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Fluke 2625A, 2635A service manual 2620A-1604

Models: 2635A 2625A

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List of Replaceable Parts	6
Service Centers

2620A-1604

s67f.eps

Figure 6-7. A4 Analog Input PCA

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Fluke 2625A, 2635A service manual 2620A-1604

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 Introduction Options and AccessoriesOperating Instructions Theory of Operation 2635A Conventions IEEE-488 Option 2620A only Schematic DiagramsHydra Features Accessories Description SpecificationsModel DC Voltage Inputs Resolution Range A/2625A SpecificationsNormal Mode Rejection Common Mode Rejection100.00 Common Mode and Normal Mode Rejection A/2625A Specifications Thermocouple Inputs Input ImpedanceWire Accuracy Maximum Open Circuit Voltage Maximum Sensor Temperature0C to 60C Slow Fast DC Component Error Crest Factor Error Input at Upper FrequencyUsing Channel Maximum Crest FactorResolution Slow Fast A/2625A Specifications Ohms Input RangeTypical Full Maximum Current Scale Voltage Through Unknown Input ProtectionFunction Range Channels Typical Scanning RateSlow Fast Digital Inputs Totalizing InputsTrigger Inputs Real-Time Clock and Calendar A/2625A Specifications Digital and Alarm OutputsEnvironmental General2625A Data Storage RS-232-CAC Signal Crosstalk in a DC Voltage Channel A/2625A Specifications 2620A Options IEEE-488 Option -05KAC Signal Crosstalk into an AC Voltage Channel TypicalType Worst case Typical AC Signal Crosstalk into a Temperature ChannelDC Voltage Inputs Resolution Range Slow Fast A SpecificationsA 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 Device Selected Microprocessor Memory Map Hexadecimal AddressDisplay/Keyboard Interface Eeprom Digital I/O Digital Input Threshold 49. A/D Converter PCA Input Protection Simplified AnalogAnalog Measurement Processor Pin Descriptions Pin NameAnalog Measurement Processor Pin Descriptions Name Function RelaysA3K16 Function Relay States Relay Position A3K17A3K15 Input HI Ohms Simplified Schematic AC Volts Drive Signal AC Volts Input Signal Dividers RangeA3Z3 Divider Resistors Overall Gain59. A/D Converter Inguard Microcontroller Circuitry Input Connector PCA Main PCA Connector Display Display Controller Display Initialization Modes Power-Up Display InitializationAddress Decoding IEEE-488 Interface Option Theory of Operation 2635A 2A-49 2A-1. Introduction 2A-4. Power Supply2A-2. Functional Block Description 2A-3. Main PCA Circuitry2A-4 Functional Block Description 2A-8. A/D Converter PCA 2A-21. Detailed Circuit Description 2A-16. Input Connector Assembly2A-19. Display PCA 2A-20. Memory Card Interface PCA2A-24.Raw DC Supply 2A-23.Power Supply Circuit Description2A-27.Inverter 2A-31.Digital Kernel 2A-29.Inverter Inguard Supply2A-33.Microprocessor 1. Microprocessor Interrupt Sources 2635A Pin Signal Name2A-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-42.Digital I/O 2A-45.Digital and Alarm Output Drivers2A-43.Digital Input Threshold 2A-44.Digital Input Buffers2A-48. A/D Converter PCA 2A-47.External Trigger Input Circuits2A-49.Analog Measurement Processor 2A-21 2A-22 2A-23 4. Analog Measurement Processor Pin Descriptions 2635A Name 2A-50.Input Protection5. Function Relay States 2635A Relay Position A3K17 2A-51.Input Signal Conditioning2A-54.Ohms and RTDs 2A-27 2A-55.AC Volts 6. AC Volts Input Signal Dividers 2635A Range 6. AC Buffer Simplified Schematic 2635A2A-58.A/D Converter 2A-57.Passive and Active Filters2A-31 2A-60.Channel Selection Circuitry 2A-59.Inguard Microcontroller Circuitry2A-61.Open Thermocouple Check 2A-64.Main PCA Connector 2A-62. Input Connector PCAPower Supply A2J1 Pins Nominal Voltage 2A-63. Display PCA2A-66.Display 2A-65.Front Panel Switches2A-67.Beeper Drive Circuit 2A-69.Display Controller 2A-68.Watchdog Timer and Reset Circuit8. Display Initialization Modes 2635A 2A-70. Memory Card Interface PCA 9. Grid Control Signal Timing 2635A2A-72.Microprocessor Interface 2A-71.Main PCA Connector2A-73.Memory Card Controller 2A-74.PCMCIA Memory Card Connector 2A-40 Static awareness Dow Chemical General Maintenance Install the Handle and Mounting Brackets General Maintenance Warranty Repairs and ShippingPower Requirements Required EquipmentServicing Surface-Mount Assemblies CleaningDisassembly Procedures Line Fuse ReplacementRemove the Instrument Case Remove the Front Panel AssemblyRemove Handle and Mounting Brackets Remove the Display PCADisassembly Procedures Removing the Handle and Handle Mounting Brackets A and 2625A Assembly Details A Assembly Details Remove the Memory PCA 2625A Only Remove the IEEE-488 Option 2620A OnlyRemove the Memory Card I/F PCA 2635A Only Remove the A/D Converter PCA Remove the Main PCAInstall Miscellaneous Chassis Components Assembly ProceduresInstall the A/D Converter PCA Disconnect Miscellaneous Chassis ComponentsInstall the IEEE-488 Option 2620A Only Install the Main PCAInstall the Memory PCA 2625A Only Assemble the Front Panel Assembly Install the Memory Card I/F PCA 2635A OnlyInstall the Front Panel Assembly Install the Handle and Mounting BracketsHydra Performance Testing and Calibration Hydra Introduction Required Equipment Recommended Test Equipment Minimum SpecificationsInstrument Type Recommended ModelAccuracy Verification Test Performance TestsChannel Integrity Test Year, 18-28C Performance Tests Voltage, Resistance, and FrequencyFunction Range Input Level Thermocouple Measurement Range Accuracy TestFunc 0,VDC,I100MV CR MON 1,0 CR MONVAL? CR Terminal Resistance TestInput Module Thermocouple Temperature Accuracy Test11 12 13 14 15 16 17 18 19 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19Positive Lead Color Thermocouple Information Type Positive Lead MaterialNegative Lead Material Usable RangeOpen Thermocouple Response Test RTD Temperature Accuracy TestSimulated C Temperature 2620A/2635A RTD Temperature Accuracy Test Using DIN/IECTemperature Accuracy Specifications Year @ 18-28C Digital Output Test Digital Input/Output Verification TestsTotalizer Test Digital Input TestTerminal Grounded Digital Input Values State of Digital InputsTotalizer Sensitivity Test Dedicated Alarm Output Test 5700A 2 3 4 5 6 7 Σ + 0 1 2 3 TRExternal Trigger Input Test CalibrationPerformance Testing and Calibration Setup Procedure Using Starter Using Hydra Starter Calibration SoftwareCommand Calibration Mode Computer Interface Commands DescriptionCalibration Procedure Using Starter Setup Procedure Using a Terminal Using a TerminalCalibration Procedure Using a Terminal DC Volts Calibration Action Response10. AC Volts Calibration Action Reference Junction CalibrationTerminal Connections to Decade Resistance Source Concluding CalibrationHydra Input Module Updating 2635A Data Bucket Embedded Instrument Firmware 11 -Wire Ohms Calibration Fixed Resistor Command12 -Wire Ohms Calibration 5700A Command Using the PC Compatible Firmware Loader SoftwareDefault Instrument Firmware Download Procedure Setup Procedure for Firmware Download13. Frequency Calibration Command Using LD2635 Firmware Loader Directly Diagnostic Testing and Troubleshooting 2620A/2625A Failure to Detect Memory PCA Failure to Store Data Servicing Surface-Mount Assemblies Each error code is displayed for 2 seconds Error CodesError Error Codes Description Preregulated Power Supplies General Troubleshooting ProceduresTest Point Locator, Main PCA A1 Power Fail Detection Power Supply TroubleshootingVolt Switching Supply Raw DC SupplyInverter Volt Switching SupplyHydra FET Gate Signal Power Supply Test Location Acceptable Range Analog TroubleshootingFault Power Supply Troubleshooting Guide SymptomTest Point Pulses Test Points, A/D Converter PCA A3, A3U9 Microcontroller A3U9AC Volts Troubleshooting DC Volts TroubleshootingDC Volts HI Troubleshooting Checkpoint Signal DescriptionAC Volts HI Troubleshooting Checkpoint Ohms TroubleshootingOhms HI Troubleshooting Checkpoint Ohms Open-Circuit Voltage RangeDigital Kernel Troubleshooting Microprocessor Timing Digital Input Troubleshooting Digital and Alarm Output TroubleshootingTotalizer Troubleshooting Test Points, Display PCA A2 Display Assembly Troubleshooting Review Variations in the Display Introduction Calibration FailuresCalibration-Related Components Ohms AC Volts 1 kHzReplacing the Eeprom A1U1 Retrieving Calibration ConstantsMemory PCA A6 Troubleshooting IEEE-488 Interface PCA A5 TroubleshootingPower-Up Problems Failure to Detect Memory PCAHydra Diagnostic Testing and Troubleshooting 2635A Failure to Detect Insertion of Memory Card 5A-2. Servicing Surface-Mount Assemblies 5A-1. Introduction5A-3. Error Codes 1. Error Codes 2635A Description Error1. Error Codes 2635A 5A-4. General Troubleshooting Procedures2. Preregulated Power Supplies 2635A Preregulated Voltage Measurement PointsGeneral Troubleshooting Procedures 5A-7. Power Fail Detection 5A-5. Power Supply Troubleshooting5A-8 -Volt Switching Supply 5A-6. Raw DC Supply5A-9. Inverter 2 -Volt Switching Supply 2635A5A-10 5A-10. Analog Troubleshooting 3. Power Supply Troubleshooting Guide 2635A Symptom Power Supply Nearest Component Acceptable Range 5A-14 5A-15 6. Integrator Output 2635A 5A-11. DC Volts Troubleshooting5A-13. Ohms Troubleshooting 5A-12. AC Volts Troubleshooting4. DC Volts HI Troubleshooting 2635A Checkpoint 5. AC Volts HI Troubleshooting 2635A CheckpointVoltage 7. Ohms HI Troubleshooting 2635A Checkpoint 5A-14. Digital Kernel Troubleshooting6. Ohms Open-Circuit Voltage 2635A Range Output A12 A11 A10 5A-20 5A-16. Digital Input Troubleshooting 5A-15. Digital and Alarm Output Troubleshooting5A-22 5A-18. Display Assembly Troubleshooting 5A-17. Totalizer Troubleshooting5A-24 10. Display Test Pattern #1 2635A 9. Display Controller to Microprocessor Signals 2635A5A-19. Variations in the Display 5A-21. Introduction 5A-20. Calibration Failures5A-22. Calibration-Related Components 5A-28 5A-24. Replacing the Flash Memory A1U14 and A1U16 5A-23. Retrieving Calibration Constants5A-26. Power-Up Problems 5A-25. Memory Card I/F PCA A6 Troubleshooting5A-27. Failure to Detect Memory Card I/F PCA 5A-30. Failure to Illuminate the Battery Led 5A-29. Failure to Power Card / Illuminate the Busy LedBattery LED 5A-28. Failure to Detect Insertion of Memory Card5A-32. Write/Read Memory Card Test Destructive 5A-31. Failure to Write to Memory CardMemory card test passed without detecting any errors 5A-34 List of Replaceable Parts Hydra Manual Status Information How to Obtain PartsNewer Instruments Service CentersRevision A/2625A Final Assembly List of Replaceable Parts Service CentersTM1 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 CR5,CR6 A/2625A A1 Main PCAReference Description Designator VR1 VR2 VR3 VR4 2620A-1601 CAP,AL,10UF,+-20%,63V,SOLV Prooof A A1 Main PCAMP101 Q1-3,Q10 Q4-6 Q7,Q8 R1,R11,R12 R22,R25,R45 INDUCTOR,FXD,DUAL,EE24-25,0.4MH,1.2A 2635A-1601 A2 Display PCA WIRE,JUMPER,TEF,22AWG,WHT,.300CKT Reference Description Designator Fluke Stock Tot Qty A3 A/D Converter PCAReference Description Fluke Stock Designator K3, K5-K14 Relay Polarity Reference Description Fluke Stock Tot Qty Designator A4 Analog Input PCA2620A-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 IEEE-488 PCA Detailed Circuit Description 2620A Only Theory of OperationFunctional Block Description IEEE-488 Controller Main PCA ConnectorRemoving the IEEE-488 Option IEEE-488 Transceivers/ConnectorIEEE-488 Transceiver Control Installation Installing the IEEE-488 Option Performance TestingCommunication Problems TroubleshootingFailure to Select IEEE-488 Option Failure to Handshake on IEEE-488 BusList of Replaceable Parts Schematic DiagramHydra Schematic Diagrams Hydra Schematic Diagrams Power Supply PIN Numbers DES RAW Supply 2620A-1001 U S E D A1 Main PCA 2635A Reference Designations Lasted Used Not Used2635A-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 Lasted Used Not Used 0V dc Reference Designations2635A-1006 Schematic Diagrams