© National Instruments Corporation 4-1 Getting Started with LabVIEW SignalExpress
4
Working with Signals
You can use LabVIEW SignalExpress to generate and analyze signals to
evaluate designs without programming. This chapter teaches you how to
work with signals in LabVIEW SignalExpress, including how to plot
signals on graphs, import signals from a file, interactively align and
compare two signals, and save signals to a file.

Graphing Signals

Complete the following steps to plot signals in a sample project and
examine the signals visually using cursors.
1. Select File»Open Project, navigate to the SignalExpress\
Examples\Tutorial directory, and double-click
Signals.seproj. This project configures the Create Signal step
to create a square wave signal and the Filter step to perform a lowpass
Butterworth filter.
2. Drag the step signal output of the Create Signal step to the Data View.
3. Drag the filtered step output of the Filter step to the Dat a View.
You can plot signals of the same signal type on the same graph. Both
the step signal and the filtered step signals are time-domain signals,
so they appear on the same graph. If you want to plot signals of
different types, drag the signals to the same graph and LabVIEW
SignalExpress creates a new graph.
4. Click the Add Display button, shown at left, on the toolbar to create a
new graph.
5. Drag the filtered step output of the Filter step to the new graph.