Racal Instruments 3156B, Руководство пользователя

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3156B User Manual
WaveCAD 4-46 Racal Instrument © 2005
2) You can also place your anchors in a more precise manner from
the waveform library by programming the start and end points for
the waveform. An example of anchor placement using the sine
dialog box is shown in Figure 4-21.
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 4-24, 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 3156B 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 3156B
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 4-24 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.