HP 54620A Manual

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1

User and Service Guide
Publication Number 54620-97011
October 1995 (pdf version Dec 1998)
For SafetyInformation, Warranties, and Regulatory information,
seethepagesbehind the Index.
©Copyright Hewlett-Packard Company1994, 1995
All RightsReserved
HP 54620A/C Logic Analyzer

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.
4

Making Analyzer
Measurements
2
Solving Problems
3
Ensuring Accurate
Measurements
4
Glossary
Testing, Adjusting, and
Troubleshooting the Analyzer
5
Replaceable Parts
6
Performance Characteristics
7
Messages
8
Getting Started
1
Index
5

6

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