Agilent Technologies 54622D, 54624A, 54621D, 54622A, 54621A To check the Low Voltage Power Supply

Page 82

C A U T I O N

Figure 5-3

Troubleshooting

To check the Low Voltage Power Supply

To check the Low Voltage Power Supply

1Disconnect the power cord from the oscilloscope. Then remove the oscilloscope cover and set the oscilloscope on its side.

USE AN EXTERNAL FAN TO AVOID OVERHEATING COMPONENTS !

If you operate the oscilloscope with the cabinet removed, you must use an external fan to blow air across the system board. This external air flow is necessary to cool the heat sinks on the system board. Otherwise, damage to the components can occur.

2	((-		-
	Connect the negative lead of the multimeter to a ground point on the
	9(9(			-
	oscilloscope. Connect the power cord and turn on the oscilloscope.
3	Measure the power supply voltages at E1 through E6 on the system
	board. SeeFigure 5-3 and Table-5-4.
	99

Low Voltage Power Supply Test Points

5-11

Image 82

Contents Agilent 54621D/22D Mixed-Signal Oscilloscope Softkeys extend the functionality of command keys Display shows current input signalsHorizontal Controls select sweep speed and delay parameters UtilitiesThis Book Contents Troubleshooting the Oscilloscope Solving General Problems with the OscilloscopesContents General Information General Information To inspect package contents General Information Package contents for 54620-Series Oscilloscopes To inspect options and accessories Option DescriptionAccessories available Model DescriptionPower Cords Plug Type Cable Part NumberAcquisition Analog Channels Performance CharacteristicsAcquisition Digital Channels on 54621D and 54622D only Vertical System Analog Channels Probe ID Agilent/HP Auto probe sense Tek CompatibleVertical System Digital Channels 54621D and 54622D only Accuracy = ±2.0%80 mV + 0.4%80 mV = ±1.92 mVHorizontal Sample rate of 200/400 MSa/sTrigger System CanDigital D15 D0 Channel Triggering 54621D and 5462 2D Analog Channel TriggeringExternal EXT Triggering Measurement Features Display SystemFFT StorageGeneral Characteristics Power RequirementsPreparing the Oscilloscope for Use Preparing the Oscilloscope for Use Setting up the Oscilloscope To adjust the handle To adjust the handlePress the power switch To power-on the oscilloscopeTo power-on the oscilloscope To adjust the display intensity To adjust the display intensityIntensity control To connect the oscilloscope probes To connect the oscilloscope probesTo compensate your probe Press AutoscaleTo use the digital probes mixed-signal oscilloscope only To use the digital probes mixed-signal oscilloscope onlyGrabber Signal Lead Ground Lead Grabber Signals Ground To connect an RS-232 cable To connect a printerTo connect a printer To verify basic oscilloscope operation To verify basic oscilloscope operationPress the Autoscale key on the front panel Verifying Basic Oscilloscope OperationGetting started using the oscilloscope interface To verify basic oscilloscope operation Using Quick Help Preparing the Oscilloscope for Use Loading a language from floppy disk Loading a language from floppy diskCleaning the oscilloscope Disconnect power from the instrumentTesting Performance Testing Performance If a performance test failsList of Test Equipment Equipment Critical SpecificationsList of Test Equipment Part NumberMaterials Required to Construct the Test Connectors To construct the test connectorTo construct the test connector Constructing the 8-by-2 ConnectorPress the Autoscale key To test the 54621D/22D Oscilloscope digital channelsTo test the 54621D/22D Oscilloscope digital channels To verify digital channel threshold accuracy To verify digital channel threshold accuracyMethod 1 Using the Test Connector Method 2 Using the Test Fixture Threshold Accuracy Voltage Test Settings Threshold voltage setting DC offset voltage setting LimitsTo verify voltage measurement accuracy Set up the oscilloscopeEquipment Critical Specifications Recommended Model/Part To verify voltage measurement accuracySettings Used to Verify Voltage Measurement Accuracy MV/Div 616 mV 384 mVUsing a Blocking Capacitor to Reduce Noise Use a Blocking Capacitor to Reduce NoiseTo verify bandwidth To verify bandwidthEquipment Required to Verify Bandwidth Change the time base to 5 ns/div Calculate the response using this formulaSignal Generator Frequency Setting Selected Channel 54621A/21D 54622A/22D 54624ATo verify horizontal ∆t and 1/∆t accuracy To verify horizontal Dt and 1/Dt accuracy54622A/22D/24A only Measure the following54621A and 54621D only To verify trigger sensitivity To verify trigger sensitivityEquipment Required to Verify Trigger Sensitivity Test Internal Trigger Sensitivity Test External Trigger Sensitivity Agilent 54622A/22D/24A Performance Test Record Agilent 54621A/21D Performance Test Record Agilent 54621A/54621DCalibrating and Adjusting Calibrating and Adjusting Hazardous Voltages To adjust the power supply To adjust the power supplyPrepare the oscilloscope for the voltage adjustment Digital multimeterPower Supply Voltage Tolerances Supply Voltage Tolerance+3.3V Adjustment To perform User Cal To perform User CalWhen to Adjust the Oscilloscope Display To adjust the oscilloscope displayTo adjust the oscilloscope display Do not adjust Sub Bri or Cont controls96,= Troubleshooting Troubleshooting Read All Cautions and WarningsSolving General Problems with the Oscilloscopes If there is no trace displayIf the trace display is unusual or unexpected If the trace display is unusual or unexpectedIf you cannot see a channel If you cannot see a channelTroubleshooting the Oscilloscope Equipment Required to Troubleshoot the OscilloscopeTo construct your own dummy load Connector Load Amps Resistor WattsLocation of the Low Voltage Power Supply Connectors To construct your own dummy loadTo check out the oscilloscope Connect the power cord, then turn on the oscilloscopeTo check out the oscilloscope Low Voltage Power Supply Tolerances Display Signals on the System Board All OscilloscopesSignal Name Frequency Pulse Width Voltage Location of the Fan Connector Is the fan running?To check the Low Voltage Power Supply To check the Low Voltage Power SupplyLow Voltage Power Supply Test Points If the Fuse is Blown Beware of Hazardous VoltagesTo run the internal self-tests To run the internal self-testsReplacing Assemblies Replacing Assemblies Avoid Electrical Shock To remove the cabinet To remove the cabinetRemoving the cabinet To remove the fan To remove the fanRemoving the fan To remove the floppy drive To remove the floppy driveRemoving the floppy drive To remove the front panel To remove the front panelRemoving the intensity shaft and front panel To remove the display To remove the displayRemoving the display Unhooking the power switch shaft To remove the system board To remove the system boardPreparing to remove the system board Removing the system board To remove the power supply To remove the power supplyDisconnecting ground wire and ribbon cable Unhooking the power switch shaft Removing the power supply To remove the keyboard assembly To remove the keyboard assemblyLift the keyboard assembly straight out Removing the keyboard assemblyTo remove the handle To remove the handleReplaceable Parts Replaceable Parts To order a replacement part To order a replacement partExploded View of the 54621A/22A/24A/21D/22D Oscilloscope To order a replacement part Replaceable Parts Reference Agilent Part Qty Description Designator NumberMP1 Probes Option Accessory pouch and front-panel coverInput Cable 54621D/22D only Product Name Manufacturer’s NameManufacturer’s Address Model NumbersSound Pressure Level SafetyProduct Regulations Regulatory Information for CanadaSafety Document Warranty Agilent Technologies, Inc

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