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 National Instruments Corporation

7-1

Getting Started with VirtualBench

In Windows 3.1x, you launch VirtualBench-Arb (Arbitrary Waveform 
Generator) by double-clicking on the Arb icon in the VirtualBench 
program group. In Windows 95/NT 4.0, you launch VirtualBench-Arb 
by selecting Start»Programs»VirtualBench»VirtualBench-Arb.

The key features of the Waveform Generator front panel of 
VirtualBench-Arb are:

•

Waveform Name/Load Waveform Control— shows the name of 
the waveform, if any, that currently loads into the channel buffer. 
Select this window to load from a file to a waveform.

•

Play Mode —plays the waveform continuously. When deselected, 
plays the waveform only once.

•

Update Rate — controls the update rate of the waveform. This 
control does not affect the play speed of waveform files (

.wfm

) but 

does affect waveform quality. With text and sound (

.wav

) files, the 

update rate determines the play speed by controlling the number of 
samples of the waveform that are played per second.

•

Frequency Control — modifies the rate at which waveform files 
(

.wfm

) are played. The waveform rate is multiplied by this value to 

determine the actual play speed. Text and sound (

.wav

) files are 

unaffected by this control.

Waveform
Name/Load
Waveform

Frequency
Control

Update
Rate

Amplitude Offset Phase

Play Mode

Play/Stop

06Chap07.fm  Page 1  Friday, February 28, 1997  3:22 PM