DI-770 Oscilloscope provides five virtual instruments in one

DI-770 and WINDAQ/Scope Manual
10. The Function Generator
The DI-770 is also equipped with a function generator.
With the function generator, signals of various shapes, with adjustable frequency, symmetry, amplitude and offset.
Next to that, the function generator contains a sweep generator, which can in combination with the spectrum analyzer,
be used for creating frequency response characteristics of components or circuits.
And the function generator provides for a number of user definable preset positions.
Principle of the function generator
The function generator uses the DDS technique. DDS stands for Direct Digital Synthesis, a technique that uses digital
data processing blocks to generate a frequency-tunable with a fixed-frequency precision clock. DDS allows to
generate low distortion signals with very accurate frequency adjustment, in a fully digital way.
Structure of the function generator
The function generator is built out of a number of functional blocks.
At the top a display is located, which shows the signal shape and the other settings of the function generator. Left of
the display there are the signal shape selector buttons. Below the display are the controls for the frequency, symmetry,
amplitude and offset of the signal. At the right of the display are a key pad for numerical input and a key pad for the
presets.
This part of the screen can be hidden using the small button at the right upper corner of the display of the function
generator. The function generator will become smaller and taking up less space on the computer display. Pressing the
button again will expand the window again. The same can be obtained by pressing keys .
The Function Generator
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