Agilent Technologies 54624A, 54621D, 54622D, 54622A If the trace display is unusual or unexpected

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Troubleshooting

If the trace display is unusual or unexpected

If the trace display is unusual or unexpected

❏Check that the Horizontal time/division setting is correct for the expected frequency range of the input signals.

❏The sampling speed of the oscilloscope depends on the time/division setting. It may be that when the time/division setting is slower than 1 ms/div, the oscilloscope is sampling too slowly to capture all of the transitions on the waveform.

❏Check that all oscilloscope probes are connected to the correct signals in the circuit under test.

❏Check to see that the ground lead on the cable is securely connected to ground in the circuit under test. For high-speed measurements, each probe’s individual ground lead should also be connected to a ground point closest to the signal point in the circuit under test.

❏Use chapter 2 for information on probing considerations.

❏Check that the trigger setup is correct.

❏A correct trigger setup is the most important factor in helping you capture the data you desire. See the User’s Guide for information about triggering.

❏Check that infinite persistence in the Display menu is turned off, then press the Clear Display softkey.

❏Press the Autoscale key.

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Contents Agilent 54621D/22D Mixed-Signal Oscilloscope Utilities Display shows current input signalsHorizontal Controls select sweep speed and delay parameters Softkeys extend the functionality of command keysThis Book Contents Solving General Problems with the Oscilloscopes Troubleshooting the OscilloscopeContents General Information General Information To inspect package contents General Information Package contents for 54620-Series Oscilloscopes Option Description To inspect options and accessoriesModel Description Accessories availablePlug Type Cable Part Number Power CordsPerformance Characteristics Acquisition Analog ChannelsAcquisition Digital Channels on 54621D and 54622D only Probe ID Agilent/HP Auto probe sense Tek Compatible Vertical System Analog ChannelsAccuracy = ±2.0%80 mV + 0.4%80 mV = ±1.92 mV Vertical System Digital Channels 54621D and 54622D onlySample rate of 200/400 MSa/s HorizontalCan Trigger SystemAnalog Channel Triggering Digital D15 D0 Channel Triggering 54621D and 5462 2DExternal EXT Triggering Display System Measurement FeaturesStorage FFTPower Requirements General CharacteristicsPreparing the Oscilloscope for Use Preparing the Oscilloscope for Use Setting up the Oscilloscope To adjust the handle To adjust the handleTo power-on the oscilloscope Press the power switchTo power-on the oscilloscope To adjust the display intensity To adjust the display intensityIntensity control Press Autoscale To connect the oscilloscope probesTo compensate your probe To connect the oscilloscope probesTo 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 a printer To connect an RS-232 cableTo connect a printer Verifying Basic Oscilloscope Operation To verify basic oscilloscope operationPress the Autoscale key on the front panel To verify 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 diskDisconnect power from the instrument Cleaning the oscilloscopeTesting Performance If a performance test fails Testing PerformancePart Number Equipment Critical SpecificationsList of Test Equipment List of Test EquipmentConstructing the 8-by-2 Connector To construct the test connectorTo construct the test connector Materials Required to Construct the Test ConnectorsTo test the 54621D/22D Oscilloscope digital channels Press the Autoscale keyTo 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 voltage setting DC offset voltage setting Limits Threshold Accuracy Voltage Test SettingsTo verify voltage measurement accuracy Set up the oscilloscopeEquipment Critical Specifications Recommended Model/Part To verify voltage measurement accuracyMV/Div 616 mV 384 mV Settings Used to Verify Voltage Measurement AccuracyUse a Blocking Capacitor to Reduce Noise Using a Blocking Capacitor to Reduce NoiseTo verify bandwidth To verify bandwidthEquipment Required to Verify Bandwidth Selected Channel 54621A/21D 54622A/22D 54624A Calculate the response using this formulaSignal Generator Frequency Setting Change the time base to 5 ns/divTo verify horizontal Dt and 1/Dt accuracy To verify horizontal ∆t and 1/∆t accuracyMeasure the following 54622A/22D/24A only54621A 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/54621D Agilent 54621A/21D Performance Test RecordCalibrating and Adjusting Calibrating and Adjusting Hazardous Voltages Digital multimeter To adjust the power supplyPrepare the oscilloscope for the voltage adjustment To adjust the power supplySupply Voltage Tolerance Power Supply Voltage Tolerances+3.3V Adjustment To perform User Cal To perform User CalDo not adjust Sub Bri or Cont controls To adjust the oscilloscope displayTo adjust the oscilloscope display When to Adjust the Oscilloscope Display96,= Troubleshooting Read All Cautions and Warnings TroubleshootingIf there is no trace display Solving General Problems with the OscilloscopesIf 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 channelEquipment Required to Troubleshoot the Oscilloscope Troubleshooting the OscilloscopeTo construct your own dummy load Connector Load Amps Resistor WattsLocation of the Low Voltage Power Supply Connectors To construct your own dummy loadConnect the power cord, then turn on the oscilloscope To check out the oscilloscopeTo check out the oscilloscope Display Signals on the System Board All Oscilloscopes Low Voltage Power Supply TolerancesSignal Name Frequency Pulse Width Voltage Is the fan running? Location of the Fan ConnectorTo check the Low Voltage Power Supply To check the Low Voltage Power SupplyLow Voltage Power Supply Test Points Beware of Hazardous Voltages If the Fuse is BlownTo 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 Removing the keyboard assembly To remove the keyboard assemblyLift the keyboard assembly straight out To remove 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 Reference Agilent Part Qty Description Designator Number To order a replacement part Replaceable PartsMP1 Option Accessory pouch and front-panel cover ProbesInput Cable 54621D/22D only Model Numbers Manufacturer’s NameManufacturer’s Address Product NameRegulatory Information for Canada SafetyProduct Regulations Sound Pressure LevelSafety Agilent Technologies, Inc Document Warranty

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