Beginner Analog Discovery, Module 1

Voltage Instrument

DC Power Supplies

Applying voltage using the Analog Discovery's Voltage instrument to a diode to produce light.

14.4K
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Voltmeter Instrument

Measuring DC Voltages

Utilize the Analog Discovery's Voltmeter instrument to measure voltage in a circuit.

9.79K
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Basic Periodic Signals

Project 1: Waveform Generator

Using the Analog Discovery's arbitrary waveform generator to apply a time-varying signal to an LED to make it flash on and off. This project builds off of the previous Analog Discovery material.

8.49K
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Sinusoids and Swept Signals

Project 2: Waveform Generator

Use the arbitrary waveform generator on the Analog Discovery to apply sinusoidal and swept sinusoidal voltages to a speaker.

6.88K
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Modulated Signals

Project 3: Waveform Generator

Use the arbitrary waveform generator on the Analog Discovery to create frequency modulated signals and apply them to a speaker. This project builds off of the previous Analog Discovery material.

5.39K
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Audio and .wav Files

Project 4: Waveform Generator

Use the Analog Discovery to play back .wav files through the speaker included in the analog parts kit. This project builds off of material presented in previous Analog Discovery projects.

6.48K
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Importing Files and Playing “Scales”

Project 5: Waveform Generator

Use the Analog Discovery's ability to import "custom" waveforms from a file.

5.08K
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Creating Signals from Math and “Beating”

Project 6: Waveform Generator

Use the Analog Discovery's ability to create "custom" waveforms according to a mathematical function.

4.51K
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Basic Waveform Measurement and Display

Project 1: Oscilloscope

Introduces the Analog Discovery's Oscilloscope instrument. Explains the basics of the ways in which voltages are acquired and displayed by the oscilloscope.

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Triggered Acquisition

Project 2: Oscilloscope

The Arbitrary waveform generator instrument will be used to apply relatively rapidly varying wave forms to the oscilloscope, and then triggering of the waveform will be used to make the waveform easier to view and analyze.

6.51K
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Measurements and Cursors

Project 3: Oscilloscope

How to use some of the most basic and common oscilloscope tools to simplify the measurement process.

7.81K
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Math Channels

Project 4: Oscilloscope

Introduces the use of the math channel function on the Analog Discovery. This function allows the user to perform a wide variety of mathematical operations, all of which can be applied to the voltages being measured.

6.34K
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XY Plots

Project 5: Oscilloscope

Use the Analog Discovery to plot the voltage-current characteristics of a light emitting diode.

7.73K
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Exporting data

Project 6: Oscilloscope

Export the voltage-current data of a light emitting diode.

5.18K
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Single Sequence Acquisition

Project 7: Oscilloscope

Acquiring vibration data from the piezoelectric sensor from the analog parts kit.

4.56K
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XY Plots

Project 5: Oscilloscope

XY Plots

Project 5: Oscilloscope

Introduction

So far, we have only plotted our waveforms as functions of time—the horizontal axis of our plots has always been time. However, it is also possible to plot one scope channel as a function of another scope channel. These types of plots are called XY plots, and are very common. For example, Lissajous figures (plots of one voltage as a function of another) are useful in determining time delays between voltage signals, and voltage-current characteristics (plots of the current through a component as a function of the voltage across a component) are useful in developing mathematical descriptions of the component.

In this project, we will use the Analog Discovery™ to plot the voltage-current characteristics of a light emitting diode.

Before you begin, you should:
After you're done, you should:
  • Use the Analog Discovery oscilloscope to create XY plots.

Procedures

Shortcut!

If you have completed the previous Math Channels project, your oscilloscope display should look similar to the display shown at the end of Part D before continuing this exercise.

Step 1: Set up an XY Plot

A. Determine Desired Waveforms for the XY Plot

  1. We want to put the current through the diode on the vertical axis of our plot, and the voltage across the diode on the horizontal axis of our plot.

  2. The current through the diode is the same as the current through the resistor, I, per the schematic to the right.

  3. The voltage across the diode, V in the schematic, is available as channel 1 of the scope.

B. Assign the X and Y Axes

  1. Per step A, we want to plot channel 1 of the scope (C1) on our X axis, and the math channel (M1) of the First Touch Oscilloscope Math Channels Project on our Y axis. Do this as follows:

C. Scale the XY Plot

  1. The XY plot scale is set by the scale in the main time window. To change the scale on the XY plot, you need to change scales on the individual channels involved. An example is shown below.

The above screenshots are of Digilent WaveForms running on Microsoft Windows 7.

Test Your Knowledge!

  1. Try plotting a voltage-current characteristic for the resistor. Put the resistor voltage difference (channel 1) on the vertical axis, and the resistor current (the Math 1 channel) on the horizontal axis. Your XY plot should be a straight line.
    • To change the selections of the X and Y data, click on the icon in the XY plot window. Choose the data as in step C above.
    • Ohm's law states that, for a resistor, V=IR. Therefore, your XY plot should be a straight line; the slope of the line should be the resistance of the resistor, 100Ω. Check the slope of the XY plot against this expectation.

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