National Instruments 373873C-01

Chapter 3 Working with Projects

results immediately. If you modify the configuration of steps while a

project runs, LabVIEW SignalExpress gives you direct, immediate

feedback on the changes you make. When you click the Run Once button,

LabVIEW SignalExpress executes all steps in the project one time.

Complete the following steps to run the sample project and display signals.

1. Click the Run button, shown at left, to execute all steps in the project

continuously.

The project loads a signal from a text file and performs two operations

on the signal—an amplitude and levels measurement and a distortion

measurement. The Amplitude and Levels step and the Distortion step

perform these measurements, respectively. When you run a project,

steps analyze input signals and generate new output signals as a result

of the analysis. In this project, the Load from ASCII step loads a

distorted sine wave, the Amplitude and Levels step and the Distortion

step analyze the sine wave, and both steps return new outputs. In the

Project View, LabVIEW SignalExpress indicates inputs with red

arrows and outputs with blue arrows.

The graph in the Data View still contains the loaded signal, which is a

time-domain signal. Graphs display time-domain, frequency-domain,

or x-y signals.

2. Click the exported spectrum output signal of the Distor tion step in the

Project View and drag it to the Data View to display the signal.

LabVIEW SignalExpress creates a new graph in the Data View.

LabVIEW SignalExpress does not display the exported spectrum

signal on the same graph as the time-domain signal because the

exported spectrum signal is a frequency-domain signal. LabVIEW

SignalExpress automatically recognizes different types of signals and

renders them in the appropriate displays.

3. Select Help»LabVIEW SignalExpress Help , click the Search tab,

and enter "signal types" to refer to the LabVIEW SignalExpress

Help for more information about signal types. The help provides

information about using LabVIEW SignalExpress functionality such

as projects, steps, and signals.

4. Click the dc output of the Ampli tude and Levels step and drag it to the

Data View to display the measurement.

LabVIEW SignalExpress creates a table to display the scalar

measurement from the dc output.