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How to check if an external clock reference is present?

Hi,

I have an NI5911 flexable resolution digitizer and use NI SCOPE drivers.

I currently use PFI1 as an input for an external 10MHz reference which
works fine until it is disconnected.
The question is can I some how detect an external reference is there, so
when I initialise the device it can make the decision on whether to use
the internal or external reference?

Thankyou Tim
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