Difference between Uniformity: Working Plane vs. Calculation Object

Hi!

I have a question related to the difference in the result of the uniformity, when the calculation is done through the working plane or the calculation surface. I've recently had this problem on several projects.

I attach an image where you can see the difference between the uniformity of the working plane and the calculation surface. The position of the calculation surface is 0.80 m.

I know that the mesh or the way of calculating with the working plane and the calculation surface is different and that is perhaps why it could affect the working plane so much, but previously this problem did not occur.

I would need to rely on the calculation of the working plane since, for example, when it comes to showing the calculation of the specific connection power with the working plane in results, I need this calculation to be reliable and be linked to a working plane with reliable uniformity calculated.

Thank you so much

working plane:

calculation object:

4 replies