6. A general-purpose function generator. While sine and square waves are popular test signals, I have often found triangular waveforms to be invaluable when searching for nonlinearities. Sometimes you need two function generators, one to sweep the operating point of the DUT, slowly, back and forth over its operating range, while you watch the response of the output to a small quick square wave-watching for oscillation or ringing or trouble.
蓝色字体那句，第一个扫频，第二个信号发生器到底要干嘛？ |
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