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ULN2803输出问题

Other Parts Discussed in Thread: SN74AUC2G240

大家好:我想问下,当ULN2803输入端输入为高时,输出端为低电压,这时候使用万用表电阻档测量输出端与地之间的电阻,其结果会是怎样的?是处于导通状态,还是说这样测量方法错误,不能这样测?为什么?     我这样测量其结果为一个很大的电阻值在MΩ级别,请问是什么原因啊?