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Can buffered digital edge detection only be performed using an external sample clock?

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I am working on an application where I need to measure the speed (rpm) of a motor as it starts up using the output of its built in hall effect sensor.  The sensor should output 2 pulses per revolution of the motor.  My plan is to count the pulses from when the counter (counter 1) is armed to when it is up to speed. Looking at the M series manual, the CVI (v8.5.1) help, and the examples it appears that this can only be done using an external sample clock.  Is there a way to route an internal sample clock to the appropriate terminal on the counter so that I do not need to add additional hardware?

 

I am currently using a PCI-6289, but the final application will use a CDaq-9188 chassis (using one of the the built in 32-bit counters).

 

Thank you for your assistance.


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