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why use low frequency signal to trigger high frequency?

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mpig09

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Dear all:

I have a question on scope?
==>If there are two signals need to measure on a scpoe, one is low frequency signal
and another is high frequency signal, why we need to choose the low frequency
signal as trigger source?

Thanks.
mpig
 

flatulent

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That way the low one will be stationary on the display. If you triggered on the high one the low one would be at a different phase each sweep and be seen as a blur.
 

mpig09

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Dear flatulent:

Do you mean when I use low frequency signal as trigger source, each trigger edge will sweep the high frequency signal on the scope, so I can see these two signal more stationary?

If I am wrong, could you help me to describe more detail?

mpig
 

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