6023A 6028A | Agilent Technologies AGILENT MODELS 6023A and 6028A

6023A

6028A

Figure 2-6. 20KHz Noise, CV Peak-to-Peak PARD

Load Transient Recovery Time. Specified for CV operation only; load transient recovery time is the time for the output voltage to return to within a specified band around its set voltage following a step change in load.

Proceed as follows:

a.Connect the test equipment as shown in Figure 2-3. Operate the load in constant-current mode and set for minimum current.

b.Turn the unit's power on, and turn up current setting to full output.

c.Turn up output voltage to: 6.70Vdc (6023A) 20.0Vdc (6028A)

as read on the digital voltmeter.

d.Set the load to vary the load current between:

27 and 30Adc (6023A)

9 and 10Adc (6028A) at a 30Hz rate.

e.Set the oscilloscope for ac coupling, internal sync and lock on either the positive or negative load transient.

f.Adjust the oscilloscope to display transients as in Figure 2-7.

g.Check that the pulse width of the transient pulse is no more than: 50mV (6023A)

75mV (6028A)

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Agilent Technologies AGILENT MODELS 6023A and 6028A service manual 6023A 6028A, KHz Noise, CV Peak-to-Peak Pard

Contents

Autoranging Certification Safety Summary Printing History Safety Symbol Definitions Table of Contents Replaceable Parts Scope TroubleshootingCircuit Diagrams Safety Considerations Item Description Manual Revisions Operation Verification Tests Calibration ProcedureIntroduction Test Equipment Required Test Equipment Required Type Required Characteristics USE Recommended Model 1KVA Initial Setup MON Calibration Procedure Iout Vout Measurement Techniques Performance TestsCR7 Constant Voltage CV Tests Current-Monitoring Resistor Setup Basic Test Setup RMS Measurement Test Setup, CV Pard Test Peak-To-Peak Measurement Test Setup, CV Pard Test KHz Noise, CV Peak-to-Peak Pard 6023A 6028A Load Transient Recovery Waveform Constant Current CC Tests CC Pard Test Setup Initial Troubleshooting Procedures Troubleshooting WAVEFORM/CONDITIONS Source Control Board Test Connector, A2J7PIN no Signal Name Vdc Electrostatic Protection Repair and Replacement A2 Control Board Removal A1 Main Board Removal A4 Power Mesh Board RemovalOverall Troubleshooting Procedure A3 Front-Panel Board Removal Measurement Using the TablesSetup Node Main Troubleshooting Setup Main Troubleshooting Setup Modified Mains Cord Set For Troubleshooting Front-Panel Troubleshooting Troubleshooting No-Output Failures A2J7-26 A2J7-25 PWM-ON PWM-OFF Defective Check Functional CircuitsBoard Node + Measurement Source Troubleshooting Bias SuppliesSymptoms Defective Circuit Check Components Symptoms Defective Check Functional Circuits Board Measurement Source Node +Node + N0DE Setup Measurement Power Section BlocksTroubleshooting AC-Turn-on Circuits Setup Measurement Source Relay Enable Troubleshooting PWM & ClockPower Limit PWM-OFF Troubleshooting DC-To-DC Converter+ OUT PWM-ON Troubleshooting CC Circuit Troubleshooting CV Circuit Troubleshooting OVP Circuit Troubleshooting Down ProgrammerA4U4OUT Waveforms SET Voltage Vdc Node + Page Block Diagram Overview Autoranging Power Block Diagram Simplified Schematic Simplified Schematic Down Programmer DC-to-DC Converter Constant-Voltage CV Circuit Pfet Control Signals Timing Diagram Control-Voltage Comparator Power-Limit ComparatorConstant-Current CC Circuit Overvoltage Protection OVP Circuit AC-Surge Dropout Detector Initial-Ramp CircuitPulse-Width Modulator PWM Bias Voltage Detector Display Circuits Second-Delay CircuitPage Reference Designators Replaceable Parts Description Abbreviations Ordering Information CR3 Electrical PartsCR1 CR2 XA2P2 XA2P1Mechanical Parts Control Board Assembly CR3 Page Page Page VR4 VR3VR5 DS1 CR5DS5 VR1 IC A/D Cmos 3-1/2 DGTVR2 Pfet NPN SI Chassis Electrical TS1 A4 Board Mechanical Parts A1TB1A2 Board Mechanical Parts A3 Board Mechanical Parts Option 240 240V Operation Option 220 220V 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 General Information SpecificationsOption 002 Hardware Status Indicators Table A-1. Specifications, Option Remote ProgrammingInput Compliance Voltage ± Current Programming Enable Output Impedance 10.2 k ohm ± 5% Temperature Coefficient On State logic low Remote Trip and Remote Reset TimingPower-on Preset Maximum Output Voltage logic high + Pard Typical Table A-1. Specifications, Option Pulse TimingBias Supplies DC Output Ratings 25C ± Short Circuit Output Current Connector Assembly Procedure Installation Operation Figure A-1. Mating Connector Assembly Local/Remote Programming Resistance Voltage or Current Figure A-4. Calculating Value of Series Dropping Resistor Remote Resistance Programming Figure A-5. Remote Resistance Programming Remote Monitoring Remote Control Status Indicators Overvoltage Remote Reset Figure A-8. Remote Control Power-On Preset Multiple Supply System Shutdown AC Dropout Buffer Circuit Bias Supplies Maintenance Troubleshooting Current Programming Troubleshooting Resistance and Voltage Programming Figure A-11. Troubleshooting Current Programming of CV Mode Figure A-13. Troubleshooting Status Indicators Page REF. Desig Model no Description Table A-3. Replacement Parts 100 101 VR9 Definitions Indicator and Qualifier SymbolsOLD Symbol NEW Symbol Logic Symbols and Definitions 102 Schematic Diagram Notes 103 Schematic Notes Figure A-15. Option 002 Board, Component Location 104 Schematic Notes Figure A-16. Option 002 Board, Schematic Diagram 105 Page Model 6028A Model 6023A107 108 From