Calibrating and Adjusting | Agilent Technologies 54621A, 54624A

Calibrating and Adjusting

This chapter explains how to adjust the oscilloscope for optimum operating performance. You should perform the hardware adjustments and self-calibration according to the following recommendations.

•Perform hardware adjustments every 12 months or after 2,000 hours of operation.

•Perform self-calibration:

•every 6 months or after 1000 hours of operation

•if the ambient temperature is >10 °C from the calibration temperature

•if you want to maximize the measurement accuracy

The amount of use, environmental conditions, and experience with other instruments help determine if you need shorter adjustment intervals.

In this chapter, you will:

•Adjust the power supply

•Perform self-calibration

•Adjust the display

Let the Equipment Warm Up Before Adjusting

Before you start the adjustments, let the oscilloscope and test equipment warm up for at least 30 minutes.

Read All Cautions and Warnings

Read the following cautions and warning before making adjustments or performing self-calibration.

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Agilent Technologies 54621A, 54624A, 54621D, 54622D, 54622A manual Calibrating and Adjusting

Contents

Agilent 54621D/22D Mixed-Signal Oscilloscope Display shows current input signals Horizontal Controls select sweep speed and delay parametersSoftkeys extend the functionality of command keys Utilities 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 To inspect options and accessories Option Description Accessories available Model Description Power Cords Plug Type Cable Part Number Acquisition Analog Channels Performance CharacteristicsAcquisition Digital Channels on 54621D and 54622D only Vertical System Analog Channels Probe ID Agilent/HP Auto probe sense Tek Compatible Vertical System Digital Channels 54621D and 54622D only Accuracy = ±2.0%80 mV + 0.4%80 mV = ±1.92 mV Horizontal Sample rate of 200/400 MSa/s Trigger System Can Digital D15 D0 Channel Triggering 54621D and 5462 2D Analog Channel TriggeringExternal EXT Triggering Measurement Features Display System FFT Storage General Characteristics Power Requirements 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 To connect the oscilloscope probes To compensate your probeTo 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 an RS-232 cable To connect a printerTo connect a printer To verify basic oscilloscope operation Press the Autoscale key on the front panelTo 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 Cleaning the oscilloscope Disconnect power from the instrument Testing Performance Testing Performance If a performance test fails Equipment Critical Specifications List of Test EquipmentList 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 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 Accuracy Voltage Test Settings Threshold voltage setting DC offset voltage setting Limits Set up the oscilloscope Equipment Critical Specifications Recommended Model/PartTo verify voltage measurement accuracy To verify voltage measurement accuracy Settings Used to Verify Voltage Measurement Accuracy MV/Div 616 mV 384 mV Using a Blocking Capacitor to Reduce Noise Use a Blocking Capacitor to Reduce Noise To verify bandwidth To verify bandwidthEquipment Required to Verify Bandwidth Calculate the response using this formula Signal Generator Frequency SettingChange the time base to 5 ns/div Selected Channel 54621A/21D 54622A/22D 54624A To verify horizontal ∆t and 1/∆t accuracy To verify horizontal Dt and 1/Dt 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/21D Performance Test Record Agilent 54621A/54621D Calibrating and Adjusting Calibrating and Adjusting Hazardous Voltages To adjust the power supply Prepare the oscilloscope for the voltage adjustmentTo adjust the power supply Digital multimeter Power Supply Voltage Tolerances Supply Voltage Tolerance +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 Troubleshooting Read All Cautions and Warnings Solving General Problems with the Oscilloscopes If there is no trace display 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 Troubleshooting the Oscilloscope Equipment Required to Troubleshoot the Oscilloscope Connector Load Amps Resistor Watts Location of the Low Voltage Power Supply ConnectorsTo 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 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 Voltages 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 To remove the keyboard assembly Lift the keyboard assembly straight outTo 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 To order a replacement part Replaceable Parts Reference Agilent Part Qty Description Designator Number MP1 Probes Option Accessory pouch and front-panel coverInput Cable 54621D/22D only Manufacturer’s Name Manufacturer’s AddressProduct Name Model Numbers Safety Product RegulationsSound Pressure Level Regulatory Information for Canada Safety Document Warranty Agilent Technologies, Inc