dtm KEYPOINT, Сборка и руководство по эксплуатации

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9. Calibration of the proximity sensor
You can calibrate the proximity sensor at any time.
Starting the calibration:
*administrator_code#999#1#
Calibration takes place after 3 seconds. During this time,
keep your hand away from the keyboard.
Completion of calibration is signaled by a single beep.
Regardless of manual calibration, the device carries out
auto-calibration of the proximity sensor every 16
seconds. It consists in measuring and saving its value. The
average value of the last three measurements is used to
establish the approach detection threshold. Auto-
calibration is performed only when the light and
proximity detection function is turned on, the light level is
low (it is dark) and the device is in standby mode.
10. Factory reset
To restore factory settings, press on the keyboard panel:
*administrator_code#899#1#