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Agilent Technologies 66332A Post-repairCalibration, Inhibit Calibration Switch, Troubleshooting

Models: 6632B 6633B 66332A 6634B

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Post-repair Calibration

Troubleshooting - 3

Post-repair Calibration

Calibration is required annually and whenever certain components are replaced. If components in any of the circuits listed below are replaced, the supply must be re-calibrated as described in Appendix B of the User's Guide.

a.A1 Control Board: Voltage or Current Monitor Amplifier circuits, High Bandwidth Current Amplifier, or Current Monitor resistors R403/R473

b.A2 Interface Board

If the Interface board A2 is replaced, the supply must be initialized first (see "Initialization" later in this chapter) and then be calibrated.

Inhibit Calibration Switch

If "CAL DENIED" appears on the display when calibration is attempted, or if error code 401 occurs when calibrating over the GPIB, the internal INHIBIT CAL switch has been set. This switch setting prevents unauthorized or inadvertent power supply calibration. You must reset this switch in order to calibrate the supply.

This four-section switch, S201, is located on the A2 Interface board near the GPIB connector. The switch has 2 functions related to calibration. One is Inhibit Calibration. With this switch set the supply will not respond to calibration commands, thus providing security against unauthorized calibration. The other switch allows you to bypass the password in case it is forgotten.

4 3 2 1

ON

S201

	Switch 3	Switch 4
Normal	Off	Off
Clear	Off	On
Password
Inhibit	On	Off
Calibration

Calibration Password

In order to enter the calibration mode, you must use the correct password as described in Appendix B of the Operating Manual. As shipped from the factory, the number 0 (zero) is the password. If you use an incorrect password, "OUT OF RANGE" will appear on the display for front panel calibration (or error code 402 occurs for GPIB calibration) and the calibration mode will not be enabled.

If you have changed the password and have forgotten it, you can set the configuration switch on A2 Interface board to bypass the password. See "Calibration Switch" paragraph above.

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Agilent Technologies 66332A Post-repairCalibration, Inhibit Calibration Switch, Calibration Password, Troubleshooting

Contents

Agilent Model 66332A System DC Power SupplyDynamic Measurement DC Source and Agilent Model 6632B, 6633B, 6634BWARRANTY Warranty InformationLIMITATION OF WARRANTY CERTIFICATIONBEFORE APPLYING POWER Safety SummaryDO NOT SERVICE OR ADJUST ALONE SAFETY SYMBOLSDescription Safety Symbol DefinitionsSymbol Instrument Identification Printing HistoryTROUBLESHOOTING Table of ContentsINTRODUCTION VERIFICATION AND PERFORMANCE TESTSDIAGRAMS REPLACEABLE PARTS LISTPRINCIPLES OF OPERATION INDEXPage Introduction Safety ConsiderationsOrganization Related DocumentsElectrostatic Discharge RevisionsManual Revisions Firmware RevisionsTest Equipment Required Verification and Performance TestsIntroduction Figure 2-1.Test Setup Test SetupMeasurement Techniques 2 - Verification and Performance TestsPerformance Tests Operation Verification TestsElectronic Load Current-MonitoringResistorConstant Voltage CV Tests CV SetupVoltage Programming and Readback Accuracy CV Load EffectVerification and Performance Tests CV Source EffectCV Noise PARD CC Setup Transient Recovery TimeConstant Current CC Tests Current Programming and Readback AccuracyLow Range Current Readback Accuracy Current Sink -CCOperationCC Load and Line Regulation Verification and Performance Tests2 - Verification and Performance Tests CC Load EffectCC Source Effect Verification and Performance Tests Performance Test Equipment FormCC Noise PARD 2 - Verification and Performance Tests Performance Test Record FormsVerification and Performance Tests 2 - Verification and Performance Tests Introduction TroubleshootingFlow Charts Overall Troubleshooting3 - Troubleshooting Test Equipment RequiredFigure 3-1Sheet 1. Main Flowchart Troubleshooting3 - Troubleshooting Figure 3-1Sheet 2. Main Flowchart continuedTroubleshooting Figure 3-1Sheet 3. Main Flowchart continued3 - Troubleshooting Figure 3-1Sheet 4. OV at Turn-OnTroubleshooting Figure 3-1Sheet 5. OV at Turn-Oncontinued3 - Troubleshooting Figure 3-1Sheet 6. FS Indicated but Fuse OKTroubleshooting Figure 3-1Sheet 7. No Output Voltage3 - Troubleshooting Figure 3-1Sheet 8. No Output Voltage continuedTroubleshooting Figure 3-1Sheet 9 No Output Voltage continued3 - Troubleshooting Figure 3-1Sheet 10. No Current LimitTroubleshooting Figure 3-1Sheet 11. Unit Does Not OV3 - Troubleshooting Figure 3-1Sheet 12. High Output VoltagePower-on Self-testFailures Specific Troubleshooting ProceduresTable 3-2. Self-TestError Codes/Messages TroubleshootingBias and Rail Voltages CV/CC Status Annunciators TroubleshootingTable 3-3.Bias and Reference Voltages 3 - TroubleshootingTroubleshooting J307 Voltage Measurements3 - Troubleshooting Disabling Protection FeaturesManual Fan Speed Control Calibration Password Inhibit Calibration SwitchPost-repairCalibration TroubleshootingUpgrade Procedure ROM UpgradeInitialization Identifying the FirmwareList of Required Tools Disassembly ProceduresFigure 3-2.Component Location TroubleshootingA2 Interface Board, Removal and Replacement Cover, Removal and ReplacementFront Panel Assembly, Removal and Replacement 3 - TroubleshootingA3 Front Panel Board, Removal and Replacement S1 Line Switch, Removal and ReplacementT1 Power Transformer, Removal and Replacement A1 Main Control Board3 - Troubleshooting Line Voltage WiringFigure 3-3.Transformer Wiring Table 4-1.Power Supply Interface signals I/O Interface SignalsPrinciples of Operation IntroductionA2 Interface Circuits A3 Front Panel CircuitsPrimary Interface Secondary InterfacePrinciples of Operation Figure 4-1.A2/A3 Block Diagram4 - Principles of Operation Power CircuitsA1 Main Board Circuits Principles of Operation Figure 4-2.A1 Block Diagram4 - Principles of Operation Control CircuitsPrinciples of Operation Page Introduction Replaceable Parts ListTable 5-1.Chassis, Electrical Table 5-2.Chassis, Mechanical 5 - Replaceable PartsFigure 5-1.Mechanical Parts ldentification Replaceable Parts5 - Replaceable Parts Table 5-3.A1 Control Board PC Board AssemblyReplaceable Parts - 5 - Replaceable Parts Replaceable Parts 5 - Replaceable Parts Replaceable Parts 5 - Replaceable Parts Replaceable Parts 5 - Replaceable Parts Replaceable Parts 5 - Replaceable Parts Replaceable Parts Table 5-5.A5 AC input/RFI Board Table 5-4.Binding Post Option #020Table 5-6.Relay Option #760 5 - Replaceable PartsGeneral Schematic Notes DiagramsTable 6-1. Model-dependentComponents IntroductionTable 6-1. Model-dependentComponents continued 6 - DiagramsTable 6-2.A1 Board Component Locations Diagrams6 - Diagrams Table 6-2continuedFigure 6-1.A1 Board Component Locations Figure 6-2.A4 and A6 Board Component Locations Figure 6-3.A1 Board schematic sheet A1 Board schematic sheet A1 Board schematic sheet Figure 6-4.A6 Relay Option Board schematic Index