 ### 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.

• Voltmeter Instrument

#### Measuring DC Voltages

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

• Basic Periodic Signals

#### Project 1: Waveform Gene...

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.

• Sinusoids and Swept Signals

#### Project 2: Waveform Gene...

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

• Modulated Signals

#### Project 3: Waveform Gene...

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.

• Audio and .wav Files

#### Project 4: Waveform Gene...

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.

• Importing Files and Playing “Scales”

#### Project 5: Waveform Gene...

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

• Creating Signals from Math and “Beating”

#### Project 6: Waveform Gene...

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

• 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.

• 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 easie...

• Measurements and Cursors

#### Project 3: Oscilloscope

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

• 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...

• XY Plots

#### Project 5: Oscilloscope

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

• Exporting data

#### Project 6: Oscilloscope

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

• Single Sequence Acquisition

#### Project 7: Oscilloscope

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

Voltage Instrument

#### DC Power Supplies

Applying voltage using the Analog Discovery's Voltage instrument to a diode to produce light. 19.3K
×
Voltmeter Instrument

#### Measuring DC Voltages

Utilize the Analog Discovery's Voltmeter instrument to measure voltage in a circuit. 12.4K
×
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. 11.5K
×
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. 10.7K
×
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. 7.48K
×
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. 9.44K
×
Importing Files and Playing “Scales”

#### Project 5: Waveform Generator

Use the Analog Discovery's ability to import "custom" waveforms from a file. 7.26K
×
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. 6.11K
×
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. 16.1K
×
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. 8.82K
×
Measurements and Cursors

#### Project 3: Oscilloscope

How to use some of the most basic and common oscilloscope tools to simplify the measurement process. 10.4K
×
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. 9.64K
×
XY Plots

#### Project 5: Oscilloscope

Use the Analog Discovery to plot the voltage-current characteristics of a light emitting diode. 11.7K
×
Exporting data

#### Project 6: Oscilloscope

Export the voltage-current data of a light emitting diode. 7.91K
×
Single Sequence Acquisition

#### Project 7: Oscilloscope

Acquiring vibration data from the piezoelectric sensor from the analog parts kit. 6.29K
×

# Math Channels

## Introduction

Oscilloscope will only measure voltages as a function of time. However, we are often interested in something other than simply voltages in a circuit; we would often like to have a representation of current. Most oscilloscopes provide one or more math channels which provide the ability to calculate and plot simple mathematical functions of the measured voltages. Adding or subtracting voltages measured on two channels, for example, are common math functions which are available on most oscilloscopes.

In this project, we will introduce the use of the math channel function on the Analog Discovery™. The Analog Discovery's math channels provide the ability to perform a wide variety of mathematical operations, all of which can be applied to the voltages being measured. We will use a math channel and Ohm's law to determine the current in a resistor.

##### After you're done, you should:
• Use the Analog Discovery oscilloscope math channel.

## Procedures

### Shortcut!

• To continue where the Measurements and Cursors project left off, simply close the Measurements window and remove the cursors from the screen by dragging them back to their starting positions at the lower-left and upper-right of the scope's main time window.

### Step 1: Set up a Math Channel

#### A. Determine Desired Mathematical Relation

1. We want to find the current I through the 100Ω resistor in the schematic shown to the right.

2. The channel 2 terminals (2+, 2-) are used to measure the voltage difference across the resistor terminals.

3. By Ohm's law, the current through the resistor is the resistor voltage difference divided by the resistance:

4. $I = \frac{{{\rm{C}}2}}{{100}}$

#### B. Create a Math Channel to Implement the Equation from Step A

1. A Custom Math Function window will open. This window provides buttons with a number of math functions, and a text box where a mathematical function can be typed.

#### C. Create the Math Function

1. The Custom Math Function window will close, and a red line will appear on the main oscilloscope window.

#### D. Set the Units and Scaling on the Math Channel

1. The default scaling on the math channel will very likely be poor and the displayed units will be incorrect. First, change the units of the math channel, as shown below:

1. Now, change the scaling on the math channel: The images above are screenshots of Digilent WaveForms running on Microsoft Windows 7.