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A function generator is a very versatile instrument that is extensively used in electronics, mechanics, bioengineering, physics and many other fields. It allows you to create a wide variety of synthesized electrical signals and waveforms for testing and diagnostic applications. The most common functions are the sine, square, triangle and ramp functions. In order to set the amplitude, frequency and offset voltage of a waveform, one needs to enter numbers. Numbers can be entered in …

…categories that depend on weather the trigger signal is provided internally or externally. The source makes no difference in how the trigger circuit operates. But internally triggering means your scope is triggering on the signal that it is displaying. That has the obvious advantage of letting you see where you are triggering. If the trigger level is moved away from the triggering source (crossing the trigger threshold), makes the displayed wave move left and right.