How to use external timebase for Two Edge Separation measurement with PCIe 6351

[thinnker]

Hi

I am working with PCIe 6351 x series DAQ card.

counter measurements.

Here i need to measure the time/no edges between two edges. Falling to Raising of two signals.

I got the measurement with internal time base.

here i need to synchronize the measurements with external clock from the external setup.

so i need to use that external clock,timebase for the counters.

Any solution please..

Regards,

Hari