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User Manual 3155
The Modulation
Panel
Frequency Modulation
or return to the main panel and leave the Trigger Panel in the back-
ground by clicking on the "To Main Panel" key.
The Modulation panel, as shown in Figure 3-8, is invoked either by
pressing the MOD button (on the Panels toolbar) or the "To Modula-
tion Panel" button on the Main Panel. The modulation panel provides
access and control of a number of functions: FM (frequency modula-
tion), FSK (frequency shift keying) and Sweep. The 3155 performs
only one of these functions at a time and WaveCAD displays an error
if you try to enable more than one modulation option.
The functional groups in the Modulation Panel are divided into three
parts: Frequency Modulation, FSK and Sweep. These groups are
described below.
The Frequency Modulation group contains parameters for controlling
the sample clock. To turn the FM function on and off, click on the
State button in this group. There are sub-groups in the FM block: Pa-
rameters, Shape, Mode and Slope.
Parameters – Allow adjustment of waveform parameters that are
selected from the Shape sub-group (below). Notice that the parame-
ters change when you select different shapes. To access the re-
quired parameter, click on the button below the parameters sub-
group until the LED next to the required parameter turns on. The
value of the parameter next to the lit LED is displayed on the digital
display. You can use the dial, keyboard, or the [↑] [↓} keys to adjust
the readout to the required setting. After you modify the setting, press
Execute to update the 3155.
Shape – Determines the frequency modulation profile. There are four
standard patterns that are built into the instrument: sine, triangle,
square and ramp, which are selected from built-in lookup tables. The
arbitrary waveform shape must be downloaded to the instrument
from an external application, or from the FM Composer. Information
on the standard and arbitrary FM functions is given in Chapter 3 of
this manual. Click on the button next to the desired modulation
waveform shape to select it.
ArbConnection 3-21
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