User ManualTable of Contents5700A/5720A Series II Service Manual1LIMITED WARRANTY & LIMITATION OF LIABILITY2Interference Information3OPERATOR SAFETY SUMMARY5Terms in this Manual5Symbols Marked on Equipment6Power Source6Use the Proper Fuse6Grounding the 5700A Series II or 5720A Series II6Use the Proper Power Cord6Do Not Operate in Explosive Atmospheres6Do Not Remove Cover6SERVICING SAFETY SUMMARY7Do Not Service Alone7Use Care When Servicing With Power On7FIRST AID FOR ELECTRIC SHOCK8Free the Victim From the Live Conductor8Get Help!8Never Accept Ordinary and General Tests for Death8Treat the Victim8Table of Contents9List of Tables17List of Figures211. Introduction and Specifications25Introduction27Contacting Fluke28About this Manual28How to Use this Manual28Additional Instruction Manuals29Wideband AC Voltage Module (Option 5700A-03)29Auxiliary Amplifiers305725A Amplifier30Support Equipment and Services30732B Direct Voltage Reference Standard31732B-200 Direct Volt Maintenance Program (U.S.A. Only)31742A Series Resistance Standards31Wideband AC Module (Option 5700A-03) Calibration Support31Service Centers32The Components of the 5700A/5720A Series II Calibrator32Calibrating the 5700A/5720A Series II Calibrator33The Calibration Process34Establishing Traceability34Calibration Reports35Calibration Check35Developing a Performance History35Range Calibration36DC Zeros Calibration36Specifications36Specification Confidence Levels36Using Absolute and Relative Uncertainty Specifications36Using Secondary Performance Specifications37DC Voltage Specifications38AC Voltage Specifications41Resistance Specifications47DC Current Specifications51AC Current Specifications54Wideband AC Voltage (Option 5700-03) Specifications59General Specifications602. Theory of Operation63Introduction67Calibrator Overview67Internal References67Hybrid Reference Amplifiers67Fluke Thermal Sensor (FTS).67Digital-to-Analog Converter (DAC).68Digital Section Overview68Analog Section Overview68Functional Description Presented by Output Function70DC Voltage Functional Description70AC Voltage Functional Description73Wideband AC V Functional Description (Option -03)74DC Current Functional Description74AC Current Functional Description74Ohms Functional Description75System Interconnect Detailed Circuit Description75Digital Motherboard Assembly (A4)75Transformer Assembly (A22)76Analog Motherboard Assembly (A3)76Front/Rear Binding Posts80Rear Panel Assembly (A21)80Filter PA Supply Assembly (A18)80Digital Section Detailed Circuit Description80Digital Power Supply Assembly (A19)80+5V Power Supply81±12V Power Supplies81+35V Power Supply81+75V Power Supply82+35V and +75V Shut-Down Circuit82CPU (Central Processing Unit) Assembly (A20)82Power-Up and Reset Circuit83Clock Generation83Front Panel Assembly (A2)90Keyboard Assembly (A1)94Analog Section Detailed Circuit Description95Filter/PA Supply (A18), Low-voltage Filter/Regulator Section95Filter/PA Supply (A18), Power Amplifier Output Supply Section97Regulator/Guard Crossing Assembly (A17)100Voltage Regulator Circuitry100Regulated OSC Supplies100Regulated LH Supplies101Regulated S Supplies101FR1 Supply102FR2 Supply102Guarded Digital Control Circuitry103Switch Matrix Assembly (A8)105Switch Matrix Digital Control106Switch Matrix Operation: 11V DC and 22V DC Ranges108Switch Matrix Operation: 2.2V AC and 22V AC Ranges110Switch Matrix Operation: 220V AC and DC Ranges110Switch Matrix Operation: 2.2V DC Range113Calibration of the 2.2V Range115Switch Matrix Operation: 220 mV DC Range115Switch Matrix Operation: 220 mV AC Range118Switch Matrix Operation: 2.2 mV and 22 mV AC Ranges118Calibration of the mV Ranges118Internal CAL Zero Amplifier121Switch Matrix 5725A Amplifier Interface123DAC Assembly (A11)123Basic DAC Theory of Operation.123DAC Assembly Digital Control126DAC Assembly Reference Circuitry126Duty-Cycle Control Circuit127DAC Filter Circuit128DAC Output Stage128Sense Current Cancellation Circuit129Linearity Control Circuit129Negative Offset Circuit130DAC Output Switching130DAC Buffered Reference Sip130Calibration Hardware131ADC Amplifier131ADC Input Selection131ADC Circuit132How the DAC is Used in Calibration134DAC Assembly Calibration134Oscillator Section Overview135Oscillator Control Assembly (A12)135Oscillator Output Assembly (A13)142Power Amplifier Assembly (A16)147High Voltage AC 1100V Range153High Voltage DC 1100V Range and Current 2.2A Range153High Voltage Assemblies (A14 and A15)158Ohms Overview170Ohms Main Assembly (A10)171Ohms Cal Assembly (A9)174Two-Wire Compensation Power Supplies177High Side Cancellation177Low Side Cancellation177Calibrating to the External 10 KW Standard179Calibrating 10 KW and 19 KW180Calibrating 100 KW180Completion of High Resistance Value Calibration180Calibrating to the External 1W Standard183Current/High Resolution Oscillator Assembly Overview (A7)183Current Input Switching184Complementary Drive Circuit186Transconductance Amplifiers186Shunt Resistors186Feedback Loop187Current Output Switching187Generation of the 2.2A Range187Current Guard Buffer188Compliance Limiter188Current/Compliance Voltage Monitor188Current Assembly Calibration188Reference Frequency Amp/Divider191Phase-Locked Loop1915-500k Output Divider192Hi-Res Output Switching192Rear Panel Assembly (A21)192Wideband AC Module (Option -03)197Wideband Oscillator Power Supplies197Wideband Oscillator Digital Control197Phase-Locked Loop and Divider Circuit198Amplitude Control Amplifier and X10 Wideband Amplifier199Wideband Oscillator Filters199Wideband Output Power Amplifier Circuit202Wideband Output Attenuators203Wideband Output RMS Sensor and Amplitude Control Circuit203Wideband Output Overload Control Circuit203Wideband Output Digital Control204Wideband Output Calibration2043. Calibration and Verification207Introduction209Accessing the Fuse210Cleaning the Air Filter211Cleaning the Exterior212Calibration212Calibrating the 5700A/5720A Series II to External Standards212Calibration Requirements213When to Adjust the Calibrator™s Uncertainty Specifications213Calibration Procedure214Range Calibration220Calibrating the Wideband AC Module (Option 5700A-03)223Performing a Calibration Check226Full Verification228Required Equipment for All Tests229Warm-up Procedure for All Verification Tests229Resistance Verification Test231Two-Wire Compensation Verification233DC Voltage Verification Test234DC Voltage One-Tenth Scale Linearity Test235Direct Current Accuracy Verification Test236AC Voltage Frequency Accuracy Test237Output Level Tests For AC V Ranges237AC Current Test( 22 mA to 11A Ranges239AC Current Test, 2 mA and 200 (A Ranges242Rationale for Using Metal-Film Resistors to Measure AC Current243Wideband Frequency Accuracy Test244Wideband AC Voltage Module Output Verification244Wideband Output Accuracy at 1 kHz Test245Wideband Output Flatness Test246Wideband Flatness Calibration Procedure247Optional Tests248DC Voltage Load Regulation Test248DC Voltage Linearity Test249DC Voltage Output Noise (10 Hz to 10 kHz( Test249DC Voltage Output Noise (0(1 to 10 Hz( Test251AC Voltage Distortion Test251Wideband Distortion Testing251AC Voltage Overshoot Test252Minimum Use Requirements252Determining Test Limits for Other Calibration Intervals255Static Awareness2774. Maintenance279Introduction281Cleaning the Air Filter281General Cleaning282Cleaning PCA's282Access Procedures282Top and Bottom Covers282Digital Section Cover282Analog Section Covers282Rear Panel Removal and Installation282Rear Panel Assembly Access283Front Panel Removal and Installation284Display Assembly Removal and Installation284Keyboard Assembly Removal and Installation285Analog Assembly Removal and Installation285Digital Assembly Removal and Installation287Power Transformer Removal and Installation287Hybrid Cover Removal287Front/Rear Binding Post Reconfiguration287Installing a Wideband AC Module (Option -03)289Clearing Ghost Images from the Control Display289Replacing the Clock/Calendar Backup Battery289Using Remote Commands Reserved for Servicing290Using the ETIME Command2905. Troubleshooting293Introduction295Interpreting Diagnostic Fault Codes295Component-level Troubleshooting332Troubleshooting the Wideband Output Assembly (A5)332Troubleshooting the Wideband Oscillator Assembly (A6)334Troubleshooting the Current/Hi-Res Assembly (A7)339Current Section339Hi-Res Oscillator Section344Troubleshooting the Switch Matrix Assembly (A8)346Troubleshooting the Ohms Cal Assembly (A9)348Two-wire Compensation Circuit348Troubleshooting the Ohms Main Assembly (A10)349Troubleshooting the DAC Assembly (A11)350Duty-cycle Control Circuit355ADC Circuit359Buffered Reference SIP Assembly (A11A2):360Troubleshooting the Oscillator Control Assembly (A12)361Troubleshooting the Oscillator Output Assembly (A13)364Troubleshooting the High Voltage Control Assembly (A14)366Magnitude Control Circuit368Troubleshooting the High Voltage/High Current Assembly (A15)369Troubleshooting the Power Amplifier Assembly (A16)371Troubleshooting the Filter/PA Supply Assembly (A18)3746. List of Replaceable Parts377Introduction379How to Obtain Parts379Manual Status Information379Newer Instruments379Service Centers3807. Schematic Diagrams465Size: 38 MBPages: 570Language: EnglishOpen manual