信号发生器是指产生所需参数的电测试信号的仪器。按信号波形可分为正弦信号、函数（波形）信号、脉冲信号和随机信号发生器等四大类。信号发生器又称信号源或振荡器。各种波形曲线均可以用三角函数方程式来表示。能够产生多种波形，如三角波、锯齿波、矩形波（含方波）、正弦波的电路被称为函数信号发生器。-Signal generator is to generate the required parameters of the electrical test signal equipment. Sinusoidal waveform can be divided by the signal, function (waveform) signal, the pulse signal and random signal generator and other four categories. Signal source or signal generator, also known as the oscillator. Curves of various waveforms can be used to represent the trigonometric equation. Can produce a variety of waveforms, such as the triangle wave, sawtooth wave, square wave (including square), sine wave signal generator circuit is called a function.