Solution
Use Exported Reference Frequency Output property from the NI‑USRP API to export the 10 MHz clock from the USRP. The below picture depicts a modified shipping example which uses this property.
Note: This image is a LabVIEW snippet, which includes LabVIEW code that you can reuse in your project. To use a snippet, right-click the image, save it to your computer, and drag the file onto your LabVIEW diagram.