The Function Generator is a voltage source that supplies sinusoidal, triangular or square waves. It provides a convenient and realistic way to supply stimulus signals to a circuit. The waveform can be changed and its frequency, amplitude, duty cycle and DC offset can be controlled. The frequency range is great enough to produce conventional AC as well as audio- and radio-frequency signals.

To place the instrument, click the Function Generator button in the Instruments toolbar and click to place its icon on the workspace. The icon is used to wire the function generator to the circuit.

The function generator has three terminals through which waveforms can be applied to a circuit. The common (center) terminal provides a reference level for the signal.

Double-click on the icon (shown above) to open the front panel (shown below), which is used to enter settings.

To reference a signal from ground, connect the Common terminal to the ground component.

The positive terminal (+) provides a waveform in the positive direction from the neutral common terminal. The negative terminal (-) provides a waveform in the negative direction.