# Checkerboard Plate Requirements

The Checkerboard calibration tool can only be used with a checkerboard-style calibration plate that meets specific dimensional requirements:

- The black and white tiles must be arranged in an alternating pattern.
- The black and white tiles must be the same size.
- The tiles should be square, or if they are not square, their aspect ratio should be within the range 0.90 through 1.10.

The following figure shows an example of a checkerboard calibration plate:

You can obtain checkerboard calibration plates that meet the requirements listed in this topic from Cognex Corporation, or you can manufacture your own plate. Keep in mind that the accuracy of the calibration you obtain depends on the precision of the manufactured plate.