Publication Number December
Service Guide
Agilent 54621D/22D Mixed-Signal Oscilloscope
Agilent 54621A/22A/24A Oscilloscope and
Horizontal Controls select sweep speed and delay parameters
Display shows current input signals
Softkeys extend the functionality of command keys
The Oscilloscope At a Glance
In This Book
Setting up the Oscilloscope
Contents
3 Testing Performance
1 General Information
6 Replacing Assemblies
4 Calibrating and Adjusting
5 Troubleshooting
Contents
General Information
General Information
General Information
To inspect package contents
Agilent IntuiLink Data Capture for 54622A, 22D, or 24A
General Information
Package contents for 54620-Series Oscilloscopes
Option Description
To inspect options and accessories
Description
Accessories available
General Information
Model
General Information
Table 1-3. Power Cords
Acquisition Analog Channels
Performance Characteristics
General Information
Acquisition Analog Channels
with 10074C 101 probe CAT I 500 Vpk, CAT II 400 Vpk
General Information
Vertical System Analog Channels
Vertical System Analog Channels
Vertical System Digital Channels 54621D and 54622D only
General Information
Vertical System Analog Channels continued
Vertical System Analog Channels continued
Horizontal
1-2-5 increments when off, 25 minor increments between major settings when on
General Information
Horizontal
Trigger on a pattern of high, low, and don’t care levels and a rising or falling edge
General Information
Trigger System
Trigger System
Digital D15 - D0 Channel Triggering 54621D and 5462 2D
General Information
Analog Channel Triggering
Analog Channel Triggering
Display System
Measurement Features
General Information
Display System
Optional GPIB Interface Module
3 setups and traces can be saved and recalled internally
General Information
Storage
Environmental Characteristics
General Characteristics
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
2 Press the power switch
To power-on the oscilloscope
To power-on the oscilloscope
To adjust the display intensity
To adjust the display intensity
To increase display intensity, rotate the Intensity control clockwise
2 Press Autoscale
To connect the oscilloscope probes
To 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
4 Connect the grabber to a node in the circuit you want to test
To use the digital probes mixed-signal oscilloscope only
Preparing the Oscilloscope for Use
Channel Pod Ground Circuit Ground
Signal Lead Ground Lead Grabber
2-11
Signals Ground
3 Set up the printer configuration on the oscilloscope
To connect a printer
To connect an RS-232 cable
2 Attach the larger 36-pin “D” connector to the printer
To verify basic oscilloscope operation
This menu is only accessible when the oscilloscope first starts up
Getting started using the oscilloscope interface
2-14
To verify basic oscilloscope operation
Use the Entry knob labeled to adjust the parameter
Selecting a language for Quick Help when the oscilloscope starts up
Using Quick Help
Preparing the Oscilloscope for Use
Loading a language from floppy disk
Cleaning the oscilloscope
Testing Performance
Testing Performance
List of Test Equipment
List of Test Equipment
Testing Performance
See “To construct the test connector ”
To construct the test connector
3 Press the Autoscale key
To test the 54621D/22D Oscilloscope digital channels
Testing Performance
Only the 54621D/22D Mixed-Signal Oscilloscope has Digital Channels
To verify digital channel threshold accuracy
To verify digital channel threshold accuracy
2 Set up the oscilloscope calibrator
See figure
Method 2 - Using the Test Fixture
a Set the threshold voltage shown in the User softkey using the Entry knob on the oscilloscope
Equipment Required to Verify Voltage Measurement Accuracy
To verify voltage measurement accuracy
1 Set up the oscilloscope
To verify voltage measurement accuracy
Volts/Div Setting
Testing Performance
b Set the Volts/Div setting to the value in the first line in Table
Settings Used to Verify Voltage Measurement Accuracy
Wait a few seconds for the measurement to settle
Using a Blocking Capacitor to Reduce Noise
3-12
Equipment Required to Verify Bandwidth
To verify bandwidth
To verify bandwidth
54621A and 54621D
2 Set up the oscilloscope
To verify horizontal Dt and 1/Dt accuracy
To verify horizontal ∆t and 1/∆t accuracy
Equipment Required to Verify Horizontal ∆t and 1/ ∆t Accuracy
To verify horizontal Dt and 1/Dt accuracy
5 Measure the following
7 Measure the following
9 Measure the following
To verify trigger sensitivity
To verify trigger sensitivity
Equipment Required to Verify Trigger Sensitivity
1 Press the Save/Recall key, then press the Default Setup softkey
Test External Trigger Sensitivity
Agilent 54622A/54622D/54624A
Agilent 54622A/22D/24A Performance Test Record
Agilent 54621A/54621D
Agilent 54621A/21D Performance Test Record
Calibrating and Adjusting
Let the Equipment Warm Up Before Adjusting
Calibrating and Adjusting
Read All Cautions and Warnings
USE EXTERNAL FAN TO REDUCE TEMPERATURE
REMOVE POWER TO AVOID DAMAGE
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
HAZARDOUS VOLTAGES
1 Prepare the oscilloscope for the voltage adjustment
To adjust the power supply
To adjust the power supply
measure at J4 on the power supply board
Calibrating and Adjusting
To adjust the power supply
Power Supply Voltage Tolerances
Low Voltage Power Supply Adjustments on the top of the oscilloscope
To perform User Cal
To perform User Cal
1 Disconnect all inputs signals from the oscilloscope
2 Set the rear-panel CALIBRATION switch to UNPROTECTED
When to Adjust the Oscilloscope Display
To adjust the oscilloscope display
Calibrating and Adjusting
To adjust the oscilloscope display
96,=
Troubleshooting
Using the Dummy Load
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 for troubleshooting
Troubleshooting the Oscilloscope
HAZARDOUS VOLTAGES EXIST - REMOVE POWER FIRST
REMOVE POWER TO AVOID DAMAGE
To construct your own dummy load
To construct your own dummy load
2 Connect load resistors to the connector as follows
Troubleshooting
2 Disconnect any external cables from the front panel
To check out the oscilloscope
3 Disconnect the power cord, then remove the cabinet
4 Connect the power cord, then turn on the oscilloscope
6 Disconnect the ribbon cable from the display board
To check out the oscilloscope
8 Is the fan running?
To check the Low Voltage Power Supply
To check the Low Voltage Power Supply
oscilloscope. Connect the power cord and turn on the oscilloscope
Measure the power supply voltages at E1 through E6 on the system
BEWARE OF HAZARDOUS VOLTAGES
To run the internal self-tests
To run the internal self-tests
1 Press the Utility key, then press the Service softkey
2 Begin the internal self tests by pressing the Self Test softkey
Replacing Assemblies
Read All Warnings and Cautions
Tools Used for Disassembly
Replacing Assemblies
See how the Oscilloscope Parts Fit Together
HAZARDOUS VOLTAGES
REMOVE POWER TO AVOID DAMAGE
W A R N I N G W A R N I N G
Replacing Assemblies
To remove the cabinet
To remove the fan
To remove the fan
1 Disconnect the fan cable from the power supply board
Replacing Assemblies
To remove the floppy drive
2 Disconnect the keyboard ribbon cable W2 from the keyboard
To remove the front panel
To remove the display
5 Lift the display and remove it from the deck
Unhooking the power switch shaft
To remove the system board
To remove the system board
Replacing Assemblies
Removing the system board
1 Remove the fan
To remove the power supply
3 Disconnect the ribbon cable from the power supply board
To remove the power supply
5 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
Removing the power supply
To remove the power supply
Replacing Assemblies
C A U T I O N
To remove the keyboard assembly
To remove the keyboard assembly
Replacing Assemblies
To remove the handle
To remove the handle
Pull the sides of the handle out of the cabinet
Replacing Assemblies
Replaceable Parts
Replaceable Parts
To order a replacement part
To order a replacement part
Replaceable Parts
To order a replacement part
Exploded View of the 54621A/22A/24A/21D/22D Oscilloscope
Refurbished Product 2 CH 60MHz54621A-Agilent Express
To order a replacement part
Replaceable Parts
Replaceable Parts
54621A/22A - 3 ea 54624A - 4 ea
To order a replacement part
Cabinet assembly with handle and feet installed
Replaceable Parts
Replaceable Parts
To order a replacement part
Package replacement probe grounds quantity
Package replacement pod grounds quantity
Name
DECLARATION OF CONFORMITY
Product Regulations
ICES/NMB-001
Hazardous voltage symbol
Safety Notices
To clean the instrument
Safety Symbols
Manual Part Number
Notices
Document Warranty
Agilent Technologies, Inc