In this video I go though how to calibrate the si5351 breakout board using the Arduino platform. I go through why we need to calibrate the clock generator and demonstrate what happens if the Si5351 is not calibrated.
You will need a frequency counter that is in reasonable calibration with a resolution of least to 10th of a Hz but 100th of a Hz resolution is better.
If you run into any problems leave a message in the comments and either I or members of the channel try to help.
In this video I am using the Etherkit library by Jason Milldrum.
For further information regarding the Etherkit library can be found on Github.
Link
https://github.com/etherkit/Si5351Arduino