Disconnect Miscellaneous Chassis ComponentsInstall the Memory PCA 2625A Only Install the Main PCAInstall the IEEE-488 Option 2620A Only Install the Front Panel Assembly Install the Memory Card I/F PCA 2635A OnlyAssemble the Front Panel Assembly Install the Handle and Mounting BracketsHydra Performance Testing and Calibration Hydra Instrument Type Recommended Test Equipment Minimum SpecificationsIntroduction Required Equipment Recommended ModelChannel Integrity Test Performance TestsAccuracy Verification Test Performance Tests Voltage, Resistance, and Frequency Year, 18-28CThermocouple Measurement Range Accuracy Test Function Range Input LevelTerminal Resistance Test Func 0,VDC,I100MV CR MON 1,0 CR MONVAL? CRThermocouple Temperature Accuracy Test Input Module11 12 13 14 15 16 17 18 19 11 12 13 14 15 16 17 18 19 3 4 5 6 7 8 9Negative Lead Material Thermocouple Information Type Positive Lead MaterialPositive Lead Color Usable RangeRTD Temperature Accuracy Test Open Thermocouple Response TestTemperature Accuracy Specifications Year @ 18-28C RTD Temperature Accuracy Test Using DIN/IECSimulated C Temperature 2620A/2635A Digital Input/Output Verification Tests Digital Output TestTerminal Grounded Digital Input TestTotalizer Test Digital Input Values State of Digital InputsTotalizer Sensitivity Test Dedicated Alarm Output Test 2 3 4 5 6 7 Σ + 0 1 2 3 TR 5700ACalibration External Trigger Input TestPerformance Testing and Calibration Command Using Hydra Starter Calibration SoftwareSetup Procedure Using Starter Calibration Mode Computer Interface Commands DescriptionCalibration Procedure Using Starter Calibration Procedure Using a Terminal Using a TerminalSetup Procedure Using a Terminal Response DC Volts Calibration ActionReference Junction Calibration 10. AC Volts Calibration ActionConcluding Calibration Terminal Connections to Decade Resistance SourceHydra Input Module 11 -Wire Ohms Calibration Fixed Resistor Command Updating 2635A Data Bucket Embedded Instrument FirmwareUsing the PC Compatible Firmware Loader Software 12 -Wire Ohms Calibration 5700A Command13. Frequency Calibration Command Setup Procedure for Firmware DownloadDefault Instrument Firmware Download Procedure Using LD2635 Firmware Loader Directly Diagnostic Testing and Troubleshooting 2620A/2625A Failure to Detect Memory PCA Failure to Store Data Servicing Surface-Mount Assemblies Error Codes Each error code is displayed for 2 secondsError Error Codes Description General Troubleshooting Procedures Preregulated Power SuppliesTest Point Locator, Main PCA A1 Volt Switching Supply Power Supply TroubleshootingPower Fail Detection Raw DC SupplyVolt Switching Supply InverterHydra FET Gate Signal Analog Troubleshooting Power Supply Test Location Acceptable RangePower Supply Troubleshooting Guide Symptom FaultTest Point Pulses Test Points, A/D Converter PCA A3, A3U9 A3U9 MicrocontrollerDC Volts HI Troubleshooting Checkpoint DC Volts TroubleshootingAC Volts Troubleshooting Signal DescriptionOhms HI Troubleshooting Checkpoint Ohms TroubleshootingAC Volts HI Troubleshooting Checkpoint Ohms Open-Circuit Voltage RangeDigital Kernel Troubleshooting Microprocessor Timing Totalizer Troubleshooting Digital and Alarm Output TroubleshootingDigital Input Troubleshooting Test Points, Display PCA A2 Display Assembly Troubleshooting Review Variations in the Display Calibration-Related Components Calibration FailuresIntroduction AC Volts 1 kHz OhmsRetrieving Calibration Constants Replacing the Eeprom A1U1Power-Up Problems IEEE-488 Interface PCA A5 TroubleshootingMemory PCA A6 Troubleshooting Failure to Detect Memory PCAHydra Diagnostic Testing and Troubleshooting 2635A Failure to Detect Insertion of Memory Card 5A-1. Introduction 5A-2. Servicing Surface-Mount Assemblies5A-3. Error Codes Error 1. Error Codes 2635A Description2. Preregulated Power Supplies 2635A Preregulated Voltage 5A-4. General Troubleshooting Procedures1. Error Codes 2635A Measurement PointsGeneral Troubleshooting Procedures 5A-8 -Volt Switching Supply 5A-5. Power Supply Troubleshooting5A-7. Power Fail Detection 5A-6. Raw DC Supply2 -Volt Switching Supply 2635A 5A-9. Inverter5A-10 5A-10. Analog Troubleshooting 3. Power Supply Troubleshooting Guide 2635A Symptom Power Supply Nearest Component Acceptable Range 5A-14 5A-15 5A-11. DC Volts Troubleshooting 6. Integrator Output 2635A4. DC Volts HI Troubleshooting 2635A Checkpoint 5A-12. AC Volts Troubleshooting5A-13. Ohms Troubleshooting 5. AC Volts HI Troubleshooting 2635A Checkpoint6. Ohms Open-Circuit Voltage 2635A Range 5A-14. Digital Kernel TroubleshootingVoltage 7. Ohms HI Troubleshooting 2635A Checkpoint Output A12 A11 A10 5A-20 5A-15. Digital and Alarm Output Troubleshooting 5A-16. Digital Input Troubleshooting5A-22 5A-17. Totalizer Troubleshooting 5A-18. Display Assembly Troubleshooting5A-24 9. Display Controller to Microprocessor Signals 2635A 10. Display Test Pattern #1 2635A5A-19. Variations in the Display 5A-22. Calibration-Related Components 5A-20. Calibration Failures5A-21. Introduction 5A-28 5A-23. Retrieving Calibration Constants 5A-24. Replacing the Flash Memory A1U14 and A1U165A-27. Failure to Detect Memory Card I/F PCA 5A-25. Memory Card I/F PCA A6 Troubleshooting5A-26. Power-Up Problems Battery LED 5A-29. Failure to Power Card / Illuminate the Busy Led5A-30. Failure to Illuminate the Battery Led 5A-28. Failure to Detect Insertion of Memory Card5A-31. Failure to Write to Memory Card 5A-32. Write/Read Memory Card Test DestructiveMemory card test passed without detecting any errors 5A-34 List of Replaceable Parts Hydra How to Obtain Parts Manual Status InformationRevision Service CentersNewer Instruments List of Replaceable Parts Service Centers A/2625A Final AssemblyTM1 TM2 TM3 TM4 TM5 TM6 2620A/2625A T&B Bottom View Top View S58f.eps A Final Assembly TM1 TM2 TM3 TM4 TM5 2635A T&B Part of W2 MP102 H52 Cable Assembly T1 Ref H52 S62f.eps A/2625A A1 Main PCA CR5,CR6Reference Description Designator VR1 VR2 VR3 VR4 2620A-1601 A A1 Main PCA CAP,AL,10UF,+-20%,63V,SOLV ProoofMP101 Q1-3,Q10 Q4-6 Q7,Q8 R1,R11,R12 R22,R25,R45 INDUCTOR,FXD,DUAL,EE24-25,0.4MH,1.2A 2635A-1601 WIRE,JUMPER,TEF,22AWG,WHT,.300 A2 Display PCACKT A3 A/D Converter PCA Reference Description Designator Fluke Stock Tot QtyReference Description Fluke Stock Designator K3, K5-K14 Relay Polarity A4 Analog Input PCA Reference Description Fluke Stock Tot Qty Designator2620A-1604 A5 Option -05 IEEE-488 Interface PCA A5 IEEE-488 Interface PCA Option A A6 Memory PCA 2625A-1606 10 a A6 Memory Card I/F PCA 2635A-1606 Hydra IEEE-488 Option Hydra Functional Block Description Theory of OperationIEEE-488 PCA Detailed Circuit Description 2620A Only Main PCA Connector IEEE-488 ControllerIEEE-488 Transceiver Control IEEE-488 Transceivers/ConnectorRemoving the IEEE-488 Option Installation Performance Testing Installing the IEEE-488 OptionFailure to Select IEEE-488 Option TroubleshootingCommunication Problems Failure to Handshake on IEEE-488 BusSchematic Diagram List of Replaceable PartsHydra Schematic Diagrams Hydra Schematic Diagrams Power Supply PIN Numbers DES RAW Supply 2620A-1001 U S E D Reference Designations Lasted Used Not Used A1 Main PCA 2635A2635A-1001 2635A-1001 2635A-1001 Control External Trigger Totalizer Inputs CKT 2620A-1002 S91c.eps 2620A-1003 S82c.eps S83c.eps S92f.eps 2620A-1004 A5 IEEE-488 Interface PCA 2620A Only 1V dc A6 Memory PCA 2625A A6U1 A6U2 A6U3 A6U4 A6U5 A6U6 A6U7 A6U8 2625A-1006 Reference Designations Lasted Used Not Used 0V dc2635A-1006 Schematic Diagrams