To check out the oscilloscope | Agilent Technologies 54621A, 54624A

Troubleshooting

To check out the oscilloscope

To check out the oscilloscope

1Is an interface module connected to the rear panel of the oscilloscope? If the answer is yes, follow these steps. Otherwise, go to step 2.

a Turn off the oscilloscope.

b Remove the interface module.

c Turn on the oscilloscope, then check for the failing symptom.

d If the failing symptom is not present, replace the interface module. e If the failing symptom is still present, go to step 2.

2Disconnect any external cables from the front panel.

3 Disconnect the power cord, then remove the cabinet.

C A U T I O N	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.

4Connect the power cord, then turn on the oscilloscope.

•If the oscilloscope display comes on after a few seconds, you will need to check the low voltage power supply. Go to “To check the Low Voltage Power Supply” on page 5-11. Then return here.

•If, after checking the low voltage power supply, the voltages are within the test limits, go to step 8. If they are not within the test limits, go to step 6.

If the display did not come on, follow these steps:

aDisconnect the power cord.

bCheck to verify that all of the cable connections are secure.

cCheck the low voltage power supply. Go to “To check the Low Voltage Power Supply” on page 5-11.

If the voltages are within the limits go to step 5. If the voltages are not within the limits, go to step 6.

5-8

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Agilent Technologies 54621A, 54624A To check out the oscilloscope, Connect the power cord, then turn on the oscilloscope

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 keys This 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 Option Description To inspect options and accessories Model Description Accessories available Plug Type Cable Part Number Power Cords Acquisition Analog Channels Performance CharacteristicsAcquisition Digital Channels on 54621D and 54622D only Probe ID Agilent/HP Auto probe sense Tek Compatible Vertical System Analog Channels Accuracy = ±2.0%80 mV + 0.4%80 mV = ±1.92 mV Vertical System Digital Channels 54621D and 54622D only Sample rate of 200/400 MSa/s Horizontal Can Trigger System Digital D15 D0 Channel Triggering 54621D and 5462 2D Analog Channel TriggeringExternal EXT Triggering Display System Measurement Features Storage FFT Power Requirements General Characteristics Preparing the Oscilloscope for Use Preparing the Oscilloscope for Use Setting up the Oscilloscope To adjust the handle To adjust the handle Press the power switch To power-on the oscilloscopeTo 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 probes To use the digital probes mixed-signal oscilloscope only To use the digital probes mixed-signal oscilloscope only Grabber Signal Lead Ground Lead Grabber Signals Ground To connect an RS-232 cable To connect a printerTo connect a printer Verifying Basic Oscilloscope Operation To verify basic oscilloscope operationPress the Autoscale key on the front panel To verify basic oscilloscope operation Getting 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 disk Disconnect power from the instrument Cleaning the oscilloscope Testing Performance If a performance test fails Testing Performance Part Number Equipment Critical SpecificationsList of Test Equipment List of Test Equipment Constructing the 8-by-2 Connector To construct the test connectorTo construct the test connector Materials Required to Construct the Test Connectors Press 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 accuracy Method 1 Using the Test Connector Method 2 Using the Test Fixture Threshold voltage setting DC offset voltage setting Limits Threshold Accuracy Voltage Test Settings To verify voltage measurement accuracy Set up the oscilloscopeEquipment Critical Specifications Recommended Model/Part To verify voltage measurement accuracy MV/Div 616 mV 384 mV Settings Used to Verify Voltage Measurement Accuracy Use a Blocking Capacitor to Reduce Noise Using a Blocking Capacitor to Reduce Noise To 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/div To verify horizontal Dt and 1/Dt accuracy To verify horizontal ∆t and 1/∆t accuracy 54622A/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/54621D Agilent 54621A/21D Performance Test Record Calibrating and Adjusting Calibrating and Adjusting Hazardous Voltages Digital multimeter To adjust the power supplyPrepare the oscilloscope for the voltage adjustment To adjust the power supply Supply Voltage Tolerance Power Supply Voltage Tolerances +3.3V Adjustment To perform User Cal To perform User Cal Do not adjust Sub Bri or Cont controls To adjust the oscilloscope displayTo adjust the oscilloscope display When to Adjust the Oscilloscope Display 96,= Troubleshooting Read All Cautions and Warnings Troubleshooting If there is no trace display Solving General Problems with the Oscilloscopes If the trace display is unusual or unexpected If the trace display is unusual or unexpected If you cannot see a channel If you cannot see a channel Equipment Required to Troubleshoot the Oscilloscope Troubleshooting the Oscilloscope To construct your own dummy load Connector Load Amps Resistor WattsLocation of the Low Voltage Power Supply Connectors To construct your own dummy load To 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 Is the fan running? Location of the Fan Connector To 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 Blown To run the internal self-tests To run the internal self-tests Replacing 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 assembly To remove the handle To remove the handle Replaceable Parts Replaceable Parts To order a replacement part To order a replacement part Exploded View of the 54621A/22A/24A/21D/22D Oscilloscope Reference Agilent Part Qty Description Designator Number To order a replacement part Replaceable Parts MP1 Probes Option Accessory pouch and front-panel coverInput Cable 54621D/22D only Model Numbers Manufacturer’s NameManufacturer’s Address Product Name Regulatory Information for Canada SafetyProduct Regulations Sound Pressure Level Safety Agilent Technologies, Inc Document Warranty