HP 54645A Manual

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User and
Service Guide
Publication Number 54645-97012
December 1997 (pdf version Nov 1998)
For SafetyInformation, Warranties, and Regulatory information,
seethepagesbehind the Index.
©Copyright Hewlett-Packard Company1996-1997
All RightsReserved
HP 54645A Oscilloscope and
HP 54645D Mixed-Signal
Oscilloscope

The HP 54645A/D at a Glance
Displayshows current input signals
•Eighteen (18) channelsin main mode;
2 scope and 8timing channels in
delayed mode (HP 54645D)
•Indicatorsfor peak, avg, or normal
acquisition,timebase,channel
activity, trigger andacquisition status
•Softkey labels
•Measurement results
Channel Controls select, position, and
labelinputs
•Turn channels onor off individually
or in groups of 8 (HP 54645D)
•Rearrange order ofchannels to
group related signals (HP 54645D)
•Create and display labelsto identify
channels (HP54645D)
General Controls measure, save and
restore results,and configure the
oscilloscope
•Make automatic timeand frequency
measurements
•Usecursors to make manual
measurements
•Save or recall measurement
configurationsor previous results
•Autoscale performssimple
one-button setup ofthe oscilloscope
Horizontal Controls select sweep speed
and delay parameters
•Sweepspeedsfrom5 nsto50s/div
(2 ns to 50s/div for HP54645A)
•Delay control moves waveform
display topoint of interest
•Delayed mode and delay allow
zooming in to showa portion of
waveformindetail(splitscreen)
Storage Keys beginand end data
acquisition
•Run/Stopstartsand stopscontinuous
acquisitions
•Single performs oneacquisition
•Autostore accumulates and displays
the results of multipleacquisitions
•Erase clears the current acquisition
andall accumulated data
TriggerKeys define what data the
oscilloscope willtrigger on
•Source key (HP54645A) allows
conventional oscilloscope triggering
•Edgemode allows triggering on a
positive or negativeedgeof any
single channel (HP 54645A/D)
•Patternmode allowstriggering on a
pattern ofchannels eitherhigh,low,
or don’tcare,with an optional single
edge qualifier (HP 54645D)
•Advancedmode allowssequential
triggers, combined patterns, patterns
andedges,patterndurations,glitch
(HP 54645A/D), and TV (HP 54645D)
Softkeys extend the functionality of
command keys
Selectmeasurementtypes, operating
modes, trigger specifications,label data,
and more
Channel Inputsthrough a flexible
probingsystem
•Sixteenchannels through a dual
8-channelcable with micro-grabbers
(HP 54645D)
•Set logic levels as TTL, CMOS, ECL,
or to a user-definable voltage
(HP 54645D)
ii

In This Book
This manual will guide you in using and
servicing the HP 54645A Oscilloscope
and the HP 54645D Mixed-Signal
Oscilloscope. This manual is organized in
chapters as shown in the bleeder tab
titles to the right.
Front-PanelOverview
2
Triggering HP 54645A/D
Oscilloscopes
3
MegaZoom Concepts and
Oscilloscope Operation
4
Making Measurements with
HP 54645A/D Oscilloscopes
5
UsingOption 005
Enhanced TV/Video Trigger
6
Testing,Adjusting,
and Troubleshooting
7
Replacement Parts
8
Getting Started
1
Performance Characteristics
9
Messages
10
Glossary
Index
iii

iv

Contents
1 Getting Started
Preparing the Oscilloscope 1–4
Check package contents 1–5
Adjust the handle 1–9
Connect the cables 1–9
Power-on the oscilloscope 1–10
Using the digital probes to probe a circuit 1–11
Using the oscilloscope probes 1–13
Adjust display brightness 1–13
2 Front-Panel Overview
Important Oscilloscope Considerations 2–2
HP 54645A/D Front Panels 2–6
Description of Front-Panel Areas 2–8
Front-Panel Operation 2–16
To use oscilloscope channels to view a signal 2–17
To use digital channels to view a signal 2–18
To display signals automatically using Autoscale 2–19
To apply the default factory configuration 2–20
To adjust oscilloscope vertical scaling 2–21
To turn analog channels on and off 2–24
To rearrange the analog channels 2–24
To turn digital channels on and off (HP 54645D) 2–25
To rearrange the digital channels (HP 54645D) 2–26
To operate the time base controls 2–27
To start and stop an acquisition 2–28
To use the Entry and Select knobs 2–29
To make cursor measurements 2–30
To use delayed sweep 2–32
To modify the graticule 2–33
To print the display 2–34
Contents–1

3 Triggering HP 54645A/D Oscilloscopes
Selecting Trigger Modes and Conditions 3–3
To select a trigger mode: Auto Lvl, Auto, Normal 3–3
To use holdoff 3–5
To trigger on a complex waveform 3–6
Triggering the HP 54645A Oscilloscope 3–7
To use external triggering 3–7
To trigger on an edge 3–8
To use glitch triggering 3–9
To use line triggering 3–10
To use TV triggering 3–10
Triggering the HP 54645D Mixed-Signal Oscilloscope 3–11
Trigger types 3–12
To define an edge trigger 3–16
To use line triggering 3–16
To define a pattern trigger 3–17
To use glitch triggering 3–18
To define an advanced pattern trigger 3–19
4 MegaZoom Concepts and Oscilloscope Operation
MegaZoom Concepts 4–3
Deep Memory 4–4
Oscilloscope Responsiveness 4–5
Display Update Rate 4–6
Display Modes 4–7
Pan and Zoom 4–18
Recovering the waveform on the screen 4-21
Changing the time reference position 4–22
Contents
Contents–2

Run/Stop/Single/Autostore/Erase Operation 4–29
Acquiring Data 4–30
Memory Depth/Record Length 4–31
To run and stop an acquisition 4–33
To take a single trace 4–33
To capture a single event 4–34
To use Autostore 4–36
To Autostore Multiple Single Events 4–37
To erase the waveform display 4–38
Using Digital Channels to Probe Circuits 4–39
Saving and Recalling the Configuration 4–43
Using memories to save and recall configurations 4–43
To save, recall, and clear traces 4–46
To save or recall front-panel setups 4–48
To reset the HP 54645A/D instrument setup 4–48
Configuring the Mixed-Signal Oscilloscope 4–51
To change the logic threshold for input signals 4–51
Using Labels on the Mixed-Signal Oscilloscope 4–53
To turn the label display on or off 4–53
To assign a predefined label to a channel 4–54
To define a new label 4–56
To initialize the label list 4–58
5 Making Measurements with HP 54645A/D Oscilloscopes
Capturing Data 5–3
To use delayed sweep 5–4
To view asynchronous noise on a signal 5–6
To reduce the random noise on a signal 5–8
To capture glitches or narrow pulses with peak detect 5–11
To use channel math 5–12
To use the Roll display mode 5–13
Contents
Contents–3

To use the XY display mode 5–14
To analyze video waveforms 5–18
Measuring Waveform Data 5–22
To make cursor measurements 5–22
To make frequency measurements automatically 5–26
To make time measurements automatically 5–28
To make voltage measurements automatically 5–32
6 Using Option 005 Enhanced TV/Video Trigger (HP 54645A)
To autoscale on a video signal 6–4
To trigger on a specific line of video 6–5
To trigger on all TV line sync pulses 6–7
To trigger on a specific field of the video signal 6–8
To trigger on all fields of the video signal 6–9
To trigger on odd or even fields 6–10
To analyze video waveforms with Option 005 6–12
7 Testing, Adjusting, and Troubleshooting
Testing, Adjusting, and Troubleshooting 7–2
Solving Problems with HP 54645A/D Oscilloscopes 7–3
If there is no trace display 7–4
If the trace display is unusual or unexpected 7–5
If you can’t see a channel 7–5
If you can’t get any response from the oscilloscope 7–6
Getting Service 7–7
To return the oscilloscope to Hewlett-Packard 7–8
Verifying Oscilloscope Performance 7–9
To construct test connectors for digital channels 7–9
To test the digital channels 7–11
Contents
Contents–4

Testing Threshold Accuracy 7–12
To set up and connect the equipment 7–13
To verify threshold accuracy 7–14
To check the output of the CALIBRATOR 7–15
To verify voltage measurement accuracy 7–16
To verify bandwidth 7–19
To verify horizontal ∆t and 1/∆t accuracy 7–22
To verify trigger sensitivity 7–24
To verify vertical output on Option 005 7–27
Adjusting the Oscilloscope 7–29
To adjust the power supply 7–30
To perform the self-calibration 7–33
To adjust the low-frequency compensation 7–35
To adjust the high-frequency pulse response 7–36
To adjust the display 7–38
To adjust the Option 005 offset (R15) (HP 54645A) 7–40
Troubleshooting the Oscilloscope 7–41
To construct your own dummy load 7–42
To check out the oscilloscope 7–43
To clear error messages 7–46
To check the Low Voltage Power Supply 7–48
To run the internal self-tests 7–50
To troubleshoot Option 005 7–52
8 Replacement Parts
Removing and Replacing Assemblies 8–3
To remove the cabinet 8–4
To remove the fan 8–4
To remove the front panel 8–5
To remove the display 8–6
To remove the system board 8–6
To remove the front-panel BNC connectors 8–7
Contents
Contents–5