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

To removethepower supply8–8
To removethekeyboard 8–9
To removethehandle 8–9
Replacing the Option 005 board 8–10
ReplaceableParts8–11
To order a replacement part 8–12
9Performance Characteristics
HP54645A/DOscilloscopes 9–3
HP54645DDigital Channels 9–4
HP54645A/DOscilloscope Digitizing System9–5
HP54645DLogic Digitizing System9–5
HP 54645A/DTime Base 9–6
HP54645A/DOscilloscope TriggerSystem9–7
HP 54645A Oscilloscope TriggerSystem9–8
HP54645DMixed-Signal Oscilloscope TriggerSystem9–8
HP54645A/DSetup Functions 9–9
HP54645A/DPowerRequirements 9–9
HP54645A/DGeneral Characteristics9–10
Option 005General Performance Characteristics 9–11
Option 005 Trigger System9–11
10Messages
Messages 10–3
Glossary
Index
Contents
Contents–6

1
Getting Started

Getting Started
When you use the HP 54645A/D Oscilloscopes to help test and
troubleshoot your systems, you will do the following:
•Prepare the oscilloscope 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 probes to the appropriate
signal and ground nodes in the circuit under test.
•Define the trigger to reference the waveform data to a specific
event of interest.
•Use the oscilloscope to acquire data, either in continuous or
single-shot fashion.
•Examine the data and make measurements on it using various
features.
•Save the measurement or configuration for later re-use or
comparison with other measurements.
Repeat the process as necessary until you verify correct operation or
find the source of the problem.
MegaZoom Technology Operates with Untriggered Data
With the MegaZoom technology built into the HP 54645A/D, you can
operate the oscilloscope with untriggered data. All you do is press Run
or Single while in Auto trigger mode, then examine the data to set up
a trigger.
1-2

The HP 54645A/D high-speed display can be used to isolate
infrequently changing signals. You can then use the characteristics of
these signals to help refine the trigger specification. See figure 1-2
below. For more information on triggering, data acquisition, data
examination and measurement, and configuration, see chapters
3 and 4.
Using the HP 54645A/D Oscilloscopes, and Refining the Trigger Specification
Figure 1-1 Figure 1-2
GettingStarted
1-3

Preparing the Oscilloscope
To prepare your HP 54645A Oscilloscope or HP 54645D Mixed-Signal
Oscilloscope for use, you need to do the following tasks. After you
have completed them, you will be ready to use the oscilloscope.
In the following topics you will:
•Check package contents
•Adjust the handle
•Connect the cables
•Power-on the oscilloscope
•Use the digital probes to probe a circuit (with HP 54645D)
•Use the oscilloscope probes
•Adjust display brightness
1-4

Check package contents
•Verify that you received the following items and any optional
accessories in the HP 54645A/D packaging.
If anything is missing, contact your nearest Hewlett-Packard Sales Office. See
figure 1-3. If the shipment was damaged, contact the carrier, then contact the
nearest Hewlett-Packard Sales Office.
Accessories Supplied Accessories Available
Power cord (seethe following table)
HP 54620-61801 16-channel probe cable (HP 54645D only)
HP 10074A1.5-meter, 10:1 Probe with readout (qty 2)
HP 5090-4356 grabbers (in resealable plastic bag;qty 20)
(HP54645Donly—suppliedwith 16-channelcable)
HP 5959-9334 2" ground lead set (qty 5)
(HP54645Donly—supplied with16-channelcable)
HP 54645A/D User & Service Guide
HP 54645A/D Programmer’s Guide
HP 54645A/D Programmer’s Reference (3.5" diskette)
(diskispackagedwithProgrammer’s Guide)
1252-7310 Banana ground plug (for HP 54645D)
HP54650AHP-IBInterface Module
HP 54652B RS-232/Parallel Interface Module
HP 54654A Operator’s Training Kit
HP54657AMeas./Storage Module (HP-IB)
HP54659BRS-232/Parallel/Meas./Storage Module
HP34810BBenchLinkSoftware forWindows
HP 5041-9409 Carrying Case
HP 5062-7345 Rackmount Kit
HP 10070A 1.5-meter, 1:1 Probe
HP 10100C 50-ΩTermination
Options Available
Option 001 RS-03 Magnetic Interference Shielding Added to CRT
Option 002 RE-02 Display Shield Added to CRT
Option 101 Accessory Pouch and Front-Panel Cover
Option 103 Operator’s Training Kit (HP 54654A)
Option 104 Carrying Case (HP 5041-9409)
Option 106 BenchLink Software (HP 34810B)
Power Cords (see the following table or the
"Replacement Parts" chapter)
GettingStarted
Check packagecontents
1-5

Items Supplied with the HP 54645A/D Oscilloscopes
Figure 1-3
Getting Started
Check packagecontents
1-6

Optional Accessories for the HP 54645A/D Oscilloscopes
Figure 1-4
GettingStarted
Check packagecontents
1-7

Table 1-1
Power Cords
Plug Type Cable Part
No. Plug Description Length in/cm Color
Opt 903 (U.S.A.)
124V** 8120-1378 Straight(NEMA5-15P*) 90/228 JadeGray
Opt900 (U.K.)
250V 8120-1351 Straight (BS136A*) 90/228 Gray
Opt901 (Australia)
250V 8120-1369 Straight (NZSS198/ASC*) 79/200 Gray
Opt902 (Europe)
250V 8120-1689 8120-2857 Straight(CEE7-Y11*) Straight(Shielded) 79/200 79/200 Mint Gray Coco Brown
Opt906 (Switzerland)
250V 8120-2104 Straight (SEV1011*) 79/200 Mint Gray
Opt912 (Denmark)
220V 8120-2957 Straight(DHCK107*) 79/200 Mint Gray
Opt 917 (Africa)
250V 8120-4600 Straight (SABS164) 79/200 Jade Gray
Opt918 (Japan)
100V 8120-4753 Straight Miti 90/230 Dark Gray
* Part number shown for plug is industry identifier for plug only.
Number shown for cable is HP part number for complete cable including plug.
** These cordsare included in the CSA certificationapproval for the equipment.
Getting Started
Check packagecontents
1-8

Adjust the handle
Connect the cables
1Check to ensure that you received everything that is supplied with
the oscilloscope.
2Connect the oscilloscope to power and turn it on.
3Connect the cables:
If you are using this model: Do this:
HP 54645A Oscilloscope Connect theoscilloscope probe cables to oscilloscope
channels 1 and 2.
HP 54645D Mixed-Signal
Oscilloscope Connect the oscilloscope probecables tooscilloscope
analog channels A1 and A2.
Connect thedigital probe cable tooscilloscope digital
channelsD0-D15.
4Then, connect the scope and/or digital probes to the circuit of
interest. Be sure to connect the ground leads.
You can use the front-panel calibration point as a stimulus while learning to
use the oscilloscope.
1Grasp the handle pivot points on each side of the
instrument and pull the pivot out until it stops.
2Without releasing the pivots, swivel the handle to
the desired position. Then release the pivots.
GettingStarted
Adjustthe handle
1-9