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