Agilent 54645A Training Guide

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Training Guide

Publication number 54654-97008

May 1996 (pdf version Dec 1998)

For Safety Information, Warranties, and Regulatory information, see the pages behind the Index.

HP 54654A Self-Paced Training Kit for HP 54600-Series Instruments

HP 54600-Series Instruments – a self-paced training guide

This booklet and its accompanying signal board will acquaint you quickly with the features and operation of the HP 54600-Series of basic oscilloscopes, the HP 54645A oscilloscope with HP MegaZoom technology, the HP 54620A/C logic analyzer, and the HP 54645D mixed signal oscilloscope. After you have completed the exercises, you will have used most of the major features of these instruments. You will see how similar the digital oscilloscope is to analog oscilloscopes that you have used in the past, and you will experience many of the advantages that digitizing architectures bring to today’s oscilloscopes. Using the logic analyzer, you will see how similar it is to the oscilloscope you’re familiar with, and how much more power it has for troubleshooting and debugging digital circuits. Using the mixed signal oscilloscope you will be able to make measurements on both analog and digital parts of your circuit using one instrument.

HP 54600-Series Basic Oscilloscopes

The HP 54600-Series basic oscilloscopes are simple, easy-to use oscilloscopes that are the solution of choice for troubleshooting devices that contain a mixture of analog and digital technology.

The HP 54600-Series oscilloscopes feature highly interactive displays, which mean that signal changes are instantaneously displayed in real time. This rapid display update speed simplifies adjustments by eliminating the lag time between making changes and observing the results. Also, rapidly changing signals, like amplitude modulation are displayed as expected.

Direct, responsive controls let you access and manipulate the powerful features with a minimum of menu layers. The intuitive interface insures a short learning curve, allowing you to be up and running quickly, whether you are a brand-new oscilloscope user, or an experienced user switching from an analog oscilloscope.

HP 54654A Training G ui de

Introduction

Powerful digital features such as negative time, storage, measurement automation, hard copy, and computer control solve your most difficult test problems. HP’s advanced integrated circuit technology puts analog look and feel together with digital power in a small-size, lightweight package, ideal for your troubleshooting needs.

Unique three-processor architecture in these oscilloscopes produces bright, crisp, high-fidelity displays of the most demanding signals all sweep speeds and delayed sweep magnifications. Storage for glitch and transient analysis, is as simple as pressing a button. Negative time lets you view events that would be missed by analog oscilloscopes.

The HP 54645A version is also enhanced with HP MegaZoom technology. This technology, based on multiple processor architecture, gives the HP 54645A version oscilloscope the ability to capture long records and still remain highly responsive to control inputs and have exceptionally high speed display response. The HP MegaZoom technology guarantees that waveform acquisition, storage and display tasks are performed by processors that are optimized for their work.

Materials needed for basic oscilloscope exercises

One HP 54600-series oscilloscope.

•

Two HP 10071A 10:1 probes, or equivalent (supplied with the instrument)

•

One HP 54654-66502 training board and 9-volt battery (both are provided

•

in the HP 54654A Training Kit).

This Training Guide (part number 54654-97008).

•

The HP 54645D Mixed Signal Oscilloscope

The HP 54645D Mixed Signal Oscilloscope (MSO) is the all-in-one answer for mixed signal testing. Combining powerful digital oscilloscope features with equally powerful logic analyzer features provides a seamlessly integrated solution that guarantees quick troubleshooting and debugging.

On one highly interactive display, you can see both the analog circuit operation displayed on the 100 MHz oscilloscope channels and the logic timing displayed on up to 16 logic channels. These two views of the circuit’s operation are aligned in time so that events viewed in one can be related to the other. The MSO also has a control panel that is direct and easy to use.

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HP 54654A Training Guide

Introduction

Simple scope-like knobs control both the scope and logic channels. This intuitive interface guarantees access to powerful features with a minimum of menu layers.

As with all HP 54600 instruments, the MSO setup is simplified with the powerful Autoscale operation. Autoscale turns on and displays all channels that have activity. The time base is set to show an optimally-scaled display of the analog channels and the digital timing.

HP MegaZoom technology, based on multiple processor architecture, gives the HP 54645D the ability to capture long records and still remain highly responsive to control inputs and have exceptionally high speed display response. The technology guarantees that waveform acquisition, storage and display tasks are performed by processors that are optimized for their work. This eliminates the long waits commonly associated with troubleshooting a mixed signal system.

Powerful triggering capabilities let you solve a wide range of triggering problems. Simple oscilloscope-like edge triggering is useful for most everyday uses. Pattern triggering allows you to set a pattern of high, low, and don’t care levels across 18 channels. Advanced trigger modes give you the choice of glitch, TV and advanced pattern triggering. In advanced pattern trigger mode, you can search for a combination of two trigger pattern terms, which can then be combined in one of several Boolean relations.

Materials needed for the HP 54645D mixed signal oscilloscope exercises

One HP 54645D mixed signal oscilloscope.

•

Two HP 10074A 10:1 probes (or equivalent)

•

One HP 54654-66502 training board and 9-volt battery (both are provided

•

in the HP 54654A Training Kit).

This Training Guide (part number 54654-97008).

•

HP 54654A Training G ui de

Introduction

HP 54600-Series Logic Analyzers

If you are an oscilloscope user, you already know how to operate these logic analyzers. The HP 54620A/C 16-channel, 500-MSa/s logic analyzer is designed to be used with your oscilloscope to quickly troubleshoot and debug your mixed-signal and digital circuits.

This logic analyzer has a control panel that is very much like that of your oscilloscope. You can simply turn a knob to change the time per division, reposition a channel in the display, or enter a duration value.

The logic analyzer setup is simplified with the powerful Autoscale operation. Autoscale turns on and displays all channels that have activity. The time base is set to show an optimally-scaled display of all of the active signals. The undo Autoscale option in the save/recall setup returns the logic analyzer to the setup used before the last Autoscale.

Oscilloscope-like triggering is provided in the edge triggering mode. Pattern mode extends triggering capability to be a pattern of high, low, and don’t care levels across all of the 16 input channels, as well as the external trigger input port; you can qualify this pattern with an edge. Advanced trigger mode is useful in applications where you need more triggering power to isolate the event of interest.

The HP 54620A/C logic analyzer uses an advanced four-processor architecture. This provides a powerful instrument that can display changing waveforms in your system that would be missed by more traditional analyzers. Another benefit of the high-speed display system is that the HP 54620 responds instantly to your control inputs entered on the front panel.

Materials needed for the logic analyzer exercises

One HP 54620 logic analyzer and probes.

•

One HP BNC cable, approximately 1 meter long (HP 10503A or

•

equivalent).

One HP 54654-66502 training board and 9-volt battery (both are provided

•

in the HP 54654A Training Kit).

This Training Guide (part number 54654-97008).

•

HP 54654A Training Guide

Introduction

The Training Signal Board

The training signal board has a battery, data probing points, an on/off switch, potentiometers, and scope and analyzer test points.

CAUTION

The training signal board has components that can be damaged by electrostatic discharge. Before you touch the board, touch the battery holder first. Also, when you pick up the board, it is safest to grasp it by the battery and holder. When you connect oscilloscope probes to the board, connect the probe ground lead to the board’s ground test point first. This way, any charge on the probe is safely grounded so that it cannot damage delicate components when you connect to a signal test point.

Figure 1

Data p o ints probed in the exercises

On/off pushbutton switch and LED

Test points (1-14)

HP 54654A Training G ui de

Introduction

Training Boa rd component locat or

The battery

A standard 9-V alkaline battery is used to power the training signal board. The battery is shipped disconnected from the board, because even with the power turned off, there is a current drain of about 80 µA. Normally, with the battery installed, it will have a shelf life of at least eight months. When the board is turned on, the battery drain is about 5 mA, which provides over 100 hours of operation. The red LED begins flashing when there are about 10 hours of operation remaining. The signal board has a “battery saver” feature that automatically turns the power off after two hours of use. If the power turns off during use, simply press the on/off pushbutton to restore operation.

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HP 54654A Training Guide

Introduction

Signal outputs and controls

On the edge of the training signal board there are fourteen test points and two grounds. Next to each of the test points is a graphical representation of the signal that is available at that test point.

Near the center of the board are the logic analyzer test points on two 0.1" center-post connectors. These test points are labeled D0 through D13, and include multiple grounds (GND).

Output impedance for digital waveforms is 316 Ω; output impedance for analog waveforms are as high as 50 kΩ. It is important that you use high impedance 10:1 probes, not 1:1 probes, to connect to the board. The 1:1 probes have high-input shunt capacitance which overloads the outputs, causing distortion.

Waveforms available from this board are typical of those encountered in both real-life digital and analog circuits. Exact waveforms will vary slightly from board to board.

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Test Point Waveform Description

1 Square wav e, 500 kHz, 3. 7 Vp-p.

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Introduction

3 Complex pulse train with puls es of various wi dths and variable time spacing;

4 Same as test poi nt 3, but w ith an additional nar row gl i tch pulse occurrin g at a

5 Pulse with period of 28.2 µs, 3.7 Vp-p, and dut y cycle of 6.6% .

7 Noisy stair st ep with glitches; height of each st ep is about 65 m V, peri od 7.5 µs.

9 Single-shot pu ls e act i vated by a momentary-contact pushbutton near the tes t

10 Single-shot pulse, similar to that on test point 9 but with ringing on the pulse

Square wave, same as test point 1, but del ayed in time by a partial period.

pulse train rep eats every 28. 6 µs, 3.7 Vp-p.

lower repetitio n rat e.

Narrow pulse with low duty cycle, period 6.4 ms, width 325 ns.

Slow saw tooth w aveform, period 1 .6 s, 1. 2 Vp-p.

point; width 90 µs, 3.6 Vp-p.

top; ringing fre quency about 19 0 kHz.

11 Noisy si ne w ave; frequency 1. 1 kHz, 1.4 Vp-p.

12 Variable am pl itude sine wave; frequency 1.1 kH z; amplitude is varied by turning

a potentiometer near the test point .

13 Sine wave is similar to that available on test point 12, but with variable phase

shift referenced to the test poi nt 12 waveform. Phase s hi ft i s varied by turning a potentiometer near the test point .

14 Modulated carrier waveform; carrier frequency about 260 kHz, mod ul ating

frequency abou t 1 .1 kH z .

HP 54654A Training Guide

Introduction

Concepts and features

We have carefully designed the HP 54600-oscilloscopes and logic analyzers to make them look and feel like the instruments that most oscilloscope users already know how to use.

The front panels have knobs, grey keys, and white keys. The knobs are used most often and are similar to knobs on oscilloscopes. To reduce the number of pushbuttons, grey keys on the front panel bring up softkey menus at the bottom of the display. Each of the softkeys just below the display corresponds to a menu item just above on the display. The white keys are instant action keys which do not have associated menus.

Throughout this book, 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, panel, and

Source

Patter n

is a softkey. The word “

is a grey key in the trigger portion of the front

” is at the bottom of the

Source

display directly above a softkey. The function of the softkeys change as you press other front-panel keys.

The status line, located at the top of the display, lets you quickly determine the setup of the instrument, including the sampling rate, whether the instrument is in glitch mode, the time/division setting, the trigger mode, Autostore status, and whether the measurement is running or stopped.

Figure 2

HP 54654A Training G ui de

Introduction

Status Disp l ay Area

Softkeys

Autoscale Key

The HP 54602B front panel

Figure 3

HP 54654A Training Guide

Introduction

Storage

selections Horizontal controls

Trigger selections

Softkeys

The HP 54645A front panel

Power switch

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Measurement controls

External Trigger

Figure 4

Horizontal controls

HP 54654A Training G ui de

Introduction

Storage selections

Trigger selections

Softkeys

The HP 54645D front panel

Power switch

Measurement controls

Channel

and label

controls

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Figure 5

Softkeys

HP 54654A Training Guide

Introduction

Storage selections

Trigger selections

Horizontal controls

Channel and label controls

Trigger out

Power switch

The HP 54620A front panel

Measuremen t controls

Channel probes with labels

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In This Book

This book is a self-paced training guide to quickly acquaint you with HP 54600-Series Oscilloscopes, the HP 54645D mixed signal oscilloscope, and the HP 54620A/C logic analyzers. You will learn how to set up these instruments and begin making measurements right away.

Getting Started

Basic Oscilloscope Operations

Using HP MegaZoom

Technology

Mixed Signal Oscillosco pe

Exercises

Digital Circuitry Measurem ent

Exercises

Getting Started

Chapter 1 shows you how to get started with your particular instrument, including how to:

Install the battery.

•

Turn on the training board

•

Turn on the oscilloscope or logic

•

analyzer.

Basic Oscilloscope Operations

Chapter 2 shows you how to:

Use basic oscilloscope operations.

•

Make measurements.

•

Use the trigger holdoff.

•

Use storage operations.

•

Use advanced oscilloscope operations.

•

Using MegaZoom Technology

Chapter 3 shows you how to make the most of the HP MegaZoom technology if you are using the HP 54645A oscilloscope or the HP 54645D mixed signal oscilloscope.

Index

HP 54654A Training Guide

Introduction

Mixed Signal Oscilloscope Exercises

Chapter 4 shows you how to make the most of the combined oscilloscope features and the logic analysis features in the HP 54645D mixed signal oscilloscope. This chapter shows you how to:

Use basic logic analysis features of the mixed signal oscilloscope.

•

Make measurements.

•

Capture and measure a glitch.

•

Use the logic analysis and oscilloscope features together.

•

Digital Circuitry Measurement Exercises

Chapter 5 shows you how to:

Use basic logic analyzer operations.

•

Use the logic analyzer to make measurements in four exercises.

•

Connect the logic analyzer probes to the training board.

•

Display, reorder, and label channels.

•

Use cursors and the measurement capability.

•

Use the Autostore feature.

•

Capture and measure the width of a glitch.

•

Connect to and trigger the oscilloscope.

•

If you need more details on operation, refer to the User and Service Guide supplied with your oscilloscope or logic analyzer.

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Which exercises are for you

HP 54654A Training G ui de

Introduction

Chapter 1 Ge tting Started with...

Chapter 2 Basi c Oscilloscope Operations

Chapter 3 HP MegaZoom Technology

Chapter 4 Mixed Signal Oscilloscope Exercises

Chapter 5 Digit al Circuitry Measureme nt Exercises

...the HP 54600 series* Basic Oscilloscope

...the HP 54645D Mixed Signal Oscilloscope

...the HP 54620A/ C Logic Analyzer

Entire chapter

HP 54600-Series* Basic Oscilloscope

√√

√√ √

HP 54645A with HP MegaZoom Technology

√√

HP 54620A/C Logic Analyzer

√

HP54645D Mixed Signal Oscilloscope

√

*Note: In this table , HP 54600-Series Basic Oscil lo scopes are the fol l ow i ng: H P 54600B, HP 54601B, HP 54602B, HP 54603B, HP 54610B, HP 54615B, and H P 54616B/C.

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xviii

1 Getting Started

Getting started with the HP 54600 Basic Oscilloscopes or the

HP 54645A Oscilloscope 1–3

Install the battery 1–3 Turn on the board 1–4 Turn on the oscilloscope 1–4 Set up the oscilloscope in a default state 1–4 Display a waveform 1–5 Set the probe attenuation factor 1–6 Compensate your probes 1–7 View a signal on the training signal board 1–8 The Next Step: Selecting exercises for HP 54600 Basic Oscilloscopes or the

HP 54645A Oscilloscopes 1–9

Getting Started with the HP 54645D Mixed Signal Oscilloscope 1–10

Install the battery 1–10 Turn on the board 1–11 Turn on the oscilloscope 1–11 Set up the oscilloscope in a default state 1–11 View a signal on the training signal board 1–12 The Next Step: Selecting exercises for the HP 54645D Mixed Signal

Oscilloscope 1–12

Getting Started with the HP 54620A/C Logic Analyzer 1–13

Install the battery 1–13 Turn on the training board 1–14 Turn on the Logic Analyzer 1–14 Probe the signals and apply power 1–14 View the status line and corresponding controls 1–15 The Next Step: Selecting exercises for the HP 54620A/C Logic Analyzer 1–16

Contents–1

Contents

2 Basic Oscilloscope Operations

Who should do these exercises? 2–3

Using Oscilloscope Operations 2–4

Set up the vertical 2–4 Set up the main time base 2–6 Use the delayed time base 2–8 Set up normal trigger 2–9

Making Measurements 2–10

Use time cursors 2–10 Use voltage cursors 2–12 Make automatic voltage measurements 2–13 Make automatic time measurements 2–14

Using Trigger Holdoff 2–15

Trigger on a repeating serial pattern 2–15 Trigger in the presence of repeating glitches 2–17

Using Storage Operations 2–19

Store a trace 2–19 Store a trace using a measurement storage module 2–20 Store a front-panel setup 2–21

Contents–2

Using Advanced Oscilloscope Operations 2–22

See narrow pulses at low sweep speeds 2–23 Use HF reject to trigger on signals with narrow glitches 2–24 View a low-frequency waveform 2–25 Set up the oscilloscope for single-shot events 2–27 View single-shot signals 2–28 Use averaging to clean up the display of noisy signals 2–30 Observe the phase differences between signals 2–33 Use X versus Y mode to display phase differences 2–35 View a modulated RF envelope 2–36 Conclusion 2–37

3 Using HP MegaZoom Technology

Contents

Who should do these exercises? 3–3

Probing a signal and adjusting the time base (sweep speed) 3–4

Probe the signal and autoscale 3–4 View the waveform 3–4

Setting a glitch trigger mode and panning and zooming the

display 3–6

Probe the test point and autoscale 3–6 Set the glitch trigger 3–6 Pan and zoom the display 3–7

Capturing a single shot glitch and panning and zooming the

display 3–8

Capture the single shot glitch 3–8 Pan and zoom the display 3–8 Conclusion 3–10

Contents–3

Contents

4 Mixed Signal Oscilloscope Exercises

Who should do these exercises? 4–3

Using Basic Logic Analysis Features of the Mixed Signal

Oscilloscope 4–4

Probe the signals and apply power 4–4 Select and position a waveform 4–4 Turn channels off and on 4–5 Label the channels 4–6

Using Simple Triggering Techniques 4–8

Probe the signals and apply power 4–9 Define an edge trigger 4–9 Define a pattern trigger 4–10 Set up a measurement 4–11 Make a measurement using cursors 4–11

Using Advanced Triggering Techniques 4–13

Probe the signals 4–14 Examine the pulse train 4–15 Define an advanced trigger 4–16 Observe the narrow pulse 4–17 Trigger on the narrow pulse 4–18 View the advanced triggering overview menu 4–19

Using Oscilloscope Features and the Logic Analysis Features

Together 4–20

Probe the signals 4–21 Define the logic analyzer trigger 4–21 Change the trigger and view the new waveform 4–22 Conclusion 4–23

Contents–4

5 Digital Circuitry Measurement Exercises

Who should do these exercises? 5–3

Using Basic Logic Analyzer Controls 5–4

Select and position a waveform 5–4 Turn channels off and on 5–4 Label the channels 5–6

Using Simple Triggering Techniques 5–8

Probe the signals and apply power 5–9 Define an edge trigger 5–9 Define a pattern trigger 5–10 Set up a measurement 5–11 Make a measurement using cursors 5–11 Make an automated measurement 5–13

Contents

Using Advanced Triggering Techniques 5–15

Probe the signals 5–16 Examine the pulse train 5–17 Measure the clock period 5–18 Define an advanced trigger 5–19 Observe the narrow pulse 5–20 Trigger on the narrow pulse 5–21 View the advanced triggering overview menu 5–22

Contents–5

Contents

Using an External Oscilloscope and the Logic Analyzer Together 5–23

Examine the schematic 5–24 Probe the signals 5–25 Connect the instruments and apply power 5–25 Define the logic analyzer trigger 5–26 Trigger the oscilloscope and view the waveform 5–27 Change the trigger and view the new waveform 5–28 Configure an oscilloscope manually to receive a trigger 5–29 Conclusion 5–30

Index

Contents–6

Getting Started

These exercises are designed to get you started with your oscilloscope or logic analyzer.

The self-contained sections describe getting started with the following instruments, respectively:

• HP 54600, HP 54601B, HP 54602B, HP 54603B, HP 54610B,

HP 54615B, HP 54616B/C basic oscilloscopes

• HP 54645A oscilloscope with HP MegaZoom technology

• HP 54645D mixed signal oscilloscope

• HP 54620A/C logic analyzer

Turn to the section in this chapter that describes your instrument. At the end of the appropriate section you will be directed to the next set of exercises that apply to your oscilloscope or logic analyzer.

1–2

Getting started with the HP 54600 Basic Oscilloscopes or the HP 54645A Oscilloscope

In this section you will learn how to turn on both the training board and the oscilloscope. You will also learn how to set the oscilloscope for proper probe attenuation factor and how to compensate the probes.

This section applies to the following oscilloscopes: the HP 54600B, HP 54601B, HP 54602B, HP 54603B, HP 54610B, HP 54615B, HP 54616B/C basic oscilloscopes, and the HP 54645A oscilloscope with HP MegaZoom technology.

Install the battery

Remove the insulating material from the battery holder.

This material is used to separate the terminals on the battery from those on the battery holder.

To prevent unnecessary strain on the board, place two fingers on the battery-holder terminals. Then, push on the bottom of the battery with your thumb to snap the battery into its sockets.

Take care to install the battery with correct polarity. Board circuits are protected from accidental exposure to reverse polarity through the use of a shunting diode. Momentary contact with reverse polarity will not damage the circuits.

It is not always necessary to turn off power to the trainin g board before mak i ng or changing measurements i n the exercise s t hat follow, unless you are instructed to do so.

1–3

Getting started with the HP 54600 Basic Oscilloscopes or the HP 54645A Oscilloscope

Turn on the board

•

Press the pushbutton near the battery holder next to the red LED. Push once to turn on. Push again to turn off.

When power is applied, the LED is lit.

Turn on the oscilloscope

Plug the power cord into the socket on the rear panel.

WARNING

Only use power sources with an approved three-contact outlet. Sockets with polarized two-conductor plugs will not ground the chassis, and they are a shock hazard.

Plug the other end of the cord into a line outlet, 100 V ac to 240 V ac, 48 Hz to 445 Hz. (The line voltage selection is automatic.)

Push in the line switch button (below the lower-right side of the display).

Set up the oscilloscope in a default state

Press the grey

Press the

By doing this, your oscilloscope displays will resemble the screens shown in this section.

Setup

Default Setup

softkey at the lower right side of the display.

1–4

Figure 1–1

Getting started with the HP 54600 Basic Oscilloscopes or the HP 54645A Oscilloscope

Display a wavefor m

Display a waveform

Connect one of the probes supplied with the instrument to the channel 1 BNC connector at the bottom of the front panel.

Connect the probe to the oscilloscope probe compensation test point on the lower-left side of the front panel.

Press the

You should now see a stable calibrator waveform. The Autoscale feature automatically sets the vertical, time base, and trigger for a stable display of most signals with a frequency greater than 50 Hz and a duty cycle greater than 1%. This key eliminates the tedious setup of several controls that is necessary on most analog oscilloscopes.

Autosc al e

key located just to the right of the display.

Autoscale d wave fo rm

About Probes:

The HP 54600B, HP 54601B, HP 54602B, and HP 54603B oscilloscopes are supplied with HP 10071A 10:1 probes. The HP 54610B, HP 54615B, and HP 54616B/C oscilloscopes are supplied with HP 10073A 10:1 probes. The HP 54645A oscilloscope with HP MegaZoom technology and the HP 54645D mixed signal oscilloscope are supplied with HP 10074A 10:1 probes.

1–5

Getting started with the HP 54600 Basic Oscilloscopes or the HP 54645A Oscilloscope

Set the probe attenuation fac tor

Set the probe attenuation factor

Figure 1– 2

Press the grey

Toggle the

key.

Probe

softkey, at the lower-right side of the display, to 10. (Note that the HP 54610B, HP 54615B, HP 54616B/C, and the HP 54645A oscilloscopes have automatic probe attenuation factor selection).

Important operating hint!

You must set the probe attenu ation factor correctly or measu rem ent voltage data will be wrong. Notic e that toggling the probe attenuation factor does not change the waveform displ ay . It does change the scale factor for channel 1. The status line shows V/di v based on the att enuation factor that you have selected.

Autoscale d wave fo rm

On the body of the probe there i s an orange button. W hen you press this button, the input signal i s momentaril y interrupted and the probe is c onnected to ground. This makes it easy to identify the channel to whi ch the probe is connected.

1–6

Figure 1–3

Overcompensation causes pulse peaking.

Getting started with the HP 54600 Basic Oscilloscopes or the HP 54645A Oscilloscope

Compensat e your probes

Compensate your probes

Insert the nonmetallic screwdriver (provided with the probe) into the adjustment hole on the BNC end of the probe. Then, adjust the compensation for the flattest waveform possible on the display.

Remove the first probe from the oscilloscope, then adjust a second 10:1 probe as in step one.

Compensating the probe for the flattest pulse response ensures a distortion-free display of test waveforms. Compensation adjusts the frequency response of the probe so that distortion, as a function of frequency or rise time, does not occur.

Figure 1– 4

Correct compensation with a flat pulse top.

Figure 1–5

Undercompensation causes pulse rolloff.

1–7

Figure 1–6

Getting started with the HP 54600 Basic Oscilloscopes or the HP 54645A Oscilloscope

View a signa l on the training signal board

View a signal on the training signal board

Remove the probe from the calibrator test point on the oscilloscope.

Connect the probe ground to a ground test point on the training signal board, then connect the probe to the number 1 test point.

Turn on the board by pressing the pushbutton near the battery.

Press

You now have a display of the test point 1 waveform.

Autosc al e

Test point 1 waveform displayed

1–8

Getting started with the HP 54600 Basic Oscilloscopes or the HP 54645A Oscilloscope

The Next Step: S electing exercis es for HP 54600 Basic Oscilloscopes or the HP 54645A Oscilloscopes

The Next Step: Selecting exercises for HP 54600 Basic Oscilloscopes or the HP 54645A Oscilloscopes

If you are using the HP 54600B, HP 54601B, HP 54602B, HP 54603B, HP 54610B, HP 54615B, HP 54616B/C oscilloscopes, proceed to the basic oscilloscope exercises in Chapter 2. After completing the exercises in Chapter 2, your training will be complete.

If you are using the HP 54645A oscilloscope with HP MegaZoom technology, proceed first to the basic oscilloscope exercises in Chapter 2. After completing the exercises in Chapter 2, you will be directed to further exercises for your instrument which use the MegaZoom technology.

1–9