Manuals / Fluke / Computer Equipment / Power Supply

Fluke 2625A, 2635A service manual 2620A-1003

Models: 2635A 2625A

1 310

Download 310 pages 12.8 Kb

Page 299

Schematic Diagrams 8

	POWER SUPPLY PIN NUMBERS
REF
REF	VCC	VSS	ANALOG_GND	VDDR	RCOM
DES	(5.3V dc)	(5.4V dc)	ANALOG_GND	(5.6V dc)
DES	(5.3V dc)	(5.4V dc)		(5.6V dc)

A3U1	3	--	10, 11, 12	--	--
A3U2	1, 16	8	6, 9	--	--
A3U3	1, 10, 11,	--	2, 7	--	--
--	12, 13, 14	--	--	--	--
A3U4	--	--	--	9	8
A3U5	--	--	--	9	8
A3U6	--	--	1, 3, 4	--	--
A3U7	--	--	3	--	--
A3U8	1	44	4, 25, 27, 38	--	--
A3U9	5, 6, 9, 36	--	2, 45	--	--
A3U10	--	--	--	9	8
A3U11	--	--	--	9	8
A3U12	--	--	--	9	8
A3U13	8	--	4	--	--
A3U14	8	4	--	--	--
A3Z1	--	--	4	--	--
A3Z2	1	--	--	--	--
A3Z3	--	--	8	--	--

2620A-1003

(1 of 3)

s81c.eps

Figure 8-4. A3 A/D Converter PCA (cont)

8-17

Image 299

Fluke 2625A, 2635A service manual 2620A-1003

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 Conventions IEEE-488 Option 2620A only Schematic DiagramsHydra Features Model SpecificationsAccessories Description Common Mode Rejection A/2625A SpecificationsDC Voltage Inputs Resolution Range Normal Mode Rejection100.00 Maximum Open Circuit Voltage Maximum Sensor Temperature A/2625A Specifications Thermocouple Inputs Input ImpedanceCommon Mode and Normal Mode Rejection Wire Accuracy0C to 60C Slow Fast Maximum Crest Factor Crest Factor Error Input at Upper FrequencyDC Component Error Using ChannelInput Protection A/2625A Specifications Ohms Input RangeResolution Slow Fast Typical Full Maximum Current Scale Voltage Through UnknownSlow Fast Typical Scanning RateFunction Range Channels Trigger Inputs Totalizing InputsDigital Inputs General A/2625A Specifications Digital and Alarm OutputsReal-Time Clock and Calendar Environmental2625A Data Storage RS-232-CTypical A/2625A Specifications 2620A Options IEEE-488 Option -05KAC Signal Crosstalk in a DC Voltage Channel AC Signal Crosstalk into an AC Voltage ChannelType 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 RelaysA3K15 Function Relay States Relay Position A3K17A3K16 Input HI Ohms Simplified Schematic AC Volts Overall Gain AC Volts Input Signal Dividers RangeDrive Signal A3Z3 Divider Resistors59. 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-3. Main PCA Circuitry 2A-4. Power Supply2A-1. Introduction 2A-2. Functional Block Description2A-4 Functional Block Description 2A-8. A/D Converter PCA 2A-20. Memory Card Interface PCA 2A-16. Input Connector Assembly2A-21. Detailed Circuit Description 2A-19. Display 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-44.Digital Input Buffers 2A-45.Digital and Alarm Output Drivers2A-42.Digital I/O 2A-43.Digital Input Threshold2A-49.Analog Measurement Processor 2A-47.External Trigger Input Circuits2A-48. A/D Converter PCA 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-61.Open Thermocouple Check 2A-59.Inguard Microcontroller Circuitry2A-60.Channel Selection Circuitry 2A-63. Display PCA 2A-62. Input Connector PCA2A-64.Main PCA Connector Power Supply A2J1 Pins Nominal Voltage2A-67.Beeper Drive Circuit 2A-65.Front Panel Switches2A-66.Display 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-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 Required Equipment Warranty Repairs and ShippingGeneral Maintenance Power RequirementsServicing Surface-Mount Assemblies CleaningDisassembly Procedures Line Fuse ReplacementRemove the Display PCA Remove the Front Panel AssemblyRemove the Instrument Case Remove Handle and Mounting BracketsDisassembly 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 A/D Converter PCA Remove the Main PCADisconnect Miscellaneous Chassis Components Assembly ProceduresInstall Miscellaneous Chassis Components Install the A/D Converter PCAInstall the Memory PCA 2625A Only Install the Main PCAInstall the IEEE-488 Option 2620A Only Install the Handle and Mounting Brackets Install the Memory Card I/F PCA 2635A OnlyAssemble the Front Panel Assembly Install the Front Panel AssemblyHydra Performance Testing and Calibration Hydra Recommended Model Recommended Test Equipment Minimum SpecificationsIntroduction Required Equipment Instrument TypeChannel Integrity Test Performance TestsAccuracy Verification 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 19Usable Range Thermocouple Information Type Positive Lead MaterialPositive Lead Color Negative Lead MaterialOpen Thermocouple Response Test RTD Temperature Accuracy TestTemperature Accuracy Specifications Year @ 18-28C RTD Temperature Accuracy Test Using DIN/IECSimulated C Temperature 2620A/2635A Digital Output Test Digital Input/Output Verification TestsDigital Input Values State of Digital Inputs Digital Input TestTotalizer Test Terminal GroundedTotalizer 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 Calibration Mode Computer Interface Commands Description Using Hydra Starter Calibration SoftwareSetup Procedure Using Starter CommandCalibration Procedure Using Starter Calibration Procedure Using a Terminal Using a TerminalSetup 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 Software13. 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 Each error code is displayed for 2 seconds Error CodesError Error Codes Description Preregulated Power Supplies General Troubleshooting ProceduresTest Point Locator, Main PCA A1 Raw DC Supply Power Supply TroubleshootingPower Fail Detection Volt Switching 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 A3U9Signal Description DC Volts TroubleshootingAC Volts Troubleshooting DC Volts HI Troubleshooting CheckpointOhms Open-Circuit Voltage Range Ohms TroubleshootingAC Volts HI Troubleshooting Checkpoint Ohms HI Troubleshooting CheckpointDigital 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 Ohms AC Volts 1 kHzReplacing the Eeprom A1U1 Retrieving Calibration ConstantsFailure to Detect Memory PCA IEEE-488 Interface PCA A5 TroubleshootingMemory PCA A6 Troubleshooting Power-Up ProblemsHydra 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 ErrorMeasurement Points 5A-4. General Troubleshooting Procedures1. Error Codes 2635A 2. Preregulated Power Supplies 2635A Preregulated VoltageGeneral Troubleshooting Procedures 5A-6. Raw DC Supply 5A-5. Power Supply Troubleshooting5A-7. Power Fail Detection 5A-8 -Volt Switching 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 Troubleshooting5. AC Volts HI Troubleshooting 2635A Checkpoint 5A-12. AC Volts Troubleshooting5A-13. Ohms Troubleshooting 4. DC 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-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-22. Calibration-Related Components 5A-20. Calibration Failures5A-21. Introduction 5A-28 5A-24. Replacing the Flash Memory A1U14 and A1U16 5A-23. Retrieving Calibration Constants5A-27. Failure to Detect Memory Card I/F PCA 5A-25. Memory Card I/F PCA A6 Troubleshooting5A-26. Power-Up Problems 5A-28. Failure to Detect Insertion of Memory Card 5A-29. Failure to Power Card / Illuminate the Busy Led5A-30. Failure to Illuminate the Battery Led Battery LED5A-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 PartsRevision Service CentersNewer Instruments 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 Functional Block Description Theory of OperationIEEE-488 PCA Detailed Circuit Description 2620A Only IEEE-488 Controller Main PCA ConnectorIEEE-488 Transceiver Control IEEE-488 Transceivers/ConnectorRemoving the IEEE-488 Option Installation Installing the IEEE-488 Option Performance TestingFailure to Handshake on IEEE-488 Bus TroubleshootingCommunication Problems Failure to Select IEEE-488 OptionList 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