HP 54616B Troubleshooting guide
A General-Purpose Oscilloscope
The HP 54615B, HP 54616B, and HP 54616C oscilloscopes offer
exceptional waveform viewing and measurements in a small,
lightweight package. These dual channel, 500 MHz bandwidth
oscilloscopes are designed for use in labs where high speed analog and
digital circuits are being tested. These oscilloscopes give you:
•1 ns peak detect
•1 GSa/s sample rate (HP 54615B)
2 GSa/s sample rate (HP 54616B and HP 54616C)
•500 MHz bandwidth, and 1 ns/div Main and Delayed time bases
•Selectable input impedance
•Protection of the internal 50 ohm load
•Adjustable time nulling to remove the effects of cabling
•250 MHz single-shot bandwidth (HP 54615B)
500 MHz single-shot bandwidth (HP 54616B and HP 54616C)
•Color display (HP 54616C)
These oscilloscopes are very easy to use because of their familiar
controls and real time display. You can discard your viewing hood as
these oscilloscopes have none of the viewing problems that are
associated with analog oscilloscopes. A bright, crisp display is
obtained at all sweep speeds and delayed sweep magnifications.
Storage is as simple as pressing a button. View events ahead of the
trigger using negative time. Cursors and automatic measurements
greatly simplify your analysis tasks.
You can upgrade this oscilloscope for hardcopy or remote control with
the addition of an interface module. Unattended waveform
monitoring and additional waveform math, such as FFT, can be added
with the addition of one of the Measurement/Storage modules.
Bring your scope and PC together with BenchLink software.
BenchLink, which runs under Windows, allows easy transfer of scope
traces and waveform data to your PC for incorporation into
documents or storage.
ii
Accessories supplied
•Two 1.5 meter, 10:1 Rugged 500 MHz Passive Probes (HP 10073A)
•Power cord for country of destination
•This User and Service Guide
•Programmer’s Guide with Microsoft Windows 3.1 Help file, ascii
help file, and sample programs.
Accessories available
•HP 34810A BenchLink/Scope Software (version 1.4 or later)
•HP 54650A HP-IB Interface Module
•HP 54652B Serial/Parallel Interface Module
•HP 54654A Operator’s Training Kit
•HP 54657A HP-IB Measurement/Storage Module
•HP 54659B Serial/Parallel Measurement/Storage Module
•HP 5041-9409 Carrying Case
•HP 5062-7345 Rackmount Kit
•HP 10020A Resistive Divider (1:1 through 100:1) Passive Probe Kit
•HP 10070A 1.5 meter, 1:1 Passive Probe
•HP 10444A 10:1 500 MHz, Low Capacitance Miniature Passive
Probe (1.6 m)
•HP 1137A 1000:1 1 MHz High Voltage Passive Divider Probe
•HP 1141A 1:1 200 MHz Differential Active Probe. Probe power
accessed directly from oscilloscope rear panel.
•HP 1144A 10:1 800 MHz Active Probe. Probe power accessed
directly from oscilloscope rear panel.
•HP 1145A 10:1 750 MHz Small-Geometry Dual Active Probe for
surface mount devices. Probe power accessed directly from
oscilloscope rear panel.
iii
Options available
•Option 001 RS-03 Magnetic Interference ShieldingAdded toCRT
(HP 54615Band HP 54616B only)
•Option 002 RE-02 Display Shield Addedto CRT (HP 54615Band
HP 54616B only)
•Option 005 Enhanced TV/Video Trigger
•Option 101 Accessory PouchandFront-Panel Cover
•Option 103 Operator’s TrainingKit (HP 54654A)
•Option 104 CarryingCase (HP 5041-9409)
•Option 106 BenchLink/Scope Software (HP 34810A)
•Option 090 DeletesProbes
•Option 1CMRackmountKit
•PowerCords(see the table ofReplaceable Parts in chapter 4,
Service)
iv
In This Book
This is the User and Service Guide for
the HP 54615B, HP 54616B, and
HP 54616C Oscilloscopes. This guide
contains five chapters.
First Time Users Chapter 1 is a quick
start guide that gives you a brief
overview of the oscilloscope.
Advanced users Chapter 2 is a series
of exercises that guide you through the
operation of the oscilloscope.
TV/Video triggering Chapter 3 shows
how to use enhanced TV/Video triggering
if you have Option 005 installed in your
oscilloscope.
Service technicians Chapter 4
contains the service information for the
oscilloscope. There are procedures for
verifying performance, adjusting,
troubleshooting, and replacing
assemblies in the oscilloscope.
Reference information Chapter 5 lists
the characteristics of the oscilloscope.
Operating your Oscilloscope
2
UsingOption 005 Enhanced
TV/Video Trigger
3
Service
4
Performance Characteristics
5
Glossary
Index
The Oscilloscope at a Glance
1
v
vi
Contents
1 The Oscilloscope at a Glance
To connect a signal to the oscilloscope 1–5
To display a signal automatically 1–7
To set up the vertical window 1–8
To expand the vertical signal 1–10
To set up the time base 1–11
To trigger the oscilloscope 1–13
To use roll mode 1–16
Using Color (HP 54616C only) 1–17
To select the color palettes and observe colors 1–18
To print in color 1–20
2 Operating Your Oscilloscope
To use delayed sweep 2–3
To use storage oscilloscope operation 2–6
To capture a single event 2–8
To capture glitches or narrow pulses 2–10
To trigger on a complex waveform 2–12
To make frequency measurements automatically 2–14
To make time measurements automatically 2–16
To make voltage measurements automatically 2–19
To make cursor measurements 2–23
To remove cabling errors from time interval measurements 2–27
To view asynchronous noise on a signal 2–28
To reduce the random noise on a signal 2–30
To save or recall traces 2–33
To save or recall front-panel setups 2–34
To reset the instrument setup 2–35
To use the XY display mode 2–36
To analyze video waveforms 2–40
Contents-1
3 Using Option 005 Enhanced TV/Video Trigger
To select TV display grid 3–4
To autoscale on a video signal 3–4
To trigger on a specific line of video 3–5
To trigger on all TV line sync pulses 3–7
To trigger on a specific field of the video signal 3–8
To trigger on all fields of the video signal 3–9
To trigger on odd or even fields 3–10
To make cursor measurements 3–12
To use delayed sweep 3–14
To analyze video waveforms with Option 005 3–16
To window in on harmonic distortion using FFT 3–18
To connect to other instruments 3–20
4Service
To return the oscilloscope to Hewlett-Packard 4–4
Verifying Oscilloscope Performance 4–5
To check the output of the CALIBRATOR 4–6
To verify voltage measurement accuracy 4–8
To verify bandwidth 4–10
To verify horizontal ∆t and 1/∆t accuracy 4–13
To verify trigger sensitivity 4–15
To verify Vertical Output on Option 005 4–18
Adjusting the Oscilloscope 4–21
To adjust the power supply 4–22
To perform the self-calibration 4–25
To adjust the high-frequency pulse response 4–27
To adjust the display (HP 54615B/16B only) 4–29
To adjust the Option 005 offset (R15) 4–31
Contents
Contents-2
Troubleshooting the Oscilloscope 4–32
To construct your own dummy load 4–33
To check out the oscilloscope 4–34
To clear error messages 4–37
To check the Low Voltage Power Supply 4–41
To run the internal self-tests 4–42
To troubleshoot Option 005 4–45
Replacing Parts in the Oscilloscope 4–45
To replace an assembly 4–46
To remove the fan 4–47
To remove the front panel 4–47
To remove the display 4–49
To remove the system board 4–49
To remove the attenuator 4–50
To remove and replace an acquisition hybrid 4–51
To remove and replace a hybrid connector 4–53
To remove the power supply 4–54
To remove the keyboard 4–55
To remove the handle 4–56
To remove the Option 005 board 4–56
To order a replacement part 4–57
5 Performance Characteristics
Vertical System 5–2
Horizontal System 5–4
Trigger System 5–5
TV Functions 5–6
XY Operation 5–6
Display System 5–6
Acquisition System 5–7
Contents
Contents-3
1
Perform self-calibration first
For the oscilloscope to perform most accuratelyin the ambienttemperature
whereit will beused, the self-calibration procedure described on page 4-25
should first be performed. Allow the unit to operate for atleast 30 minutes
before performingtheself-calibration.
The Oscilloscope at a Glance
The Oscilloscope at a Glance
One of the first things you will want to do with your new oscilloscope
is to become acquainted with its front panel. Therefore, we have
written the exercises in this chapter to familiarize you with the
controls you will use most often.
The front panel has knobs, grey keys, and white keys. The knobs are
used most often and are similar to the knobs on other oscilloscopes.
The grey keys bring up softkey menus on the display that allow you
access to many of the oscilloscope features. The white keys are
instant action keys and menus are not associated with them.
Throughout this book, the front-panel keys are denoted by a box
around the name of the key, and softkeys are denoted by a change in
the text type. For example, Source is the grey front-panel key
labeled Source under the trigger portion of the front panel, and
Line is a softkey. The word Line appears at the bottom of the
display directly above its corresponding softkey.
Figure 1-1 is a diagram of the front panel controls and input
connectors.
Figure 1-2 is a status line example. The status line, located at the top
of of the display, lets you quickly determine the setup of the
oscilloscope. In this chapter you will learn to read at a glance the
setup of the oscilloscope from the status line.
Figure 1-3 is a diagram showing which grey keys to press to bring up
the various softkey menus.
1–2
FrontPanel Controls
Display Status Line Indicators
Trigger
controls
Storage
keys
Horizontal
controls
General
controls
Channel
controls
Channel
inputs
External
trigger
control
External
trigger input
Figure 1–1
Channel2 is on, 4 V/div
Main sweep 500 µs/div
Channel 1 is on, ac coupled, inverted, 100mV/div Peak detect is on
Autostore is on
Auto triggered,
positiveslope,
trigger source is channel 1
Delayed sweepis on, 200 ns/div
Figure 1–2
Sample rate display
(Main/Delayed)
1–3
Softkey Menu Reference
Press this key To obtain this menuPress this key To obtain this menu
Figure 1–3
1–4
Toconnect a signal to the oscilloscope
The HP 54615Bis a two-channel,500MHz bandwidth, 1GSa/ssamplerate
oscilloscope withanexternal triggerinput.The HP 54616Band HP 54616C
are two-channel, 500 MHz bandwidth, 2GSa/s sample rateoscilloscopes with
an external trigger input.Theinputimpedance of these oscilloscopesis
selectable– either50Ωor 1 MΩ. The 50Ωmode matches 50Ω cables
commonly used in makinghigh frequency measurements. Thisimpedance
matching gives you the most accurate measurementssincereflections are
minimized along the signalpath.The 1MΩmode is for usewith probesand
for generalpurpose measurements.The higher impedance minimizes the
loading effect of the oscilloscope on the circuit under test. In thisexercise
you connect a signaltothe channel1 input.
To avoid damage toyour new oscilloscope, makesure thatthevoltagelevel of
thesignal youare using is less thanorequal to250 V(dcplus the peak ac).
For a completelist of the characteristics see chapter 5, "Performance
Characteristics."
CAUTION Do not exceed 5Vrms in 50Ωmode. When input protection is enabled in
50Ωmode,the 50Ωloadwilldisconnectif greater than 5 Vrmsisdetected.
However theinputs could still bedamaged, dependingon thetimeconstant
of the signal.
CAUTION The 50Ωinputprotection mode only functions when theoscilloscope
is powered on.
•Use a cable oraprobe to connect a signal to channel 1.
•The oscilloscope hasautomatic probe sensing . If you are using the
probessupplied withthe oscilloscope,or other probeswith probe
sensing, then the input impedance and probeattenuation factors will
be automatically set up by the oscilloscope when automaticprobe
sensing is turnedon.The default settingis to have automaticprobe
sensing on.This is indicatedby theselection of Auto n underthe Probe
softkey, wherenis 1,10, 20, or 100.
•If you arenot using automatic probe sensing,thenfollow these next
twosteps.
The Oscilloscope ata Glance
To connect asignal to the oscilloscope
1–5
•To set the input impedance, press 1 . Select the desired Input
impedance of 50Ωor 1MΩ.
•To set the probe attenuation factor press 1 . Select the Next Menu
softkey. Next toggle the Probe softkey to change the attenuation
factor to match the probe you are using.
You should compensate 10:1 probes to match their characteristics to the
oscilloscope. A poorly compensated probe can introduce measurement
errors. To compensate a probe, follow these steps.
1Connect the 10:1 probe from channel 1 to the front-panel probe
compensation signal on the oscilloscope.
2Press Autoscale .
3Use a nonmetallic tool to adjust the trimmer capacitor on the probe
for the flattest pulse possible as displayed on the oscilloscope.
Overcompensation
causespulsepeaking.
Figure 1–4
Correct compensation
with a flat pulse top.
Figure 1–5
Undercompensation
causes pulserolloff.
Figure 1–6
The Oscilloscope at a Glance
To connect a signal to the oscilloscope
1–6
To display a signal automatically
The oscilloscope has an Autoscale feature that automatically sets up the
oscilloscope to best display the input signal. Using Autoscale requires signals
with a frequency greater than or equal to 50 Hz and a duty cycle greater than
0.5%.
When you press Autoscale , the oscilloscope turns on and scales all
channels that have signals applied, and selects a time base range based
on the trigger source. The trigger source is selected from inputs that
have a signal applied. The priority of trigger source assignment is
External Trigger, input 1, then input 2. Autoscale will, in both 50Ωand
1MΩimpedance modes, reset the Coupling to DC, the Bandwidth Limit
(BWLim) to Off, all Verniers to Off,and Signal Inversion (Invert) to Off.
Input protection in 50Ωmode is not affected by Autoscale.
1Connect a signal to the oscilloscope.
2Press Autoscale .
When you press Autoscale , the oscilloscope changes the front-panel
setup to display the signal. However, if you pressed Autoscale
unintentionally, you can use the Undo Autoscale feature. To use this
feature, perform the following step.
•Press Setup , then press the Undo Autoscale softkey.
The oscilloscope returns to the configuration in effect before you
pressed Autoscale .
The Oscilloscope at a Glance
To display a signal automatically
1–7
To set up the vertical window
The following exercise guides you through the vertical keys, knobs, and
status line.
1Center the signal on the display with the Position knob.
The Position knob moves the signal vertically, and it is calibrated. Notice
that as you turn the Position knob, a voltage value is displayed for a short
time indicating how far the ground reference is located from the center of the
screen. Also notice that the ground symbol on the right side of the display
moves in conjunction with the Position knob.
Measurement hints
If the channel isdc coupled, you can quickly measure the dc component ofthe
signalby simply noting itsdistance from the ground symbol.
If the channel isac coupled, the dc component of the signal is removed allowing
you touse greater sensitivity to display the ac component ofthe signal.
The Oscilloscope at a Glance
To setup the verticalwindow
1–8
2Change the vertical setup and notice that each change affects the
status line differently.
You can quickly determine the vertical setup from the status line in the
display.
•Change the vertical sensitivity with the Volts/Div knob and notice that it
causes the status line to change.
•Press 1 .
A softkey menu appears on the display, and the channel turns on (or
remains on if it was already turned on).
•Toggle each of the softkeys and notice which keys cause the status line to
change.
Channels 1 and 2 have a vernier softkey that allows the Volt/Div knob
to change the vertical step size in smaller increments. These smaller
increments are calibrated, which results in accurate measurements
even with the vernier turned on.
•To turn the channel off, either press 1 a second time or press the
left-most softkey.
Invert operating hint
When youare triggered on the signalyou areinverting,the inversion applies
only tothe displayed waveform, not to the trigger signal. Therefore, the trigger
slope ofthe displayedwaveform is inverted from the trigger slope icon diplayed
on the status line.
The Oscilloscope at a Glance
Toset up theverticalwindow
1–9
To expand the vertical signal
When changing the Volts/Div for analog channels, you can have the signal
expand (or compress) about the center screen or about the ground point.
•To expand the signal about center screen, press Print/Utility .
Then select System Config and Expand Vertical Center.
•To expand the signal about ground, press Print/Utility . Then
select System Config and Expand Vertical Ground.
The Oscilloscope at a Glance
To expand the vertical signal
1–10
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