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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
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所有的 NI 信号产生器 (NI 54xx) 阻抗都是输出阻抗 50 欧姆的信号源。这可以被看做是个理想的电压源串联一个 50 欧姆的电阻。当从这类信号源测量一个信号的时候,你应该要跟输出阻抗匹配。当阻抗匹配时,信号源阻抗跟负载有相同的电压。在这个情形下,你捕获取到期望的信号。
TDS1002B 示波器有 1M 欧姆的输入阻抗,所以会吸取信号源几乎所有的能量。这就会导致观察到的振幅会是兩倍。要解决这个问题,你可以将將 NI 信号发生器 (NI 54xx) 的 load impedance 设定为 > 1M 欧姆。
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