求翻译：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。是什么意思？

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.

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The signal generating device is refers produces needs the parameter the electricity spike instrument.May divide into the sine signal, the function according to the waveform (profile) the signal, the pulse signal and the random signal generator and so on four big kinds.

Signal generator refers to produce the required parameters of instrument of electrical test signals. Signal waveform sinusoidal signal, can be divided into functions (wave) signals, pulse and random signal generator, the four classes.