There are two categories for runout:
Circular Runout measures just one circle—one row of hits—around the cylinder.
Total Runout measures multiple circles up and down the entire surface of the cylinder with multiple rows of hits.
Obviously, you are somewhat limited using a CMM for total runout because you probably will not take 100 rows of hits around your cylinder, and something as little as 3 rows of hits clearly isn’t enough for determining total runout.
Nevertheless, PC-DMIS provides you with the ability to dimension both circular and total runout and lets you determine whether or not you've measured enough rows of the cylinder.