Troubleshooting the Oscilloscope | Agilent Technologies 54622D

W A R N I N G

C A U T I O N

C A U T I O N

Table 5-1

Troubleshooting the Oscilloscope

The service policy for the 54621A/22A/24A Oscilloscopes and the 54621D/22D Mixed-Signal Oscilloscopes is instrument replacement. Please call (877) 447-7278 to return the defective instrument, and Agilent Technologies will expedite a refurbished instrument to you under the Agilent Express Exchange program.

HAZARDOUS VOLTAGES EXIST — REMOVE POWER FIRST !

The maintenance described in this section is performed with power supplied to the oscilloscope and with the protective covers removed. Only trained service personnel who are aware of the hazards involved should perform the maintenance. Whenever possible, perform the procedures with the power cord removed from the oscilloscope. Read the safety summary at the back of this book before proceeding.

REMOVE POWER TO AVOID DAMAGE !

Do not disconnect any cables or remove any assemblies while power is applied to the oscilloscope, or damage to the oscilloscope can occur.

AVOID ESD DAMAGE TO COMPONENTS !

ELECTROSTATIC DISCHARGE (ESD) can damage electronic components. Use proper ESD precautions when doing any of the procedures in this chapter. As a minimum, place the oscilloscope on a properly grounded ESD mat and wear a properly grounded ESD strap.

Equipment required for troubleshooting

The equipment listed in Table 5-1 is required to troubleshoot the oscilloscope.

Equipment Required to Troubleshoot the Oscilloscope

Equipment	Critical Specifications	Recommended Model/Part
Digital multimeter	Accuracy ±0.05,% 1 mV resolution	Agilent 34401A
Oscilloscope	100 MHz, 1 MΩ input R	Agilent 54622A
Dummy load	Compatible with power supply	See “To construct your own
		dummy load” on page 5-7.

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Agilent Technologies 54622D, 54624A Troubleshooting the Oscilloscope, Equipment Required to Troubleshoot the Oscilloscope

Contents

Agilent 54621D/22D Mixed-Signal Oscilloscope Horizontal Controls select sweep speed and delay parameters Display shows current input signalsSoftkeys extend the functionality of command keys Utilities This Book Contents Contents Solving General Problems with the OscilloscopesTroubleshooting the Oscilloscope 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 Digital Channels on 54621D and 54622D only Performance CharacteristicsAcquisition Analog Channels 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 External EXT Triggering Analog Channel TriggeringDigital D15 D0 Channel Triggering 54621D and 5462 2D 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 To power-on the oscilloscope To power-on the oscilloscopePress the power switch Intensity control To adjust the display intensityTo adjust the display intensity To compensate your probe To connect the oscilloscope probesTo connect the oscilloscope probes Press Autoscale 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 a printer To connect a printerTo connect an RS-232 cable Press the Autoscale key on the front panel To verify basic oscilloscope operationTo verify basic oscilloscope operation Verifying 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 List of Test Equipment Equipment Critical SpecificationsList of Test Equipment Part Number To construct the test connector To construct the test connectorMaterials Required to Construct the Test Connectors Constructing the 8-by-2 Connector To test the 54621D/22D Oscilloscope digital channels To test the 54621D/22D Oscilloscope digital channelsPress the Autoscale key 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 Equipment Critical Specifications Recommended Model/Part Set up the oscilloscopeTo verify voltage measurement accuracy 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 Equipment Required to Verify Bandwidth To verify bandwidthTo verify bandwidth Signal Generator Frequency Setting Calculate the response using this formulaChange the time base to 5 ns/div Selected Channel 54621A/21D 54622A/22D 54624A To verify horizontal Dt and 1/Dt accuracy To verify horizontal ∆t and 1/∆t accuracy 54621A and 54621D only Measure the following54622A/22D/24A only Equipment Required to Verify Trigger Sensitivity To verify trigger sensitivityTo 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 Prepare the oscilloscope for the voltage adjustment To adjust the power supplyTo adjust the power supply Digital multimeter Supply Voltage Tolerance Power Supply Voltage Tolerances +3.3V Adjustment To perform User Cal To perform User Cal To adjust the oscilloscope display To adjust the oscilloscope displayWhen to Adjust the Oscilloscope Display Do not adjust Sub Bri or Cont controls 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 Location of the Low Voltage Power Supply Connectors Connector Load Amps Resistor WattsTo construct your own dummy load To construct your own dummy load To check out the oscilloscope Connect the power cord, then turn on the oscilloscopeTo check out the oscilloscope Signal Name Frequency Pulse Width Voltage Display Signals on the System Board All OscilloscopesLow Voltage Power Supply Tolerances Is the fan running? Location of the Fan Connector Low Voltage Power Supply Test Points To check the Low Voltage Power SupplyTo check the Low Voltage Power Supply 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 Removing the cabinet To remove the cabinetTo remove the cabinet Removing the fan To remove the fanTo remove the fan Removing the floppy drive To remove the floppy driveTo remove the floppy drive Removing the intensity shaft and front panel To remove the front panelTo remove the front panel Removing the display To remove the displayTo remove the display Unhooking the power switch shaft Preparing to remove the system board To remove the system boardTo remove the system board Removing the system board Disconnecting ground wire and ribbon cable To remove the power supplyTo remove the power supply Unhooking the power switch shaft Removing the power supply Lift the keyboard assembly straight out To remove the keyboard assemblyTo remove the keyboard assembly Removing 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 Input Cable 54621D/22D only Option Accessory pouch and front-panel coverProbes Manufacturer’s Address Manufacturer’s NameProduct Name Model Numbers Product Regulations SafetySound Pressure Level Regulatory Information for Canada Safety Agilent Technologies, Inc Document Warranty