方式3 方波发生器 ( Square Ware Mode ) 采用方式3 时，OUT 端输出连续方波，若计数值N为偶数，则输出对称方波，前N/2
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采用直接数字合成（DDS）技术构建双路正弦波及同步方波发生器，实现幅值、频率、相位等连续调节；
Based on DDS technique, the signal generator can create two signals, i. e. the sinewave and the square wave signals, and its amplitude, frequency and phase can be continuously adjusted.
该函数信号发生器可输出三角波，方波和正弦波。
The generator can output three kinds of waves : sine wave , square wave , triangle wave.
此信号发生器可以方便输出正弦波、方波和指数波等各种不同波形的信号，输出信号的频率和幅值等参数可通过前面板控制。
Different signals such as sine waveform, step waveform and exponential waveform are available. Its frequency and phase can be adjusted precisely through the front panel.
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