24H2 HLK Windows Touch test error

Question

Hello sir,

I have passed the touch device test using the 23H2 HLK tool.

However, when the 24H2 HLK tool was released, I retested the same device and confirmed that a fail occurred.

The error message is "[HID] Invaild scan time (Drifted from wall clock) Max drift:169 Actual:202".

I would like to know in detail why this error occurs and what "max drift" means.

I look forward to your help. Thank you.

Answer 1

Hello,

Thank you for posting in Q&A forum.

This error usually involves synchronization issues between the scanning time of the touch device and the system clock. Specifically:

Max drift: This refers to the maximum allowable difference between the scanning time allowed by the touch device and the system clock. The maximum drift value set by the 23H2 HLK tool is 169 milliseconds.

Actual drift: This is the actual difference between the scanning time of the touch device and the system clock measured during the testing process. In your test, the actual drift value measured was 202 milliseconds.

The reason for this error is that the difference between the scanning time of the touch device and the system clock exceeds the preset maximum allowable drift value (169 milliseconds). Here are some possible reasons:

Device firmware issue: Touching the firmware of the device may result in inaccurate timing, leading to scanning time drift. It is necessary to ensure that the firmware and drivers of the touch device are the latest version. Manufacturers usually fix known issues in new versions.

Driver issue: The driver of the touch device may not properly handle time synchronization, resulting in actual drift exceeding the maximum drift value. Recalibrate the touch device according to the guidance provided by the manufacturer to ensure accurate timing.

Hardware issue: The hardware of the touch device may have defects, resulting in inaccurate time measurement.

System load issue: During the testing process, excessive system load may affect the performance and time synchronization of touch devices.

If the above methods are ineffective, it is recommended to contact the device manufacturer for further technical support.

Best regards，

Jill Zhou

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