A&D Series 57ZZ Manuel d'utilisateur

Delay LineTriggerAmpDisplayVertAmpHorizAmpCopyright © 2000 Tektronix, Inc. All rights reserved.XYZs of OscilloscopesPrimerAnalog OscilloscopeAcquisiti

on the screen. The trigger is necessary to stabilize arepeating signal. It ensures that the sweep begins atthe same point of a repeating signal, resul

“cell” of information for every single pixel in thescope’s display. Each time a waveform is captured(in other words, every time the scope triggers), i

structing straight-edged signals such as squarewaves. The more versatile sin x/x interpolation connectssample points with curves (see Figure 11). Sin

Learning a new skill often involves learning a newvocabulary. This idea holds true for learning how touse an oscilloscope. This section describes some

steady current and voltage, such as a batteryproduces.) The damped sine wave is a special case you may seein a circuit that oscillates but winds down

Waveform Measurements You use many terms to describe the types ofmeasurements that you take with your oscilloscope.This section describes some of the

Frequency Response Bandwidth alone is not enough to ensure that anoscilloscope can accurately capture a high frequencysignal. The goal of oscilloscope

This section briefly describes how to set up and startusing an oscilloscope – specifically, how to groundthe oscilloscope, set the controls in standar

can display a waveform on the screen. Multiplechannels are handy for comparing waveforms. Some oscilloscopes have an AUTOSET or PRESETbutton that sets

described elsewhere in this document. Figure 25shows a simple diagram of the internal workings of aprobe, its adjustment, and the input of an oscillo-

Compensating the Probe Before using a passive probe, you need to compen-sate it – to balance its electrical properties to aparticular oscilloscope. Yo

This section briefly describes the basic controlsfound on analog and digitizing oscilloscopes.Remember that some controls differ between analogand dig

zero volts. Figure 29 illustrates this difference. TheAC coupling setting is handy when the entire signal(alternating plus constant components) is too

Math Operations Your oscilloscope may also have operations to allowyou to add waveforms together, creating a new wave-form display. Analog oscilloscop

(called pretrigger viewing). Thus it determines thelength of the viewable signal both preceding andfollowing a trigger point. Digitizing oscilloscopes

The trigger makes repeating waveforms appear staticon the oscilloscope display by repeatedly displayingthe same portion of the input signal. Imagine t

In practice, you will probably use both modes:normal mode because it lets you select just the signalarea you need to see, and auto mode because itrequ

Acquisition Controls for DigitizingOscilloscopes Digitizing oscilloscopes have settings that let youcontrol how the acquisition system processes asign

Stopping and Starting the Acquisition System One of the greatest advantages of digitizing oscillo-scopes is their ability to store waveforms for later

This section teaches you basic measurement tech-niques. The two most basic measurements you canmake are voltage and time measurements. Just aboutevery

iXYZs of OscilloscopesThe oscilloscope is an essential tool if you plan to design or repair electronicequipment. It lets you “see” electrical signals.

vertically, then taking the measurement along thecenter vertical graticule line having the smaller divi-sions makes for the best voltage measurements

Phase Shift MeasurementsThe horizontal control section may have an XYmode that lets you display an input signal ratherthan the time base on the horizo

Waveform Measurements withDigitizing Oscilloscopes Digitizing oscilloscopes have functions that makewaveform measurements easier. Modern DSOs andDPOs

This section contains written exercises that cover information in this book. Theexercises are divided into two parts, Part I and Part II. Part I cover

Part I ExercisesThe following exercises cover information presented in these sections:• The Oscilloscope• Oscilloscope TerminologyCheck how well you h

Using Oscilloscopes Exercise Circle the best answer for each statement. Some statements have more than one right answer. 1. With an oscilloscope you c

Part II ExercisesThe following exercises cover information presented in these sections:• Setting Up• The Controls• Measurement Techniques Check how we

Using Oscilloscopes Exercise Circle the best answer for each statement. Some statements have more than one right answer. 1. To operate an oscilloscope

10. A digital oscilloscope’s acquisition controls let you specify:a. Whether the oscilloscope uses real-time or equivalent-time sampling to collect sa

Answers to Exercises on Back33

ii

Answers to Written ExercisesThis section provides the answers to all written exercises in the previous sections. Part I: Vocabulary Exercise Answers 1

AC (Alternating Current) A signal in which the currentand voltage vary in a repeating pattern over time. ADC (Analog-to-Digital Converter) A digital e

Megahertz (MHz) 1,000,000 Hertz; a unit of frequency. Megasamples per second (MS/s) A sample rate unit equal to one million samplesper second. Microse

Waveform A graphic representation of a voltage varying overtime. Waveform Point A digital value that represents the voltage of asignal at a specific p

For further information, contact Tektronix:Worldwide Web: for the most up-to-date product information visit our web site at: www.tektronix.com/scopes/

Contents Introduction· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · iWhy Re

ivThe Controls · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 15Display Control

What is an oscilloscope, what can you do with it,and how does it work? This section answers thesefundamental questions. The oscilloscope is basically

What Can You Do With anOscilloscope? Oscilloscopes are used by everyone from televisionrepair technicians to physicists. They are indispens-able for a

samples. It stores these samples until it accumulatesenough samples to describe a waveform, and then re-assembles the waveform for viewing on the scre