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Contact accuracy

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This is to test the contact position reporting accuracy of a Windows pen device.

Test name

  • ContactAccuracy

Core requirements tested

  • Device.Input.Digitizer.Pen.Accuracy

Test purpose

  • Verifies that while the pen is in contact with the screen, the physical contact with the device matches the contact position that the device reports - within allowed limits.

Tools required

  • PT3 device with Pen holder + 150g weight.

Validation steps

  1. Run the test case for Contact Accuracy.
  2. Following the directions on the screen, tap at the center of the circle located at the cross hair. For each iteration:
    1. Tap the center of the location specified on the screen.

Here's a screenshot from the Contact Accuracy test.

screenshot from the contact accuracy test for a windows pen device.

Common error messages

  • "Contact distance from target too large:[hm]"

    Occurs if the tap is too far away from the center of the target. Distance given in hundredths of a millimeter.

Passing criteria

  • 14/16 test iterations must pass for test success.
  • This test has an allowed tolerance of 0.1mm, therefore a recorded contact accuracy <= 0.6 mm will result in a pass.
  • Any iteration that is 0.1mm beyond accepted tolerance, resulting in a recorded contact accuracy >= 0.7 mm, will fail the entire test.