®5725AAmplifierInstruction ManualPN 823435January 1989Rev. 7, 6/02© 1993, 1996, 2002 Fluke Corporation, All rights reserved. Printed in U.S.A.All prod
5725AInstruction Manualviii
5725AInstruction Manual4-30to approximately 33Ω/°C by R615. Op amp U603A provides a reference voltage ofabout -0.77V. This reference voltage is applie
Theory of OperationDetailed Circuit Description44-31aq21f.epsFigure 4-5. High Voltage Sense Assembly Block Diagram
5725AInstruction Manual4-32• Serial Interface/Guard Crossing SectionThe serial interface/guard crossing section consists of an RS-232 interface integ
Theory of OperationDetailed Circuit Description44-33VR105 reduce apparent supply voltage seen by U102. Transistors Q105 and Q106 alongwith R131/C117 a
5725AInstruction Manual4-34latch up by eliminating positive feedback resulting from positive output voltages fromU100. Op amp U105 is simply a low-noi
Theory of OperationDetailed Circuit Description44-35IC U156 is a dac whose digital input is under microprocessor control via data latchU155. The +15V
5725AInstruction Manual4-36Relays K102 and K103 provide switching that allows direct drive of the sense amplifierand its calibration circuitry by the
Theory of OperationDetailed Circuit Description44-374-60. AC Line Voltage Selection SectionIn addition to the primary power switch, S401, this sectio
5725AInstruction Manual4-38
5-1Chapter 5Calibration and VerificationTitle Page5-1. Introduction...
Interference InformationThis equipment generates and uses radio frequency energy and if not installed and used in strictaccordance with the manufactur
5725AInstruction Manual5-2
Calibration and VerificationIntroduction55-35-1. IntroductionThe 5725A is calibrated at the factory before shipping. Calibration is traceable to theU.
5725AInstruction Manual5-4
Some semiconductors and custom IC's can bedamaged by electrostatic discharge duringhandling. This notice explains how you canminimize the chances
5. USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT.6. DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE.7. AVOID PLASTIC,VINYL AND STYROFOAM
6-1Chapter 6MaintenanceTitle Page6-1. Introduction ... 6-36-2.
5725AInstruction Manual6-2
MaintenanceIntroduction66-3WarningServicing described in this section is to be done by qualifiedservice personnel only. To avoid electrical shock, do
5725AInstruction Manual6-4100V110V115V120VS2 S3 S4VOLTAGESELECTIONFUSEF8A 250V(FAST)200V220V230V240VS2 S3 S4F4A 250V(FAST)JOHN FLUKE MFG. CO., INC.MAD
MaintenanceGeneral Cleaning66-5aq14f.epsFigure 6-2. Accessing the Air Filter6-4. General CleaningTo keep the 5725A looking like new, clean the case, f
5725AInstruction Manual6-66-6. Access ProceduresFigure 6-3 shows the location of all major modules in the 5725A. View A is a top view,and view B is a
MaintenanceAccess Procedures66-7WarningFollow the instructions under "Initial Access Procedure" tomake sure high voltage has been bled off b
5725AInstruction Manual6-8CURRENT MODE5725A STANDBYFAULTOVERLOADCABLE OFFPOWER11AMAX2OVPKMAXLEDCR317TP301FRONT PANELTP307TP304LEDCR318HIGH VOLTAGEAMPL
MaintenanceAccess Procedures66-98. Take another DMM reading with the common lead to TP307 and the high lead toTP304 on the Power Supply assembly. Thi
5725AInstruction Manual6-10 CAUTIONWHEN REINSTALLING DIGITAL ASSEMBLY,PULL RIBBON CABLE SLACK COMPLETELYINTO CHASSIS. aq17
MaintenanceAccess Procedures66-114. If you want to completely remove the Digital assembly, remove the ribbon cable byreleasing the catches on the boa
5725AInstruction Manual6-12CURRENTAMPLIFIER(A2)BRIDGERECTIFIERHEAT SINKDRESS CABLESAS SHOWNaq18f.epsFigure 6-6. Correct Way to Dress Cables6-11. Acce
MaintenanceAccess Procedures66-136-12. Accessing the High Voltage Sense Assembly (A6)WarningTo avoid electrical shock, do not proceed with the follow
5725AInstruction Manual6-146-13. Accessing the High Voltage Output TransistorsWarningDuring normal operation, the high voltage heat sinks are atletha
MaintenanceEnabling Front or Rear Binding Posts66-156. Turn over the 5725A so that the top is facing up.7. Remove the high voltage heat sink assembl
OPERATOR SAFETYSUMMARYWARNINGHIGH VOLTAGEis used in the operation of this equipmentLETHAL VOLTAGEmay be present on the terminals, observe all safety p
5725AInstruction Manual6-16J222FRONT OUTPUTCABLEREAR OUTPUTCABLECURRENTAMPLIFIER(A2)SECURE UNUSEDCABLEaq23f.epsFigure 6-7. Enabling Front or Rear Bind
7-1Chapter 7TroubleshootingTitle Page7-1. Introduction ... 7-37
5725AInstruction Manual7-2
TroubleshootingIntroduction77-37-1. IntroductionThis section provides troubleshooting information in three parts. First a listing of all5725A fault co
5725AInstruction Manual7-4Table 7-1. 5725A Fault CodesFAULTNO.MESSAGE EXPLANATION201 5725 Self-Test ROM Failure Requires service202 5725 Self-Test RAM
TroubleshootingSelf Diagnostics77-5Table 7-1. 5725A Fault Codes (cont)FAULTNO.MESSAGE EXPLANATION228 5725 Software TRAP 229 5725 Cable Was Off 230 5
5725AInstruction Manual7-67-4. Manual Tests for Fault IsolationWarningThe following servicing is to be done by qualified servicepersonnel only. To av
TroubleshootingManual Tests for Fault Isolation77-77-5. Problems 1 or 2: Fault at Power-Up or When Entering VoltageStandbyProceed as follows to isola
5725AInstruction Manual7-87-6. Problem 3: Fault When Entering Voltage OperateProceed as follows to isolate the problem in this condition:1. Suspect
TroubleshootingTesting the Power Supply By Itself77-93. Remove plug P301 from J301 and inserting it into J303. Now the high voltage powersupply will
Symbols Marked on EquipmentDANGER — High VoltageProtective ground (earth) terminalAttention — refer to the manual. This symbol indicates that informat
5725AInstruction Manual7-10
8-1Chapter 8List of Replaceable PartsTitle Page8-1. Introduction...
5725AInstruction Manual8-2
List of Replaceable PartsIntroduction88-38-1. IntroductionThis chapter contains an illustrated list of replaceable parts for the 7-300, 7-600, 12B, an
5725AInstruction Manual8-4Note This instrument may contain a Nickel-Cadmium battery. Do not mix withthe sold waste stream. Spent batteries should be d
List of Replaceable PartsParts Lists88-5Table 8-2. Final Assembly (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesH437 SCREW,PH,P,LOCK,S
5725AInstruction Manual8-6Table 8-2. Final Assembly (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesTM1 5725 INSTRUCTION MANUAL 823435 1
List of Replaceable PartsParts Lists88-7aq24f.tifFigure 8-1. Final Assembly
5725AInstruction Manual8-8aq25f.tifFigure 8-1. Final Assembly (cont)
List of Replaceable PartsParts Lists88-9aq26f.tifFigure 8-1. Final Assembly (cont)
SERVICING SAFETYSUMMARYFOR QUALIFIED SERVICEPERSONNEL ONLYAlso refer to the preceding Operator Safety SummaryDo Not Service AloneDo not perform intern
5725AInstruction Manual8-10aq27f.tifFigure 8-1. Final Assembly (cont)
List of Replaceable PartsParts Lists88-11aq28f.tifFigure 8-1. Final Assembly (cont)
5725AInstruction Manual8-12aq29f.tifFigure 8-1. Final Assembly (cont)
List of Replaceable PartsParts Lists88-13aq30f.tifFigure 8-1. Final Assembly (cont)
5725AInstruction Manual8-14aq31f.tifFigure 8-1. Final Assembly (cont)
List of Replaceable PartsParts Lists88-15Table 8-3. A1 Interconnect PCAReferenceDesignatorDescriptionFluke StockNoTot Qty NotesCR1,CR13-15 * DIODE,SI,
5725AInstruction Manual8-165725A-1611aq36f.epsFigure 8-2. A1 Interconnect PCA
List of Replaceable PartsParts Lists88-17Table 8-4. A2 Current Amplifier PCAReferenceDesignatorDescriptionFluke StockNoTot Qty NotesC201,C202,C207,C20
5725AInstruction Manual8-18Table 8-4. A2 Current Amplifier PCA (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesMP2 INSULATOR, CURRENT 85
List of Replaceable PartsParts Lists88-19Table 8-4. A2 Current Amplifier PCA (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesR233,R237,R
FIRST AID FORELECTRIC SHOCKFree the Victim From the Live ConductorShut off high voltage at once and ground the circuit. If high voltage cannot be turn
5725AInstruction Manual8-205725A-1650aq37f.epsFigure 8-3. A2 Current Amplifier PCA
List of Replaceable PartsParts Lists88-21Table 8-5. A3 High Voltage Amplifier PCAReferenceDesignatorDescriptionFluke StockNoTot Qty NotesC601 CAP,POLY
5725AInstruction Manual8-22Table 8-5. A3 High Voltage Amplifier PCA (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesQ601 * TRANSISTOR,SI
List of Replaceable PartsParts Lists88-23Table 8-5. A3 High Voltage Amplifier PCA (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesR640,R
5725AInstruction Manual8-245725A-1661aq38f.epsFigure 8-4. A3 High Voltage Amplifier PCA
List of Replaceable PartsParts Lists88-25Table 8-6. A4 Power Supply PCAReferenceDesignatorDescriptionFluke StockNoTot Qty NotesC301,C302,C321,C322CAP,
5725AInstruction Manual8-26Table 8-6. A4 Power Supply PCA (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesMP310 AIDE,PCB PULL 541730 2MP
List of Replaceable PartsParts Lists88-27Table 8-6. A4 Power Supply PCA (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesR351 RES,CF,1K,+
5725AInstruction Manual8-285725A-1631aq39f.epsFigure 8-5. A4 Power Supply PCA
List of Replaceable PartsParts Lists88-29Table 8-7. A5 Digital PCAReferenceDesignatorDescriptionFluke StockNoTot Qty NotesC501,C503-511,C516,C518,C519
1-1Chapter 1Introduction and SpecificationsTitle Page1-1. Introduction ...
5725AInstruction Manual8-305725A-1650aq40f.epsFigure 8-6. A5 Digital PCA
List of Replaceable PartsParts Lists88-31Table 8-8. A6 High Voltage Sense PCAReferenceDesignatorDescriptionFluke StockNoTot Qty NotesC98,C99 CAP,CER,4
5725AInstruction Manual8-32Table 8-8. A6 High Voltage Sense PCA (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesJ403 HEADER,1 ROW,.156CT
List of Replaceable PartsParts Lists88-33Table 8-8. A6 High Voltage Sense PCA (cont)ReferenceDesignatorDescriptionFluke StockNoTot Qty NotesR154 RES,M
5725AInstruction Manual8-345725A-1601aq41f.epsFigure 8-7. A6 High Voltage Sense PCA
List of Replaceable PartsParts Lists88-35Table 8-9. A12 Transformer Enclosure AssemblyReferenceDesignatorDescriptionFluke StockNoTot Qty NotesH1 SCREW
5725AInstruction Manual8-36aq32f.tifFigure 8-8. A12 Transformer Enclosure Assembly
List of Replaceable PartsParts Lists88-37aq33f.tifFigure 8-8. A12 Transformer Enclosure Assembly (cont)
5725AInstruction Manual8-38aq34f.tifFigure 8-8. A12 Transformer Enclosure Assembly (cont)
List of Replaceable PartsParts Lists88-39aq35f.tifFigure 8-8. A12 Transformer Enclosure Assembly (cont)
5725AInstruction Manual1-2
5725AInstruction Manual8-40Table 8-10. A30 Inductor PCAReferenceDesignatorDescriptionFluke StockNoTot Qty NotesJ1 CONN,MATE-N-LOK,HEADER,4 PIN 512269
9-1Chapter 9Schematic DiagramsFigure No. Title Page9-1. A1 Interconnect PCA... 9-
5725AInstruction Manual9-2
Schematic Diagrams9-39Figure 9-1. A1 Interconnect PCA5725A-1611aq48f.eps
5725AInstruction Manual9-4Figure 9-1. A1 Interconnect PCA (cont)
Schematic Diagrams9-59Figure 9-1. A1 Interconnect PCA (cont)
5725AInstruction Manual9-6Figure 9-2. A2 Current Amplifier PCA5725A-1650aq52f.eps
Schematic Diagrams9-79Figure 9-2. A2 Current Amplifier PCA (cont)
5725AInstruction Manual9-8Figure 9-2. A2 Current Amplifier PCA (cont)
Schematic Diagrams9-99Figure 9-2. A2 Current Amplifier PCA (cont)
Introduction and SpecificationsIntroduction11-31-1. IntroductionThe Fluke 5725A Amplifier enhances the 5700A Calibrator in the ac voltage, ac current,
5725AInstruction Manual9-10Figure 9-3. A3 High Voltage Amplifier PCA5725A-1661aq56f.eps
Schematic Diagrams9-119Figure 9-3. A3 High Voltage Amplifier PCA (cont)
5725AInstruction Manual9-12Figure 9-3. A3 High Voltage Amplifier PCA (cont)
Schematic Diagrams9-139Figure 9-4. A4 Power Supply PCA5725A-1631aq59f.eps
5725AInstruction Manual9-14Figure 9-4. A4 Power Supply PCA (cont)
Schematic Diagrams9-159Figure 9-4. A4 Power Supply PCA (cont)
5725AInstruction Manual9-16Figure 9-5. A5 Digital PCAaq62f.eps5725A-1650aq43f.eps100901002 V10 msTYPICAL COMMUNICATIONS ACTIVITYAT PINS 12 AND 13 OF U
Schematic Diagrams9-179Figure 9-5. A5 Digital PCA (cont)
5725AInstruction Manual9-18Figure 9-6. A6 High Voltage Sense PCA100901001 V10 ms100901001 V10 msVOLTAGE STANDBYSTANDBY100901001 V10 msCURRENT STANDBYA
Schematic Diagrams9-199Figure 9-6. A6 High Voltage Sense PCA (cont)
LIMITED WARRANTY AND LIMITATION OF LIABILITYEach Fluke product is warranted to be free from defects in material and workmanship under normal use andse
5725AInstruction Manual1-41-2. Where to Go From HereThis manual is the operator and service manual for the 5725A. However, because the5725A operates
5725AInstruction Manual9-20Figure 9-6. A6 High Voltage Sense PCA (cont)
Schematic Diagrams9-219Figure 9-6. A6 High Voltage Sense PCA (cont)
5725AInstruction Manual9-22Figure 9-6. A6 High Voltage Sense PCA (cont)
Schematic Diagrams99-23aq45f.epsFigure 9-7. A12 Transformer Enclosure Assembly
5725AInstruction Manual9-24
1Index—5—5700ACALIBRATOR connector, 2-6, 3-7Connecting to, 2-65725A STANDBY indicator, 3-5—A—A1. See Interconnect assemblyA2. See Current Amplifier as
5725AInstruction Manual2PCAs, 6-5Clearance requirements, 2-5Communication, 5700A and 5725A, 4-8Connectors, (also see binding posts, Terminals), 3-5570
Index (continued)3POWER switch, 3-5Problems, 2-5, 7-3—R—Rack mounting, 2-5Rear panel features, 3-6Remote control, 3-3Replacing the fuse, 6-3—S—Selecti
5725AInstruction Manual4
Introduction and SpecificationsHow to Use the Manuals11-51-3. How to Use the ManualsThe following paragraphs describe how each manual addresses the 5
5725AInstruction Manual1-61-9. 5700A/5720A Series II Remote Programming Reference GuideThe 5700A/5720A Series II Remote Programming Reference Guide c
Introduction and SpecificationsDC Voltage Specifications11-71-12. DC Voltage SpecificationsTable 1-1. 5720A Series II DC Voltage Specifications: 99 %
5725AInstruction Manual1-8Table 1-2. 5700A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels5700A99% 99 % Confidence LevelRange Re
Introduction and SpecificationsDC Voltage Specifications11-9Table 1-3. DC Voltage Secondary Performance Specifications and Operating CharacteristicsTe
5725AInstruction Manual1-101-13. AC Voltage SpecificationsTable 1-4. 5720A Series II AC Voltage Specifications: 99 % Confidence Level5720A99% 99 % Co
Introduction and SpecificationsAC Voltage Specifications11-11Table 1-5. 5720A Series II AC Voltage Specifications: 95 % Confidence Level5720A95% 95 %
5725AInstruction Manual1-12Table 1-6. 5700A Series II AC Voltage Specifications: 99 % Confidence Level5700A99% 99 % Confidence LevelRange Resolution
Introduction and SpecificationsAC Voltage Specifications11-13Table 1-7. 5700A Series II AC Voltage Specifications: 95 % Confidence Level5700A95% 95%
iTable of ContentsChapter Title Page1 Introduction and Specifications... 1-11-1. Introduction ...
5725AInstruction Manual1-14Table 1-8. AC Voltage Secondary Performance Specifications and Operating CharacteristicsStability± 1 °C [Note 1]Temperatur
Introduction and SpecificationsAC Voltage Specifications11-15Table 1-8. AC Voltage Secondary Performance and Operating Characteristics (continued)5725
5725AInstruction Manual1-161-14. Resistance SpecificationsTable 1-9. 5720A Series II Resistance Specifications: 99 % and 95 % Confidence Levels5720A99
Introduction and SpecificationsResistance Specifications11-17Table 1-10. 5700A Series II Resistance Specifications: 99 % and 95 % Confidence Levels570
5725AInstruction Manual1-18Table 1-11. Resistance Secondary Performance Specifications and Operating CharacteristicsNominalValueStability ±1 °C[Note 1
Introduction and SpecificationsResistance Specifications11-19Table 1-12. Current Derating FactorsNominal Value Value of Derating Factor K for Over or
5725AInstruction Manual1-201-15. DC Current SpecificationsTable 1-13. 5720A Series II DC Current Specifications: 99 % and 95 % Confidence Levels5720A9
Introduction and SpecificationsDC Current Specifications11-21Table 1-14. 5700A Series II DC Current Specifications: 99 % and 95 % Confidence Levels570
5725AInstruction Manual1-22Table 1-15. DC Current Secondary Performance Specifications and Operating CharacteristicsTemperatureCoefficient [Note 2]Noi
Introduction and SpecificationsAC Current Specifications11-231-16. AC Current SpecificationsTable 1-16. 5720A Series II AC Current Specifications: 99
5725AInstruction Manualii3-3. Rear Panel Features... 3-63-4. Turning on the
5725AInstruction Manual1-24Table 1-17. 5720A Series II AC Current Specifications: 95 % Confidence Level5720A95% 95 % Confidence LevelRange Resolution
Introduction and SpecificationsAC Current Specifications11-25Table 1-18. 5700A Series II AC Current Specifications: 99 % Confidence Level5700A99% 99
5725AInstruction Manual1-26Table 1-19. 5700A Series II AC Current Specifications: 95 % Confidence Level5700A95% 95 % Confidence LevelRange Resolution
Introduction and SpecificationsAC Current Specifications11-27Table 1-20. AC Current Secondary Performance Specifications and Operating Characteristics
5725AInstruction Manual1-281-17. Wideband AC Voltage (Option 5700-03) SpecificationsTable 1-21. Wideband AC Voltage (Option 5700-03) SpecificationsSpe
Introduction and SpecificationsGeneral Specifications11-291-18. General SpecificationsWarm-Up Time: Twice the time since last warmed up, to a maximum
5725AInstruction Manual1-301-19. Auxiliary Amplifier SpecificationsFor complete specifications, see the 5205A and 5220A Operators Manuals.5205A (220V
2-1Chapter 2InstallationTitle Page2-1. Introduction ... 2-32-2.
5725AInstruction Manual2-2
InstallationIntroduction22-3WarningThe 5725A amplifier is capable of supplying lethal voltages. Donot touch the 5700A output terminals. Read this sect
Contents (continued)iii4-43. Window Comparator ... 4-264-44. Input Clamp ...
5725AInstruction Manual2-4Table 2-2. Line Power Cord Types Available from FlukeTYPE VOLTAGE/CURRENT FLUKE OPTION NUMBERNorth America 120V/15A LC-1Nort
InstallationService Information22-52-3. Service InformationEach 5725A Amplifier is warranted to the original purchaser for a period of one yearbeginni
5725AInstruction Manual2-62-6. Connecting to the 5700A CalibratorProceed as follows to connect the 5725A to the 5700A:1. Turn the power off for both
InstallationSelecting Line Voltage22-72-7. Selecting Line VoltageThe 5725A arrives from the factory configured for the line voltage normally appropri
5725AInstruction Manual2-82-8. Accessing the FuseCautionTo prevent instrument damage, verify that the correct fuse isinstalled for the line voltage s
InstallationConnecting to Line Power22-92-9. Connecting to Line PowerWarningTo avoid shock hazard, connect the factory-supplied, three-conductor line
5725AInstruction Manual2-10
3-1Chapter 3Operating NotesTitle Page3-1. Introduction ... 3-33
5725AInstruction Manual3-2
Operating NotesIntroduction33-33-1. IntroductionThis section provides setup and operation information for the 5725A Amplifier. Thissection begins with
5725AInstruction Manualiv8 List of Replaceable Parts ... 8-18-1. Introduction ...
5725AInstruction Manual3-43-2. Front Panel FeaturesFront panel features are called out in Figure 3-1. Each front panel feature is described inTable 3
Operating NotesRear Panel Features33-5Table 3-1. Front Panel FeaturesA CURRENT OUTPUT Binding PostsThe source of all amplified current if the 5725A i
5725AInstruction Manual3-63-3. Rear Panel FeaturesRear panel features are called out in Figure 3-2. Each rear panel feature is brieflydescribed in Ta
Operating NotesTurning on the 5725A Amplifier33-7Table 3-2. Rear Panel FeaturesA CURRENT OUTPUT Binding PostsThe source of all amplified current if t
5725AInstruction Manual3-83-4. Turning on the 5725A AmplifierWarningTo avoid electric shock, make sure the 5725A is safelygrounded as described in se
Operating Notes5725A Operating Functions and Modes33-93-6. 5725A Operating Functions and ModesWarningBoth the 5700A and 5725A can produce fatal volta
5725AInstruction Manual3-103-8. Voltage StandbyNOOUTPUTCURRENTOUTPUTHILOVOLTAGE MODECURRENT MODE5725A STANDBYFAULTOVERLOADCABLE OFF11AMAX2OVPKMAXNO OU
Operating Notes5725A Operating Functions and Modes33-113-9. Current StandbyCURRENTOUTPUTHILOVOLTAGE MODECURRENT MODE5725A STANDBYFAULTOVERLOADCABLE OF
5725AInstruction Manual3-123-10. Voltage OperateCURRENTOUTPUTHILOVOLTAGE MODECURRENT MODE5725A STANDBYFAULTOVERLOADCABLE OFF11AMAX2OVPKMAXNO OUTPUTHI
Operating NotesConditions That Activate the 5725A33-133-11. Current OperateCURRENTOUTPUTHILOVOLTAGE MODECURRENT MODE5725A STANDBYFAULTOVERLOADCABLE O
vList of TablesTable Title Page1-1. 5720A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 1-71-2. 5700A Series II DC Voltage Spec
5725AInstruction Manual3-143-12. Conditions That Activate the 5725AWhen the 5725A is connected to the 5700A, and is selected as the amplifier for thea
4-1Chapter 4Theory of OperationTitle Page4-1. Introduction ...
5725AInstruction Manual4-24-30. Optoisolator Link... 4-184-31. Break-Detect Circ
Theory of OperationIntroduction44-34-1. IntroductionThis section presents theory of operation in increasing level of detail. The 5725AAmplifier is fir
5725AInstruction Manual4-4Figure 4-1. 5725A Overall Block Diagram
Theory of OperationOverall Functional Description44-5• 11A DC Function:The 11A dc function is implemented with a transconductance (voltage in/current
5725AInstruction Manual4-6The 5700A/5725A system uses the following method for ac amplitude control:1. An rms thermal sensor alternately measures two
Theory of OperationOverall Functional Description44-74-5. Operation in the 11A DC RangeFor the dc current function, the 5700A is configured for the d
5725AInstruction Manual4-84-10. How the 5700A and 5725A CommunicateThe 5725A and 5700A maintain all analog and digital communication over an external
Theory of OperationOverall Functional Description44-94-12. Description of the In-Guard LinesThe following list describes the 11 5725A in-guard lines:
5725AInstruction Manualvi7-2. Analog Monitor Faults... 7-78-1.
5725AInstruction Manual4-10Inside the 5725A, B-SENSE LO is buffered by the 5725A, with the equivalentvoltage called MCOM.• B-FEEDBACKDuring ac voltag
Theory of OperationDetailed Circuit Description44-11• High Voltage Power Amplifier Assembly (A3)• Power amplifier• Harness to heat sink and its hig
5725AInstruction Manual4-124-16. Power Supply Assembly (A4)The Power Supply assembly (A4) provides regulated system supplies for all 5725Aassemblies
Theory of OperationDetailed Circuit Description44-134-17. High Voltage Supply SectionThe high voltage supply allows normal operation from a pair of n
5725AInstruction Manual4-144-18. Switching SectionMOSFETs Q301/Q317 and Q302/Q318 (each in parallel) are series-switch elements forthe +400V supply. S
Theory of OperationDetailed Circuit Description44-154-19. Current-Limit SectionResistors R313 and R329 are current shunts for the high voltage supplie
5725AInstruction Manual4-164-21. Fan Supply SectionThe fan supply uses the same transformer secondary windings as the ±15 and ±20Vsupplies. Its own f
Theory of OperationDetailed Circuit Description44-17aq19f.epsFigure 4-2. Digital Assembly Block Diagram
5725AInstruction Manual4-184-26. EEROMA 2Kb X 8 EEROM (U512) stores 5725A calibration constants plus the date andtemperature of calibration. If the re
Theory of OperationDetailed Circuit Description44-194-31. Break-Detect CircuitryThe 6303Y divides the 4.9152-MHz crystal frequency by four to create
viiList of FiguresFigure Title Page1-1. Volt-Hertz Capability...
5725AInstruction Manual4-20aq20f.epsFigure 4-3. Current Amplifier Assembly Block Diagram
Theory of OperationDetailed Circuit Description44-21• Error Amplifier SectionThe error amplifier section contains three differential amplifiers and a
5725AInstruction Manual4-22(ICAL, TP208) with the same amplitude and polarity as the current amplifier input voltage.The calibration amplifier output
Theory of OperationDetailed Circuit Description44-234-38. Control and Switching SectionRefer to page 2 of the Current Amplifier schematic. Relays K20
5725AInstruction Manual4-244-40. High Voltage Amplifier (A3)The High Voltage Amplifier assembly, operating with the step-up signal transformers,const
Theory of OperationDetailed Circuit Description44-25aq22f.epsFigure 4-4. High Voltage Amplifier Assembly Block Diagram
5725AInstruction Manual4-264-42. IntegratorOp amp U601A is configured as an integrator to reduce the output offset of the inputamplifier circuit. This
Theory of OperationDetailed Circuit Description44-274-45. Transconductance and Cascode StageThe output voltage of the input amplifier U602, LVAMP, is
5725AInstruction Manual4-28compensate for the capacitance seen at the gates of the power MOSFETs on the #1 heatsink assemblies. Their sources establis
Theory of OperationDetailed Circuit Description44-29Op amp U606B senses the -400V supply and forces the autobias to the minimum biascondition when the
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