National Instruments 321518A-01 Manual De Usuario

Chapter 7

VirtualBench-Arb

©

 National Instruments Corporation

7-5

Getting Started with VirtualBench

c.

Click on New Component.  By default, every time you click on 
New Component, a new library component is added to any 
existing waveform.  

d.

Select the type of component: Library, Expression, or Sketch. 
The following steps further describe how to use these options.

3.

Creating a Waveform using the Library Functions.

a.

Enter the duration of the waveform in the Duration control. 
This control sets the duration of the first segment in the 
waveform.

b.

Click on New Component. This action adds a component to 
the first segment.

c.

Be sure that Library is selected in the Component Type 
control.

d.

Select a waveform from the library and modify the parameters 
if necessary.

e.

Click on New Component again to add a new component. This 
component adds to the first to produce the final segment. 
Change the Function selector to perform subtraction, 
multiplication, division, or frequency modulation.

f.

Click on New Segment to add additional waveform segments 
to the end of the waveform.

4.

Creating a Waveform from a Mathematical Expression.

a.

Create a new segment by clicking on New Segment.

b.

Create a new component in the segment by clicking on New 
Component.

c.

Select Expression from the Component Type control.

d.

Enter an expression in terms of variable x, in the expression 
box. Any error is indicated in red, with the character position 
of the error placed in parentheses.

e.

Enter the range for x in the From: and To: input boxes. The 
expression is evaluated over this range. 

f.

You can change the number of cycles of the waveform by 
changing the Cycles control.

5.

Creating a Waveform from a Freehand Sketch.

a.

Create a new segment by clicking on New Segment.

b.

Create a new component in the segment by clicking on New 
Component.

06Chap07.fm  Page 5  Friday, February 28, 1997  3:22 PM