HP 16534A Service manual

User’s Reference
Publication Number 16534-97009
February 1999
For Safety Information, Warranties, and Regulatory
Information, see the pages behind the Index
Copyright Hewlett-Packard Company 1991 – 1999
All Rights Reserved
HP 16533A 1-GSa/s and
HP 16534A 2-GSa/s Digitizing
Oscilloscope

The HP 16533/34A Digitizing Oscilloscope
The HP 16533/34A is a digitizing oscilloscope module for the HP
16500B/C logic analysis system. With a bandwidth of up to 500 MHz
and a sampling rate up to 2 GSa/s, you can make accurate
measurements on high speed digital circuits with rise times as fast as
1.5 ns.
When configured with other measurement modules in the
HP 16500B/C logic analysis system, cross-domain measurements are
time-correlated and displayed together on the same screen.
Memory depth of 32 KBytes per channel allows the HP 16533/34A to
capture a sufficiently long analog record prior to trigger. A long
record allows adequate time resolution to identify errors confidently.
Configuration
Either model can be used as a single-card module or in a multi-card
module configuration. For each card configured into a multi-card
module, you gain two signal inputs up to a maximum of eight channels
(four-card module).
ii

Compatibility
If you are upgrading from the HP 16532A, the following compatibility
issues should be noted:
•If an HP 16532A file is loaded into an HP 16533/34A, the
HP 16533/34A will set up identically. However, the HP 16532A data
will not be read or displayed.
•The HP 16532A cannot load files that were stored from an
HP 16533/34A.
•You cannot mix HP 16532A and HP 16533/34A cards in a multi-card
module.
The HP 16533/34A Oscilloscope
iii

In This Book
This book provides a detailed description of the features of the HP
16533/34A digitizing oscilloscope modules. It identifies the different menus
available on the oscilloscope, and shows what options are available in the
menus. It then explains what each of these options mean and what they do.
The book is divided into the following chapters:
Chapter 1 describes the options for running and stopping the oscilloscope
and explains single and repetitive modes of operation.
Chapter 2 describes the Autoscale function—what is does, what trigger it
selects to trigger on, and what fields and menus are affected by the
algorithm.
Chapter 3 describes the Channel menu options—input identification, vertical
sensitivity and position, probe attenuation factor, coupling field selection,
and preset values.
Chapter 4 describes time base functions—sweep speed, horizontal position,
pan and zoom, and sample period display.
Chapter 5 describes time marker functions—both manual and automatic. It
describes the capabilities of both manual and automatic time markers and
the fields available in each, then describes the function of each of these
fields. It also decribes voltage markers, the fields available to them, and the
function of each of these fields.
Chapter 6 describes trigger options available—immediate, pattern, and edge.
It describes their use, configurations available, and the fields controlling
each option.
Chapter 7 describes the display options—normal, average, and accumulate.
It then explains when each is used, and what the results are when each is
used.
Chapter 8 describes the Auto-Measure feature and explains the algorithm for
each of the nine automatic measurements taken. The measurements taken
using this feature are: frequency, period, peak-to-peak voltage, positive pulse
width, negative pulse width, rise time, fall time, preshoot, and overshoot.
iv

Chapter 9 describes the Waveform
Selection menu. This menu lets you
select the following modes of operation:
single channel, overlay,
Chan + Chan, or Chan−Chan. It also
allows you to insert, replace, or delete
channels from the display.
Chapter 10 gives you the specifications
and characteristics for the oscilloscope.
Chapter 11 describes the module
installation and bench service procedures.
The Index is an alphanumeric listing of
the subject matter contained in this book.
The Glossary defines some of the
common terms you will find throughout
this book.
Run/Stop Options
1
TheChannel Menu
3
Autoscale
2
Time Base Functions
4
The Marker Menu
5
TheTriggerMenu
6
The Display Menu
7
The Auto-Measure Menu
8
The Waveform Selection Menu
9
Specifications and
Characteristics
10
Installation and Operator’s
Service
11
Index
Glossary
v

vi

Contents
1 Run/Stop Options
Run/Stop Options 1–2
Autoscale Run 1–3
Run Field 1–3
Stop Field 1–4
2 Autoscale
Autoscale Field Options 2–3
Autoscale Algorithm 2–4
Menus and Fields Changed by the Autoscale Algorithm 2–6
3 The Channel Menu
Input Field 3–4
V/Div Field 3–5
Offset Field 3–6
Probe Field 3–7
Coupling Field 3–7
Preset Field 3–8
4 Time Base Functions
s/Div Field 4–3
Delay Field 4–5
Sample Period Field 4–8
5TheMarkerMenu
Manual Time Markers Options 5–5
Tx to To Field 5–6
Trig to X Field 5–7
Trig to O Field 5–8
Channel Label Field 5–8
T Marker Value Display 5–9
Contents–1

Automatic Time Marker Options 5–10
Done Field 5–11
Set on Field 5–11
Type Field 5–11
at Level Field 5–12
Slope Field 5–13
Occur Field 5–13
Statistics Field 5–14
Run Until Time X-O Field 5–15
Manual/Automatic Time Markers Option 5–17
Setting the Manual/Automatic Time Markers Option 5–17
Voltage Markers Options 5–18
Va On Field 5–19
Va Volts Field 5–19
Vb On Field 5–20
Vb Volts Field 5–20
Va to Vb Field 5–21
Center Screen Field 5–21
V Marker Value Display 5–22
6 The Trigger Menu
Trigger Marker 6–4
Edge Trigger Mode 6–5
Source Field 6–6
Level Field 6–7
Slope Field 6–9
Count Field 6–9
Auto-Trig Field 6–10
Pattern Trigger Mode 6–11
Channel/Pattern Field 6–12
Contents
Contents–2

When Field 6–13
Count Field 6–16
Auto-Trig Field 6–17
Immediate Trigger Mode 6–18
Intermodule Measurements 6–19
7TheDisplayMenu
Mode Field 7–4
Connect Dots Field 7–6
Grid Field 7–7
Acquisition Time Field 7–8
Display Options Field 7–8
8 The Auto-Measure Menu
Automatic-Measurement Fields 8–4
Input Field 8–4
Automatic Measurements Display 8–4
Automatic Measurement Prerequisites 8–5
Measurement Setup Requirements 8–5
Criteria Used for Making Automatic Measurements 8–6
Automatic Measurement Algorithms 8–7
Top and Base Voltages 8–7
Measurement Algorithms 8–8
9 The Waveform Selection Menu
Module Field 9–4
Channel Mode Field 9–5
Action Field 9–9
Delete All Field 9–10
Contents
Contents–3

Delete Field 9–10
Labels Field 9–10
Waveform Size Field 9–11
Done Field 9–11
10 Specifications and Characteristics
Operating System 10–3
Specifications 10–3
Characteristics 10–4
Supplemental Characteristics 10–6
11 Installation and Operator’s Service
To inspect the module 11–3
To prepare the mainframe 11–3
To install the module 11–5
To configure the HP 16533/34A module 11–6
To reconfigure a multi-card module into single-card modules 11–8
To turn on the system 11–8
To test the module 11–8
To clean the module 11–8
Calibrating and Adjusting 11–9
Calibration frequency 11–9
Multi-card oscilloscope calibration 11–9
To calibrate the oscilloscope 11–10
Set up the equipment 11–10
Self Cal menu calibrations 11–12
Protect the operational accuracy calibration factors 11–15
Index
Glossary
Contents
Contents–4

1
Run/Stop Options

Run/Stop Options
When you first turn on the Logic Analysis System, all of the modules
installed in the mainframe are inactive (that is, not running). Making
the module inactive at system start-up prevents any unwanted
interaction between the modules.
This chapter describes how to manually start the oscilloscope
running. You can cause the oscilloscope to run automatically in an
intermodule measurement setup. For information on intermodule
measurements, refer to the "Intermodule Measurements" chapter in
the HP 16500B/16501A Logic Analysis System User’s Reference or
the "Correlating Measurements" chapter in the HP 16500C/16501A
Logic Analysis System User’s Reference.
Manually running or stopping the oscilloscope is controlled by the
Run/Stop field. All of the run and stop options are explained in this
chapter. The Run/Stop field is in the upper-right corner of all
oscilloscope menus.
Remember, when the Run/Stop field displays Run, the oscilloscope is
stopped. You touch the Run field to start the oscilloscope running.
Likewise, when the Run/Stop field displays Stop, the oscilloscope is
running. You touch the Stop field to stop the oscilloscope. In short,
the Run/Stop field displays your next option—not the action taking
place.
1-2

Autoscale Run
You can use the autoscale feature to cause the oscilloscope to run. You may
want to use this method when you have changed one or more of the signal
input parameters and want to get back to a basic screen presentation of your
waveform. Touch the Autoscale field on the screen, then select Continue
from the pop-up menu. When autoscaling is complete, the oscilloscope
automatically starts running. It will run in the mode (single or repetitive)
that was last selected using the Run field menu options. If no run mode is
selected prior to selecting autoscale, the run mode defaults to single mode.
Run Field
When the green Run field is displayed, the oscilloscope is stopped. Touching
the Run field, then removing your finger from the screen, starts the
oscilloscope running. The oscilloscope runs using the parameters that are
currently set. Additionally, it runs in the mode (single or repetitive) that was
last selected. If no run mode is selected prior to selecting a run, the run
mode defaults to single mode.
When you touch and hold your finger on the Run field, a pop-up menu
appears. The pop-up contains the selections Single, Repetitive, and Cancel.
To select one of the options, slide your finger down the screen until it is over
the option you want to select, then remove your finger from the screen.
These options are described in the following paragraphs.
Single Mode Option
When the system is turned on, the oscilloscope defaults to the Single mode.
Single-mode acquisition fills acquisition memory once with 32768 samples of
the input waveform, automatically stops running, then displays the contents
of acquisition memory. Each 32768-sample waveform record is acquired in a
single acquisition.
Run/Stop Options
Autoscale Run
1-3

To start the oscilloscope running in the single-mode after it has been running
in repetitive mode, touch the green Run field. Slide your finger down to the
Single field in the pop-up until the Single field turns white, then remove your
finger from the screen. This starts the oscilloscope running in the Single
mode. When single-shot acquisition is in process, the Run/Stop field will
display Stop. When the acquisition is complete, the field display changes to
Run. In Single mode, the oscilloscope makes a single acquisition and
displays the results. The oscilloscope then waits until the Run field is
touched again before making another acquisition.
Repetitive Mode Option
Repetitive mode acquisition fills acquisition memory with 32768 samples of
the input waveform on continuing acquisitions. The display is updated each
time a new acquisition is made. Repetitive mode continues acquiring data in
this manner until you touch the Stop field. As in single mode, each
32768-sample waveform record is acquired in a single acquisition.
To start the oscilloscope running in the repetitive mode after it has been
running in single mode, touch the green Run field. Slide your finger down to
the Repetitive field in the pop-up until the Repetitive field turns white, then
remove your finger from the screen. This starts the oscilloscope running in
the Repetitive mode. While the real-time repetitive acquisitions are being
made, the Run/Stop field will display Stop. When you want to stop making
repetitive acquisitions, touch the Stop field. To resume making repetitive
acquisitions, touch the Run field again.
Cancel Option
If you select the Cancel field in the pop-up, the oscilloscope returns to the
state it was in before the Run field was touched. That is, it is stopped in
either single or repetitive mode, whichever mode was selected last.
Stop Field
When the red Stop field is displayed, the oscilloscope is running. Touch the
Stop field to cause the oscilloscope to stop running.
Run/Stop Options
Stop Field
1-4

2
Autoscale

Autoscale
Autoscale is an algorithm built into the oscilloscope that automatically
optimizes the display of one or more waveforms. When you touch the
Autoscale field and select Continue, the autoscale algorithm starts,
and the screen displays the advisory message "Autoscale is in
progress."
This chapter discusses how the autoscale algorithm works. It also
discusses what fields are affected by the autoscale algorithm.
2-2

Autoscale Field Options
The Autoscale field is displayed in the top row of menu fields on every
oscilloscope menu.
When you touch the Autoscale field, a pop-up appears that allows you to
cancel or continue the autoscale.
Cancel
If you accidentally touch the Autoscale field, you can touch the Cancel field
in the pop-up menu to cancel the autoscale process. The cancel feature
keeps you from inadvertently changing your oscilloscope setup.
Continue
When you touch the Continue field, the autoscale algorithm starts, and the
screen displays the advisory message "Autoscale is in progress." Once the
autoscale operation begins, it cannot be canceled.
Autoscale
Autoscale Field Options
2-3

Autoscale Algorithm
This section describes what the autoscale algorithm does when a signal, or
signals, is present at the oscilloscope inputs. It also describes what occurs
when signals are not present at the oscilloscope inputs.
What the Autoscale Algorithm Does When a Signal is Found
The autoscale algorithm first checks all input channels to determine whether
or not there are any signals present. The vertical scaling is then set as
required for each channel. Next the time base is scaled for a single input
channel. Finally, the trigger channel is selected and the waveforms are
displayed.
Finding the Vertical Settings The autoscale algorithm first checks all
input channels to determine whether or not there are any signals
present. Starting at the lowest numbered channel in the oscilloscope
module, the autoscale algorithm checks for activity on that channel. It
then sets the vertical scaling (V/Div and offset) appropriate to that input
signal. This process is repeated for each input channel. If no activity is
found on an input channel, the original (pre-autoscale) vertical settings
are restored.
When all input signals have been vertically scaled, the time base settings
(s/Div and delay) are scaled. The time base settings are determined based
on the input signal for a single channel.
Finding the Time Base Settings The time base settings (s/Div and
delay) are determined based on the input signal of the lowest numbered
input channel that has been determined to have a signal present.
For example, if signals are present on both channel 1 and channel 2 inputs,
the autoscale algorithm selects the signal on channel 1 input as the time base
scaling source. Similarly, if a signal is present only on the channel 4 input,
then the channel 4 input is selected as the time base scaling source.
The time base is scaled so that between two and five complete cycles of the
source input signal can be seen on the screen. If signals of significantly
different frequencies are probed by the oscilloscope, and the time base
scaling is based on a slow signal, you should be aware of the possibility that
the faster signals may be under-sampled and incorrectly displayed on the
screen.
Autoscale
AutoscaleAlgorithm
2-4

Displaying the Waveform When the autoscale algorithm is complete,
the oscilloscope automatically starts running, and displays waveforms
for the inputs that have been selected. The run mode (single or
repetitive) that was selected prior to running autoscale is the run mode
executed when autoscale is completed. If a run mode has not been
selected prior to running autoscale, the single mode run is executed.
The channel and time base fields are updated (if necessary) to reflect any
changes made by the autoscale algorithm. The trigger settings are also
changed by the autoscale algorithm and an edge mode trigger with channel 1
or channel 2 is selected. The trigger source is set to channel 1 or channel 2.
Even if the scaling is based on a higher-numbered channel, it will not be
used as the trigger source. Instead, the trigger source will default to channel
1.
The trigger point on the waveform is determined by the trigger level set by
the autoscale algorithm. The trigger point is displayed as a dotted vertical
red line at the center of the screen when Delay is set to 0 s.
What the Autoscale Algorithm Does When a Signal Cannot be Found
When a signal cannot be found on any of the vertical inputs, the oscilloscope
displays the advisory messages "No signal found" and "Original setup
restored." The autoscale algorithm toggles the Auto-Trig field to On, which
places the oscilloscope in the automatic trigger mode. The oscilloscope
then displays the message "Auto triggered." The automatic trigger mode
allows the oscilloscope to sweep automatically and to display a baseline
anytime a trigger signal is not present.
Autoscale
Autoscale Algorithm
2-5

Menus and Fields Changed by the Autoscale Algorithm
The following table shows the menus and their fields that are changed
by the autoscale algorithm.
Settings Changed by Autoscale
Menu Field Autoscale Action
Channel V/Div
Offset Scaled -depending on amplitude of input signal. Scaled -depending on offset of input signal.
Trigger Mode
Source
Level
Slope
Count
Auto-Trig
Defaults toEdge.
Either channel 1 or channel2. If no input signalexists for channel 1 orchannel 2, it
defaults to channel 1.
Scaled -depending on amplitude of lowest numberedinput with signal present.
Defaults to Positive.
Defaults to 1.
Defaults to On.
All Applicable s/Div
Delay Scaled -depending on frequency of lowest numbered input withsignal present. Defaults to 0 s.
Autoscale
Menus andFields Changed by the Autoscale Algorithm
2-6