怎样用探头共地的示波器，测试不共地两个信号的时序？

板子上两个隔离的信号，不共地，要测两个信号的上电时间延迟(difference delay)， 目前手头上有一台示波器，但是经测试，两个探头的通道是共地的，请问有什么办法达到测试的目的。
I want to measure the power up difference delay of two signal with isolation ground, but there is only a oscilloscope with two probes in hand, and these two channels are work with common ground, How to use equipment to finish the measurement? Thanks.

示波器的检测探头测到哪里，哪里就和示波器共地。两个不共地的检测点，一旦被同一个示波器检测时，它们就自动地共地。

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