Agilent Technologies AGILENT MODELS 6023A and 6028A instruction

Figure A-3. Accessing Local Programming While In Remote Programming Mode

If solid state circuitry is used, connect the Control Isolator Bias to a driver capable of sinking 10mA of current, then connect the driver's output to both of the LOC/REM terminals. Refer to Figure A-3. Either method will enable relays K1 (CV) and K2 (CC) to switch regulation to the front-panel VOLTAGE and CURRENT controls. For Control Isolator Bias voltages greater than 7V, a resistor (Ropt) must be used in series with the Control Isolator Bias common or the Driver's output. Figure A-4 provides a graph for determining the proper series resistance value depending on the Control Isolator Bias voltage being used.

The supply can be returned to the remote programming mode by switching off the Control Isolator Bias common or by increasing the Driver's output signal to within 1V of the Control Isolator Bias voltage. If remote programming is solely desired, leave the LOC/REM terminals open and make the proper connections to the RESISTOR/VOLTAGE PROG. or CURRENT PROG. terminals (See Figures A-5, A-6, A-7).

Table A-2. Mode Switch Settings For Enabling Different Programming Sources

Program Source		Switch Pole Settings
Program Source				Mode
	B1	B2	B3		B4	B5	B6
Resistance	0	0	1		0	0	1
Voltage or	0	1	0		0	1	0
Current

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Agilent Technologies AGILENT MODELS 6023A and 6028A service manual Resistance Voltage or Current

Contents

Autoranging Certification Safety Summary Safety Symbol Definitions Printing History Table of Contents Replaceable Parts Safety Considerations TroubleshootingCircuit Diagrams Scope Manual Revisions Item Description Test Equipment Required Calibration ProcedureIntroduction Operation Verification Tests Type Required Characteristics USE Recommended Model Test Equipment Required Initial Setup 1KVA Calibration Procedure MON Vout Iout CR7 Performance TestsMeasurement Techniques Current-Monitoring Resistor Setup Constant Voltage CV Tests Basic Test Setup RMS Measurement Test Setup, CV Pard Test Peak-To-Peak Measurement Test Setup, CV Pard Test 6023A 6028A KHz Noise, CV Peak-to-Peak Pard Load Transient Recovery Waveform Constant Current CC Tests CC Pard Test Setup Troubleshooting Initial Troubleshooting Procedures Vdc Control Board Test Connector, A2J7PIN no Signal Name WAVEFORM/CONDITIONS Source Repair and Replacement Electrostatic Protection A2 Control Board Removal A3 Front-Panel Board Removal A4 Power Mesh Board RemovalOverall Troubleshooting Procedure A1 Main Board Removal Node Using the TablesSetup Measurement Main Troubleshooting Setup Main Troubleshooting Setup Modified Mains Cord Set For Troubleshooting Troubleshooting No-Output Failures Front-Panel Troubleshooting Board PWM-ON PWM-OFF Defective Check Functional CircuitsA2J7-26 A2J7-25 Symptoms Defective Check Functional Circuits Board Troubleshooting Bias SuppliesSymptoms Defective Circuit Check Components Node + Measurement Source Node + N0DE Node +Measurement Source Setup Measurement Source Power Section BlocksTroubleshooting AC-Turn-on Circuits Setup Measurement Power Limit Troubleshooting PWM & ClockRelay Enable PWM-ON Troubleshooting DC-To-DC Converter+ OUT PWM-OFF Troubleshooting CV Circuit Troubleshooting CC Circuit A4U4OUT Troubleshooting Down ProgrammerTroubleshooting OVP Circuit Waveforms SET Voltage Vdc Node + Page Autoranging Power Block Diagram Overview Block Diagram Simplified Schematic Simplified Schematic DC-to-DC Converter Down Programmer Pfet Control Signals Timing Diagram Constant-Voltage CV Circuit Overvoltage Protection OVP Circuit Power-Limit ComparatorConstant-Current CC Circuit Control-Voltage Comparator Bias Voltage Detector Initial-Ramp CircuitPulse-Width Modulator PWM AC-Surge Dropout Detector Second-Delay Circuit Display CircuitsPage Replaceable Parts Reference Designators Ordering Information Description Abbreviations CR2 Electrical PartsCR1 CR3 Mechanical Parts XA2P1XA2P2 Control Board Assembly CR3 Page Page Page VR5 VR3VR4 DS5 CR5DS1 VR2 IC A/D Cmos 3-1/2 DGTVR1 NPN SI Pfet TS1 Chassis Electrical A3 Board Mechanical Parts A1TB1A2 Board Mechanical Parts A4 Board Mechanical Parts Option 220 220V Operation Option 240 240V Operation Component Location and Circuit Diagrams Schematic Diagram Notes Pin locations for other semi-conductors are shown below Top View, Top Covers Removed Main Board A1 Component Location Control Board A2 Component Location Front-Panel Board A3 Component Location Power Mesh Board A4 Component Location Page Page Option 002 Hardware SpecificationsGeneral Information Output Impedance 10.2 k ohm ± 5% Temperature Coefficient Table A-1. Specifications, Option Remote ProgrammingInput Compliance Voltage ± Current Programming Enable Status Indicators Maximum Output Voltage logic high + Remote Trip and Remote Reset TimingPower-on Preset On State logic low Short Circuit Output Current Table A-1. Specifications, Option Pulse TimingBias Supplies DC Output Ratings 25C ± Pard Typical Installation Connector Assembly Procedure Figure A-1. Mating Connector Assembly Operation Local/Remote Programming Resistance Voltage or Current Remote Resistance Programming Figure A-4. Calculating Value of Series Dropping Resistor Figure A-5. Remote Resistance Programming Remote Monitoring Status Indicators Remote Control Remote Reset Overvoltage Power-On Preset Figure A-8. Remote Control AC Dropout Buffer Circuit Multiple Supply System Shutdown Maintenance Bias Supplies Troubleshooting Resistance and Voltage Programming Troubleshooting Current Programming Figure A-11. Troubleshooting Current Programming of CV Mode Figure A-13. Troubleshooting Status Indicators Page Table A-3. Replacement Parts REF. Desig Model no Description 100 VR9 101 Logic Symbols and Definitions 102 Indicator and Qualifier SymbolsOLD Symbol NEW Symbol Definitions Schematic Notes Schematic Diagram Notes 103 Schematic Notes Figure A-15. Option 002 Board, Component Location 104 Figure A-16. Option 002 Board, Schematic Diagram 105 Page 107 Model 6023AModel 6028A From 108