Racal Instruments 3155 Spezifikationen PDF herunterladen (Seite 94)

User Manual 3155

ArbConnection 3-41

1) Click and hold the mouse cursor on the left anchor triangle and

then drag the curtain to the left position. Do the same for the

right anchor. Notice the X and Y coordinates at the top of the

waveform screen and how they change to correspond to your

anchor placement.

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 3-14.

Finally, when finished creating and editing your waveform, you can

save your work to the directory of your choice. The name on the

waveform graph title bar will display the name and path selected.

The FM Composer

The FM Composer looks and feels almost like the waveform com-

poser except there is a major difference in what it does. If you look at

the opening screen as shown in Figure 3-18, you’ll see that the verti-

cal axis is marked with sample clock frequencies. You’ll see later that

as you draw waveforms on the FM Composer graph, these wave-

forms represent frequency changes and not amplitude changes like

those generated by the waveform composer.

The FM Composer is a great tool for controlling frequency agility by

using arbitrary waveform. For example, if you create a sine wave-

form, the 3155 will generate a frequency-modulated signal that fol-

lows the sine pattern. The resolution and accuracy of the modulated

waveform is unsurpassed and can only be duplicated by mathe-

matical simulation. The FM Composer has many features and op-

tions so use the following paragraphs to learn how to create and

download modulation waveforms to the 3155.

You can invoke the FM Composer from two places: On the Panels

toolbar click on FM, or from the Modulation Panel click on “To FM

Composer”. Figure 3-17 shows the waveform composer immediately

after you first invoke this utility.

The Wave Composer has three sections: the Wave Composer menu

bar, the Toolbar, and the Waveform graph. Refer to Figure 3-18

throughout the description of these parts.

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Racal Instruments 3155 Spezifikationen Seite 94