LeCroy PXA125, User Manual

Page: 100 / 219

User Manual PXA125
3-86 ArbConnection
Finally, when you are done creating and editing your waveform, you
can save your work to a directory of your choice. The name at the title
will show you the name you selected for storing your waveform and its
path.
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 3-20, you’ll see that
the vertical axis is marked with sample clock frequencies. You’ll see
later that as you draw waveforms on the FM composer screen, these
waveforms will 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 PXA125 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
PXA125 using the FM Composer.
You can invoke the FM Composer from two places: On the Panels bar
click on FM, or from the Modulation Panel click on “To FM
Composer”. Figure 3-20 shows the waveform composer, immediately
after you first invoke this utility.
The Wave Composer has three sections: Commands bar, Toolbar
and Waveform screen. Refer to Figure 3-20 throughout the
description of these parts.
The Commands bar
The commands bar 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.