HP 54620A Manual
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HP References in this Manual
This manual may contain references to HP or Hewlett-Packard. Please note that
Hewlett-Packard's former test and measurement, semiconductor products and
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potential confusion, the only change to product numbers and names has been in
the company name prefix: where a product number/name was HP XXXX the
current name/number is now Agilent XXXX. For example, model number
HP8648A is now model number Agilent 8648A.
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The HP 54620A/C at a Glance
Displayshows thecurrent input signals
and much more
•Up tosixteen (16) channels in normal
ordelayedmode
•Indicatorsfor glitch or normal
acquisition,timebase,channel
activity, trigger andacquisition status
•Softkey labels
•Measurement results
•Color Palettes
Channel Controls select, position, and
labelinputs
•Turn channels onor off individually
or in groups of8
•Rearrange order of channelsto
group related signals
•Create and display labels toidentify
channels, and setchannel colors
General Controls measure, save and
restore results, and configure the
analyzer
•Measurement keysprovide
automatic single or dual-channel
time andfrequencymeasurements,
or use cursors to makemanual
measurements
•Save orrecallmeasurement
configurationsorprevious results
•Autoscale performs simple
one-button setup ofthe analyzer
Horizontal Controls select sweep speed
and delay parameters
•Sweepspeeds from 5ns/div to 1s/div
•Delay control moves waveform
display to point of interest
•Delayed mode and delay allow
zooming in to show aportion of
waveformindetail(splitscreen)
Storage Keys begin and end data
acquisition
•Run/Stop startsand stopscontinuous
acquisitions
•Single performsoneacquisition
•Autostore accumulates and displays
the results of multipleacquisitions
(like persistence on an oscilloscope)
•Erase clearsthe current acquisition
and all accumulated data
TriggerKeys define what data will be
captured bythe analyzer
•Edge mode allows triggering on a
positiveor negative edge(orboth) of
anysinglechannel
•Patternmode allowstriggering on a
pattern of channels eitherhigh,low,
or don’t care,with asingle edge
qualifier
•Advancedmode allows sequential
triggers, combined patterns, patterns
andedges,patterndurations,and
edge occurrence counts
Softkeys extendthe functionality of
command keys
Selectmeasurementtypes, operating
modes,trigger specifications, labeldata,
and more
TriggerInput/Output
Trigger the HP 54620A/C from other
instruments or use the HP54620A/C to
trigger other instruments
Channel Inputs through a flexible
probingsystem
•Sixteenchannels through a dual
8-channel cable with micro-grabbers
•Set logiclevels asTTL, CMOS,ECL,or
to a user-definablevoltage
2
Measure time
Save/Recall Entry
LOGICANALYZER
54620A
16 CHANNEL 500 MSa/s STORAGE
TRIGGER
HORIZONTAL
CHANNEL
INPUTS
Line
~5V
Logic
levels
Label
Single
channel
Edge
Auto
scale
Adv
Trace
Pattern
5 ns1 s
150
Time/Div
Run
Stop
Dual
channel
Display
Setup
Mode
Single
Cursors
Print
Utility
Auto-
store Erase
Select
ov
Trigger out
Delay
Position
On
Off
Main
Delayed
1 MQ
+40 V Max
Ext trigger in
Trigger
Keys
Display Channel
Controls General
Controls Horizontal
Controls Storage
Keys
Softkeys Brightness
Control(for
HP 54620A
only)
Power
Trigger
Input/
Output
Channel
Inputs
Micro-grabbers
3
In This Book
The HP 54620A/C User and Service Guide is your guide to using the
features of the Logic Analyzer in the design and troubleshooting of digital
system circuitry.
Chapter 1, “Getting Started,” explains how to set up the analyzer and make
basic measurements. It also gives an overview of basic analyzer operational
concepts including use and interpretation of the front panel and display.
Chapter 2, “Making Analyzer Measurements,” shows you how to use the
instrument configuration features, measure waveform data, control data
acquisition, examine captured data in more detail, set up analyzer trigger
conditions, and shows how to use the analyzer with other instruments.
Chapter 3, “Solving Problems,” shows you how to fix the most common
kinds of problems that might occur when you begin operating the analyzer.
Chapter 4, “Ensuring Accurate Measurements,” explains the relationships
between the analyzer time base and other time-dependent functions,
discusses the effect of probes on measurement accuracy, and explains the
glitch detection system. After you have made a few measurements with the
HP 54620A/C, it is a good idea to read this chapter.
Chapter 5, “Testing, Adjusting, and Troubleshooting the Logic Analyzer,”
explains how to test the HP 54620A/C to ensure that it operates correctly.
The chapter also shows how adjust and troubleshoot the analyzer.
Chapter 6, “Replaceable Parts,” explains how to remove and replace the
various assemblies in the analyzer. The chapter also lists the replaceable
parts for the analyzer and gives ordering information.
Chapter 7, “Performance Characteristics,” lists the measurement
performance standards to which the instrument is tested.
Chapter 8, “Messages,” lists the status and error messages that may be
displayed by the analyzer, explains their causes, and tells what to do to
correct the problem.
If you want to automate HP 54620A/C measurements using a programmable
controller such as an IBM-compatible PC or an HP 9000 Series 700 controller,
see the HP 54620A/C Programmer’s Guide and the HP 54620A/C
Programmer’s Reference. The Programmer’s Reference is supplied as a
help file on a 3.5" diskette. The diskette includes a help file viewer for
Microsoft Windows 3.1, and Microsoft Write editor versions of the files. ASCII
files are also supplied.
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Contents
1 Getting Started
Preparing the Analyzer 21
To check package contents 22
To check optional accessories 24
To power-on the logic analyzer 27
To adjust the handle 28
To adjust display brightness 29
Using Color 30
To select the color palettes and observe colors 31
To assign colors to channels 33
To print in color 34
Making Measurements 35
Learn the front panel 35
To probe a circuit 42
To set up an acquisition using Autoscale 44
To start and stop an acquisition 46
To define a simple edge trigger 47
To adjust the time base (sweep speed) 48
To turn channels on and off 49
To rearrange the channels 50
2 Making Analyzer Measurements
Setting Logic Levels 53
To change the logic threshold for input signals 54
Controlling Data Acquisition 55
To take a single acquisition 56
To use Auto Glitch Detect 57
To accumulate the results of every acquisition 58
To erase the waveform display 58
7
Using Labels 59
To turn the label display on or off 59
To assign a label to a channel 60
To define a new label 62
To initialize the label list 64
Triggering the Analyzer 65
Trigger types 65
To define the trigger mode 70
To define an edge trigger 72
To define a pattern trigger 73
To define an advanced trigger 74
Examining the Captured Data 80
Viewing acquired data with delayed sweep 80
To show both main and delayed sweep displays 82
To change the time reference position 83
To pan the display 86
To modify the graticule 87
To print the display 88
Measuring Waveform Data 89
Ways to measure data 89
To use the cursors 94
To measure waveform parameters on a single channel 96
To measure channel-to-channel delay 98
To measure setup time 100
To measure hold time 102
Using the Analyzer with Other Instruments 104
Extending trigger capabilities 104
To use the external trigger input 108
To use the trigger output 110
Contents
8
Saving and Recalling the Configuration 111
Using memories to save and recall configurations 111
To save a trace waveform 114
To recall a trace waveform 115
To clear a previously saved trace 116
To save the instrument setup 117
To recall the instrument setup 118
To reset the instrument setup 119
3 Solving Problems
If there is no trace display 123
If the trace display is unusual or unexpected 124
If you can’t see a channel 125
4 Ensuring Accurate Measurements
Time base and Acquisition 129
Probing the Circuit Under Test 139
Glitch Detection 143
5 Testing, Adjusting, and Troubleshooting the Analyzer
Testing the Analyzer 151
To perform self-tests 152
To test the keyboard 153
To test the display 154
To test the acquisition system 154
Building Test Accessories 155
To make the test connectors 156
To make the dummy load 158
Contents
9
Adjusting the Logic Analyzer 159
To adjust the power supply 160
To adjust the display (HP 54620A only) 162
Troubleshooting the Logic Analyzer 164
To troubleshoot the logic analyzer 165
To check the LVPS 168
Testing Threshold Accuracy 169
Step 1. To set up the equipment 170
Step 2. To connect the logic analyzer 171
Step 3. To test the thresholds 172
Testing Time Interval Accuracy 173
Step 1. To connect the logic analyzer 174
Step 2. To set up the equipment 175
Step 3. To set up the logic analyzer 176
Step 4. To make the measurement 177
6 Replaceable Parts
Removing and Replacing Assemblies 181
To remove the cabinet 182
To remove the fan 183
To remove the front panel 184
To remove the display 185
To remove the system board 186
To remove the power supply 187
To remove the keyboard 188
To remove the handle 189
Replaceable Parts 190
To order a replacement part 191
Contents
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12
Figures
Figure 1. Using the Logic Analyzer 19
Figure 1A. Refining the Trigger Specification 20
Figure 2. Items Supplied with the HP 54620A/C Logic Analyzer 23
Figure 3. Optional Accessories for the HP 54620A/C Logic Analyzer 25
Figure 4. HP 54620A Brightness Control 29
Figure 5. HP 54620C with Label Menu Selected and Single Channel
Highlighted 34
Figure 6. HP 54620A Logic Analyzer Front Panel 36
Figure 7. HP 54620A/C Display 38
Figure 8. Sample Autoscale Measurement 44
Figure 9. Edge Trigger on Channel 0 47
Figure 10. Logic Threshold Setup 53
Figure 11. Waveform Display with Auto Glitch Detect Enabled 57
Figure 12. HP 54620A/C Label Definition Display 61
Figure 13. Pattern Trigger Setup 67
Figure 14. Advanced Trigger Setup (with Overview On) 68
Figure 15. Advanced Trigger Softkeys for Operators with Two Sources 69
Figure 16. Acquisition Memory 70
Figure 17. Pulse Train with Constant-Duration Pulse 77
Figure 18. Sequential Output from State Machine 77
Figure 19. System Failure on Third Keystroke 78
Figure 20. Delayed Sweep 81
Figure 21. Time Reference at Center, Delay of 15 µs on Main Sweep 84
Figure 22. Delayed Sweep with Delay of 8 µs 85
Figure 23. Measuring the Period of an Irregular Waveform 90
Figure 24. Single-Channel Measurements 91
Figure 25. Channel-to-Channel Delay Measurement 92
Figure 26. Measurement Within the Delayed Sweep Window 93
Figure 27. Setup Time Measurement 101
Figure 28. Hold Time Measurement 103
Figure 29. Connections for External Trigger from an Emulator 105
Figure 30. Connections for External Trigger using an Oscilloscope Probe 106
Figure 31. Connections for Triggering an Oscilloscope 107
Figure 32. Using the External Trigger Input as an Edge Trigger 109
13
Figure 33. Trace Memory Save/Recall 112
Figure 34. Setup Memory 113
Figure 35. Relationship Between Time base and Analyzer Functions 129
Figure 36. Acquisition Memory 131
Figure 37. Memory Bar 132
Figure 38. Single Acquisition, Time Reference Center, Positive
Delay of 75 µs 134
Figure 39. Panning the Display to View the Start of Acquisition 135
Figure 40. Single Acquisition, Time Reference Right, Negative
Delay of 80 µs 136
Figure 41. Panning the Display to View the Trigger Point 137
Figure 42. DC and Low-Frequency Probe Equivalent Circuit 139
Figure 43. High-Frequency Probe Equivalent Circuit 140
Figure 44. Impedance versus Frequency for Both Probe Circuit Models 140
Figure 45. Common Mode Input Voltage Model 141
Figure 46. Glitch Display 144
Figure 47. Aliasing 144
Figure 48. Reconstruction of Waveform with Glitch Capture 145
Figure 49. Waveform Display with Sampling Rate Too Low 146
Figure 50. Waveform Display with Sufficient Sampling Rate 147
Figure 51. Data Output Relative to Clock 148
Figure 52. 8-by-2 Connector Setup 156
Figure 53. 1-by-2 Connector Setup 157
Figure 54. Power Supply Adjustment 161
Figure 55. Display Adjustment 163
Figure 56. Threshold Test Setup 171
Figure 57. Time Interval Accuracy Setup 174
Figure 58. Front Panel Removal 184
Figure 59. Unhooking the Power Switch Shaft 187
Figure 60. Exploded View of Logic Analyzer 192
Contents
14
Tables
Table 1. Power Cords 26
Table 2. Color Palettes and Mapping of Colors to Display Components 32
Table 3. Threshold Voltage Settings 54
Table 4. Trigger Operators and Sources 75
Table 5. Readout Settings 95
Table 6. HP 54620A/C Factory-Preset Default Configuration Settings 119
Table 7. Sweep Speed and Sampling Interval 130
Table 8. Materials Required (Making Test Connectors) 156
Table 9. Equipment Required (Adjusting Power Supply) 160
Table 10. Equipment Required (Adjusting Display) 162
Table 11. Equipment Required (Troubleshooting Logic Analyzer) 164
Table 12. Display Signals 166
Table 13. Equipment Required (Testing Threshold Accuracy) 169
Table 14. Threshold Test Settings 172
Table 15. Equipment Required (Testing Time Interval Accuracy) 173
Table 16. HP 54620A/C Replaceable Parts 193
Table 17. Input channels 197
Table 18. Horizontal System 198
Table 19. Acquisition System 199
Table 20. Trigger System 200
Table 21. Display System 202
Table 22. Measurement Functions 202
Table 23. Setup Functions 203
Table 24. Power Requirements 203
Table 25. General Characteristics for HP 54620A Only 204
Table 26. General Characteristics for HP 54620A and HP 54620C 205
Table 27. General Characteristics for HP 54620C Only 206
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16
1
Getting Started
Getting Started
When you use the logic analyzer to help test and troubleshoot your
systems, you will follow the general process shown in figure 1:
•Prepare the analyzer by connecting it to power and setting up the
handle and screen brightness as desired.
•Define the measurement problem by understanding the parameters
of the system you wish to test and the expected system behavior.
•Set up channel inputs by connecting the data probes to the
appropriate signal and ground nodes in the circuit under test.
•Define the trigger condition by setting the analyzer configuration to
capture only the system events you wish to view.
•Use the analyzer to acquire data, either in continuous or single-shot
fashion.
•Examine the data and make measurements on it using various
analyzer features.
•Save the measurement or configuration for later re-use or
comparison with other measurements.
The process is repeated as necessary until you verify correct
operation or find the source of the problem.
18
Using the Logic Analyzer
Figure 1
GettingStarted
19
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