Positional Accuracy (touchpad-positional-accuracy)

  • Article

This is to test the positional accuracy for reporting contacts on a Windows Precision Touchpad device.

Test name

  • Test.PositionalAccuracy.json

Core requirements tested

  • Device.Input.Digitizer.PrecisionTouchpad.Accuracy

Test purpose

  • Verifies that the device is able to report absolute position accurately.

Tools required

  • PTLogo.exe

Validation steps

  1. Launch Test.PositionalAccuracy.json.

  2. Follow the directions on the screen to perform 3 taps in an indicated area on the touchpad. After each set of 3 taps, the instructions will ask you move to a different area, for a total of 15 taps. If instructions say to tap in a corner, tap as close to that corner as possible.

For each iteration, do the following:

a. Tap the location specified on the screen.

Note  The specified locations are calculated as 13mm square areas. For example, if the instructions say "Top Left corner" you should tap somewhere within a 13mm square region of the top-left corner of the touchpad.

b. If no tap is registered by the device, manually fail the iteration.

Common error messages

  • "[25] packet not in expected position: XXX, YYY"

    o Tap must occur at the location specified.

    o The given values specify the logical coordinates of where the contact was reported.

    Here's a screenshot showing a contact location that is outside the expected region.

    screenshot from the positional accuracy test, showing a contact location that is outside the expected region.

Passing criteria

  • 15/15 (100%) iterations must pass in order to complete with passing status.