DIAG: Detecting digitizer issues by drawing a grid

Overview

Drawing a regular grid on your tablet can help diagnose certain kinds of problems, such as:

• Digitizer failure. See TSG: Pen skipping vertical or horizontal bands, where regions of the tablet simply do not detect the pen.

• Electromagnetic interference, where things like magnets distort straight lines.

The Grid to draw

How many lines do you need on the grid? The example below shows roughly the grid to draw.

The example below might also be enough.

But the example below is definitely not enough.

Try to draw them with a ruler, or just try to draw them straight enough by hand. It's important that your lines aren't too "wobbly," otherwise they will interfere with diagnosing problems.