Calibration and Adjustment Guide for Acquity Models 54621D and 54624A

Calibrating and Adjusting

To adjust the power supply

To adjust the power supply

The oscilloscope power supply has both a +3.3 V adjustment, and a

+5.1 V / -5.2 V balance adjustment. Other oscilloscope voltages are based on the +3.3 V adjustment.

In this procedure, you will use a digital multimeter to measure the +3.3 V and +5.1 V / -5.2 V test points, and adjust the power supplies to be within tolerance, if necessary.

Table 4-1	Equipment Required to Adjust the Power Supply

	Equipment	Critical Specifications	Recommended Model/Part
	Digital multimeter	0.1 mV resolution, accuracy ±0.05%	Agilent 34401A

1Prepare the oscilloscope for the voltage adjustment.

a Turn off the oscilloscope and disconnect the power cable.

b Remove the oscilloscope cover. For a list of parts, see the “Replaceable Parts” chapter, then return here.

c Place the oscilloscope on its side.

d Connect the negative lead of the digital multimeter to a ground point on the oscilloscope chassis.

e Reconnect the power cable. f Turn on the oscilloscope.

4-4

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Agilent Technologies 54621D, 54624A, 54622D To adjust the power supply, Prepare the oscilloscope for the voltage adjustment

Contents

Agilent 54621D/22D Mixed-Signal Oscilloscope Softkeys extend the functionality of command keys Display shows current input signalsHorizontal Controls select sweep speed and delay parameters Utilities This 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 To inspect options and accessories Option Description Accessories available Model Description Power Cords Plug Type Cable Part Number Performance Characteristics Acquisition Analog ChannelsAcquisition 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 Analog Channel Triggering Digital D15 D0 Channel Triggering 54621D and 5462 2DExternal 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 To power-on the oscilloscope Press the power switchTo power-on the oscilloscope To adjust the display intensity To adjust the display intensityIntensity control To connect the oscilloscope probes To connect the oscilloscope probesTo compensate your probe 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 an RS-232 cableTo connect a printer To verify basic oscilloscope operation To verify basic oscilloscope operationPress the Autoscale key on the front panel 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 List of Test Equipment Equipment Critical SpecificationsList of Test Equipment Part Number Materials Required to Construct the Test Connectors To construct the test connectorTo construct the test connector Constructing the 8-by-2 Connector To 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 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 To verify voltage measurement accuracy Set up the oscilloscopeEquipment Critical Specifications Recommended Model/Part 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 Change the time base to 5 ns/div Calculate the response using this formulaSignal Generator Frequency Setting Selected Channel 54621A/21D 54622A/22D 54624A To verify horizontal ∆t and 1/∆t accuracy To verify horizontal Dt and 1/Dt accuracy Measure 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/21D Performance Test Record Agilent 54621A/54621D Calibrating and Adjusting Calibrating and Adjusting Hazardous Voltages To adjust the power supply To adjust the power supplyPrepare the oscilloscope for the voltage adjustment Digital multimeter Power Supply Voltage Tolerances Supply Voltage Tolerance +3.3V Adjustment To perform User Cal To perform User Cal When to Adjust the Oscilloscope Display To adjust the oscilloscope displayTo 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 To construct your own dummy load Connector Load Amps Resistor WattsLocation of the Low Voltage Power Supply Connectors To construct your own dummy load Connect 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 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 To remove the keyboard assemblyLift the keyboard assembly straight out 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 Option Accessory pouch and front-panel cover ProbesInput Cable 54621D/22D only Product Name Manufacturer’s NameManufacturer’s Address Model Numbers Sound Pressure Level SafetyProduct Regulations Regulatory Information for Canada Safety Document Warranty Agilent Technologies, Inc