电路图如下图所示，用万用表测量VOUTP和VOUTN对GND2的输出电压，均为0，请问这是为什么？是需要在输出和GND2之间接电阻或者其他元器件吗？
图中，3.3V_1 0.1V_1 3.3V_2均有程控电源产生，三路之间彼此隔离。
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