Tabor Electronics 5251, Руководство пользователя

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3
ArbConnection
Generating Waveforms Using the Equation Editor
3-71
The FM Composer
The FM Composer looks and feels almost like the waveform
composer except there is a major difference in what it does. If you
look at the opening screen as shown in Figure 4-53, you’ll see that
the vertical axis is marked with frequencies. You’ll see later that as
you draw waveforms on the FM composer screen, these waveforms
represent frequency changes and not amplitude changes as are
generated by the waveform composer.
The FM composer is a great tool for controlling frequency agility by
generating the agility curve as an arbitrary waveform. For example,
if you create a sine waveform, the 5251 will generate frequency-
modulated signal that will follow the sine pattern. The resolution and
accuracy of the modulated waveform is unsurpassed and can only
be duplicated by mathematical simulation. The FM composer is
loaded with many features and options so use the following
paragraphs to learn how to create and download modulating
waveforms to the 5251 using the FM Composer.
Invoke the FM Composer from Panels bar. The Wave Composer
has three sections: Commands bar, Toolbar and Waveform screen.
Refer to Figure 3-53 throughout the description of these parts.
The Commands bar The commands bar is exact duplication of the commands bar in the
Wave composer. It provides access to standard Windows
commands such as File and View.
In general, clicking on one of the commands opens a dialog box
with an additional list of commands. Then, clicking on an additional
command, may open a dialog box, or generate an immediate
action. For example, Clicking on File and then Exit will cause an
immediate termination of the FM Composer. On the other hand,
clicking on Wave and then on Square, will open a Square Wave
dialog box that lets you program and edit square wave parameters.
The various commands in the Commands bar are listed and
described below.