Digital Oscilloscope Principles and Experiments

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Questions and Answers

What can an oscilloscope measure?

  • Current, resistance, and capacitance
  • Temperature, pressure, and humidity
  • Length, width, and height
  • Voltage, frequency, and phase (correct)

What type of oscilloscopes use a cathode-ray tube with its associated control and input circuitries?

  • Hybrid oscilloscopes
  • Analog oscilloscopes (correct)
  • Miniature oscilloscopes
  • Digital oscilloscopes

What does X-Y mode of an oscilloscope allow you to do?

  • Generate a graph of an input signal versus time
  • Plot one input signal versus another (correct)
  • View events that may happen only once
  • Measure peak voltage, frequency, and phase difference

What type of oscilloscopes are fully digital?

<p>Modern oscilloscopes (D)</p> Signup and view all the answers

What is the principle of operation of an analog oscilloscope?

<p>Uses a cathode-ray tube with associated control and input circuitries (D)</p> Signup and view all the answers

What kind of measurements can be made using an analog oscilloscope?

<p>Peak voltage, frequency, period, phase difference, pulse width, delay time, rise time, and fall time (A)</p> Signup and view all the answers

What is the function of the trigger circuitry in a digital oscilloscope?

<p>To steady the signal displayed on the screen (C)</p> Signup and view all the answers

What is the role of the vertical system in a digital oscilloscope?

<p>To adjust the amplitude of the signal (A)</p> Signup and view all the answers

What is the key function of the horizontal system in a digital oscilloscope?

<p>To generate the sample clock (A)</p> Signup and view all the answers

What does an analog-to-digital converter (ADC) do in a digital oscilloscope?

<p>Converts the incoming analog signal into a digital format (C)</p> Signup and view all the answers

In real-time sampling, what does a digital oscilloscope do?

<p>Collects consecutively as many samples as it can as the signal occurs (D)</p> Signup and view all the answers

What is the main purpose of waveform sampling in digital oscilloscopes?

<p>To acquire the digital samples (B)</p> Signup and view all the answers

What happens if a signal is so fast that a digital oscilloscope can collect only a few sample points?

<p>It uses interpolation to display the waveform (A)</p> Signup and view all the answers

How are digital waveform points stored in a digital oscilloscope?

<p>As waveform records (B)</p> Signup and view all the answers

What determines how often an analog-to-digital converter (ADC) takes a sample in a digital oscilloscope?

<p>'Clock ticks' per second (A)</p> Signup and view all the answers

What is the purpose of storing waveform points in memory in a digital oscilloscope?

<p>To use for interpolation in displaying waveforms (D)</p> Signup and view all the answers

What are the key measurements that can be made using a digital oscilloscope?

<p>Voltage, frequency, and phase</p> Signup and view all the answers

What type of waveforms can an oscilloscope graph against a second variable in X-Y mode?

<p>All types of waveforms</p> Signup and view all the answers

What are the basic quantities that can be measured using an oscilloscope?

<p>Peak voltage, frequency or period, phase difference, pulse width, delay time, rise time, and fall time</p> Signup and view all the answers

What are the components inside a conventional CRT tube used in analog oscilloscopes?

<p>Electron gun, deflection plates, and the phosphorescent screen</p> Signup and view all the answers

What is the main difference between early analog oscilloscopes and modern digital oscilloscopes?

<p>Early oscilloscopes are of analog type, while modern oscilloscopes are fully digital</p> Signup and view all the answers

What is the function of an oscilloscope in V-T mode?

<p>Generating a graph of an input signal versus time</p> Signup and view all the answers

What is the basic concept behind digital oscilloscopes?

<p>The basic concept is the conversion of the incoming analog signal into a digital format for further processing using digital signal processing techniques.</p> Signup and view all the answers

What is the role of the vertical system in a digital oscilloscope?

<p>The vertical system preconditions the signal, adjusts its amplitude, and is responsible for the acquisition of digital samples.</p> Signup and view all the answers

What determines how often an analog-to-digital converter (ADC) takes a sample in a digital oscilloscope?

<p>The sample clock generated by the horizontal system determines how often the ADC takes a sample.</p> Signup and view all the answers

What is the function of the trigger circuitry in a digital oscilloscope?

<p>The trigger circuitry stabilizes the displayed signal on the screen and determines what parts of the signal to 'trigger' on and start measuring.</p> Signup and view all the answers

What type of sampling method is used as the standard in digital oscilloscopes?

<p>Real-time sampling is the standard sampling method used in digital oscilloscopes.</p> Signup and view all the answers

What is used to sample the signal at discrete points in time in a digital oscilloscope?

<p>Analog-to-digital converter (ADC) is used to sample the signal at discrete points in time and convert the signal's voltage into digital values.</p> Signup and view all the answers

What does the record length refer to in a digital oscilloscope?

<p>The record length refers to the number of waveform points used to make a waveform record.</p> Signup and view all the answers

What does the display do in a digital oscilloscope?

<p>The display receives the record waveform points stored in memory and sends them to the screen for visualization.</p> Signup and view all the answers

What type of signals require real-time sampling in a digital oscilloscope?

<p>Single-shot or transient signals require real-time sampling in a digital oscilloscope.</p> Signup and view all the answers

What is the main purpose of waveform sampling in digital oscilloscopes?

<p>The main purpose is to capture and convert the analog signal into digital format for further processing.</p> Signup and view all the answers

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Study Notes

Oscilloscope Measurements

  • An oscilloscope can measure voltage, current, frequency, and other parameters of a signal.

Types of Oscilloscopes

  • Conventional oscilloscopes use a cathode-ray tube (CRT) with associated control and input circuitries.
  • Fully digital oscilloscopes are digital.

X-Y Mode

  • X-Y mode allows an oscilloscope to graph a signal against a second variable.

Analog Oscilloscope

  • The principle of operation of an analog oscilloscope is to convert the input signal into a visible waveform.
  • Analog oscilloscopes can measure voltage, current, frequency, and other parameters of a signal.

Digital Oscilloscope

  • Digital oscilloscopes use analog-to-digital converters (ADCs) to digitize the input signal.
  • The trigger circuitry in a digital oscilloscope determines when to start sampling the signal.
  • The vertical system in a digital oscilloscope determines the amplitude of the signal.
  • The horizontal system in a digital oscilloscope determines the time axis of the signal.
  • ADCs sample the signal at discrete points in time.
  • In real-time sampling, a digital oscilloscope continuously samples the signal.
  • The main purpose of waveform sampling is to reconstruct the original signal.
  • If a signal is too fast, a digital oscilloscope may only collect a few sample points.
  • Digital waveform points are stored in memory.
  • The sampling rate determines how often an ADC takes a sample.
  • Storing waveform points in memory allows for analysis and display of the signal.
  • Digital oscilloscopes can measure voltage, current, frequency, and other parameters of a signal.

Special Modes

  • X-Y mode can graph any type of waveform against a second variable.
  • V-T mode is used to display the signal against time.

Oscilloscope Components

  • A conventional CRT tube in an analog oscilloscope has components such as an electron gun, deflection plates, and a phosphorescent screen.

Early Analog vs. Modern Digital Oscilloscopes

  • The main difference between early analog oscilloscopes and modern digital oscilloscopes is the method of signal measurement and display.

Digital Oscilloscope Basic Concept

  • The basic concept behind digital oscilloscopes is to digitize the input signal and reconstruct it for analysis and display.

Trigger Circuitry

  • The trigger circuitry determines when to start sampling the signal.

Sampling Method

  • The standard sampling method used in digital oscilloscopes is real-time sampling.

Record Length

  • The record length refers to the number of sample points stored in memory.

Display

  • The display shows the reconstructed waveform.

Real-Time Sampling

  • Real-time sampling is required for signals that are too fast to be sampled at a lower rate.

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