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Agilent Technologies 54621A, 54624A, 54621D, 54622D Solving General Problems with the Oscilloscopes

Models: 54621A 54622A 54622D 54621D 54624A

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Solving General Problems with the Oscilloscopes

Solving General Problems with the Oscilloscopes

This section describes how to solve general problems that you may encounter while using the 54621A/22A/24A Oscilloscopes and the 54621D/22D Mixed-Signal Oscilloscopes to make measurements.

After troubleshooting the oscilloscope, if you need to replace parts, refer to the “Replaceable Parts” chapter.

If there is no trace display

❏Check that the power cord is connected to the oscilloscope and to a live power source.

❏Check that the front-panel power switch is set to 1 (on).

❏Check that the display is illuminated and that the INTENSITY knob is adjusted correctly.

❏If there is no display, go to the troubleshooting procedures in this chapter.

❏Check that the oscilloscope probe lead wires are securely inserted into the connector assembly and that the probe clips make good contact with the probe lead wires.

❏Check that the probe clips are securely connected to points in the circuit under test, and that the ground is connected.

❏Check that the circuit under test is powered on.

❏Press the Autoscale key.

❏Reset the oscilloscope.

•To reset the entire oscilloscope, press and hold any softkey and switch the oscilloscope power on. Release the softkey when the display appears.

❏Obtain service from Agilent Technologies, if necessary.

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Agilent Technologies 54621A, 54624A, 54621D Solving General Problems with the Oscilloscopes, If there is no trace display

Contents

Agilent 54621A/22A/24A Oscilloscope and Service GuideAgilent 54621D/22D Mixed-Signal Oscilloscope Publication Number DecemberSoftkeys extend the functionality of command keys Display shows current input signalsHorizontal Controls select sweep speed and delay parameters The Oscilloscope At a GlanceIn This Book 1 General Information Contents3 Testing Performance Setting up the OscilloscopeContents 4 Calibrating and Adjusting5 Troubleshooting 6 Replacing AssembliesGeneral Information General Information To inspect package contents General InformationAgilent IntuiLink Data Capture for 54622A, 22D, or 24A Package contents for 54620-Series Oscilloscopes General InformationTo inspect options and accessories Option DescriptionModel Accessories availableGeneral Information DescriptionTable 1-3. Power Cords General InformationAcquisition Analog Channels Performance CharacteristicsGeneral Information Acquisition Analog ChannelsVertical System Analog Channels General InformationVertical System Analog Channels with 10074C 101 probe CAT I 500 Vpk, CAT II 400 VpkVertical System Analog Channels continued General InformationVertical System Analog Channels continued Vertical System Digital Channels 54621D and 54622D onlyHorizontal 1-2-5 increments when off, 25 minor increments between major settings when onGeneral Information HorizontalTrigger System General InformationTrigger System Trigger on a pattern of high, low, and don’t care levels and a rising or falling edgeAnalog Channel Triggering General InformationAnalog Channel Triggering Digital D15 - D0 Channel Triggering 54621D and 5462 2DDisplay System Measurement FeaturesGeneral Information Display SystemStorage 3 setups and traces can be saved and recalled internallyGeneral Information Optional GPIB Interface ModulePower Requirements General CharacteristicsGeneral Characteristics Environmental 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 To power-on the oscilloscope2 Press the power switch To increase display intensity, rotate the Intensity control clockwise To adjust the display intensityTo adjust the display intensity To connect the oscilloscope probes To connect the oscilloscope probesTo compensate your probe 2 Press AutoscaleTo use the digital probes mixed-signal oscilloscope only To use the digital probes mixed-signal oscilloscope onlyPreparing the Oscilloscope for Use To use the digital probes mixed-signal oscilloscope only4 Connect the grabber to a node in the circuit you want to test Signal Lead Ground Lead Grabber Channel Pod Ground Circuit GroundSignals Ground 2-112 Attach the larger 36-pin “D” connector to the printer To connect a printerTo connect an RS-232 cable 3 Set up the printer configuration on the oscilloscopeTo verify basic oscilloscope operation 2-14 Getting started using the oscilloscope interfaceThis menu is only accessible when the oscilloscope first starts up Use the Entry knob labeled to adjust the parameter To verify basic oscilloscope operationUsing Quick Help Selecting a language for Quick Help when the oscilloscope starts upPreparing the Oscilloscope for Use Loading a language from floppy disk Cleaning the oscilloscope Testing Performance Testing Performance See “To construct the test connector ” List of Test EquipmentTesting Performance List of Test EquipmentTo construct the test connector Only the 54621D/22D Mixed-Signal Oscilloscope has Digital Channels To test the 54621D/22D Oscilloscope digital channelsTesting Performance 3 Press the Autoscale keyTo verify digital channel threshold accuracy To verify digital channel threshold accuracy2 Set up the oscilloscope calibrator Method 2 - Using the Test Fixture See figurea Set the threshold voltage shown in the User softkey using the Entry knob on the oscilloscope To verify voltage measurement accuracy To verify voltage measurement accuracy1 Set up the oscilloscope Equipment Required to Verify Voltage Measurement AccuracySettings Used to Verify Voltage Measurement Accuracy Testing Performanceb Set the Volts/Div setting to the value in the first line in Table Volts/Div Setting3-12 Using a Blocking Capacitor to Reduce NoiseWait a few seconds for the measurement to settle 54621A and 54621D To verify bandwidthTo verify bandwidth Equipment Required to Verify Bandwidth2 Set up the oscilloscope Equipment Required to Verify Horizontal ∆t and 1/ ∆t Accuracy To verify horizontal ∆t and 1/∆t accuracyTo verify horizontal Dt and 1/Dt accuracy 9 Measure the following 5 Measure the following7 Measure the following To verify horizontal Dt and 1/Dt accuracyEquipment Required to Verify Trigger Sensitivity To verify trigger sensitivityTo verify trigger sensitivity 1 Press the Save/Recall key, then press the Default Setup softkey Test External Trigger Sensitivity Agilent 54622A/22D/24A Performance Test Record Agilent 54622A/54622D/54624AAgilent 54621A/21D Performance Test Record Agilent 54621A/54621DCalibrating and Adjusting Read All Cautions and Warnings Calibrating and AdjustingLet the Equipment Warm Up Before Adjusting W A R N I N G C A U T I O N C A U T I O N C A U T I O N REMOVE POWER TO AVOID DAMAGEUSE EXTERNAL FAN TO REDUCE TEMPERATURE HAZARDOUS VOLTAGESTo adjust the power supply To adjust the power supply1 Prepare the oscilloscope for the voltage adjustment Power Supply Voltage Tolerances Calibrating and AdjustingTo adjust the power supply measure at J4 on the power supply boardLow Voltage Power Supply Adjustments on the top of the oscilloscope 2 Set the rear-panel CALIBRATION switch to UNPROTECTED To perform User Cal1 Disconnect all inputs signals from the oscilloscope To perform User CalTo adjust the oscilloscope display To adjust the oscilloscope displayCalibrating and Adjusting When to Adjust the Oscilloscope Display96,= Troubleshooting Troubleshooting Using the Dummy LoadSolving 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 channelREMOVE POWER TO AVOID DAMAGE Troubleshooting the OscilloscopeHAZARDOUS VOLTAGES EXIST - REMOVE POWER FIRST Equipment required for troubleshootingTroubleshooting To construct your own dummy load2 Connect load resistors to the connector as follows To construct your own dummy load4 Connect the power cord, then turn on the oscilloscope To check out the oscilloscope3 Disconnect the power cord, then remove the cabinet 2 Disconnect any external cables from the front panel6 Disconnect the ribbon cable from the display board 8 Is the fan running? To check out the oscilloscopeMeasure the power supply voltages at E1 through E6 on the system To check the Low Voltage Power Supplyoscilloscope. Connect the power cord and turn on the oscilloscope To check the Low Voltage Power SupplyBEWARE OF HAZARDOUS VOLTAGES 2 Begin the internal self tests by pressing the Self Test softkey To run the internal self-tests1 Press the Utility key, then press the Service softkey To run the internal self-testsReplacing Assemblies See how the Oscilloscope Parts Fit Together Tools Used for DisassemblyReplacing Assemblies Read All Warnings and CautionsReplacing Assemblies REMOVE POWER TO AVOID DAMAGEW A R N I N G W A R N I N G HAZARDOUS VOLTAGESTo remove the cabinet Replacing Assemblies To remove the fan1 Disconnect the fan cable from the power supply board To remove the fanTo remove the floppy drive To remove the front panel 2 Disconnect the keyboard ribbon cable W2 from the keyboardTo remove the display Unhooking the power switch shaft 5 Lift the display and remove it from the deckTo remove the system board Removing the system board Replacing AssembliesTo remove the system board To remove the power supply To remove the power supply3 Disconnect the ribbon cable from the power supply board 1 Remove the fan5 Use a flat-blade screwdriver to gently unhook the latch that holds the white power-actuator shaft to the power switch, then disconnect the shaft from the power switch. After you disconnect the shaft, make sure you position it in the recess along the side of the display bracket Replacing Assemblies To remove the power supplyRemoving the power supply Replacing Assemblies To remove the keyboard assemblyTo remove the keyboard assembly C A U T I O NReplacing Assemblies To remove the handlePull the sides of the handle out of the cabinet 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 partReplaceable Parts Replaceable Parts To order a replacement partReplaceable Parts Refurbished Product 2 CH 60MHz54621A-Agilent ExpressReplaceable Parts To order a replacement partCabinet assembly with handle and feet installed 54621A/22A - 3 ea 54624A - 4 eaPackage replacement pod grounds quantity To order a replacement partPackage replacement probe grounds quantity Replaceable PartsDECLARATION OF CONFORMITY NameICES/NMB-001 Product RegulationsSafety Symbols Safety NoticesTo clean the instrument Hazardous voltage symbolAgilent Technologies, Inc NoticesDocument Warranty Manual Part Number