Nokia 5140 Manuales De Servicio
Nokia Customer Care
System Module and User Interface
NPL-4/5
Issue 1 05/04
Copyright © 2004 Nokia Corporation. All rights reserved.
Page 59
Compass calibration SW
Calibration is needed for compensate external magnetic field and improve performance
of compass reading accuracy.
of compass reading accuracy.
User assisted calibration
UI SW menu structure
•
User select checked horizontal plane with no disturbance near of phone
•
With very slow rotating (about 10s / round) MCU SW will find values for compensation
during one round.
during one round.
•
SW calculates calibration values
Compass declination menu
Used for setting compensated declination angle. Declination values is accessible from
special maps or lists of places. Declination angle value varies about ±25° depending geo-
graphical place on earth.
special maps or lists of places. Declination angle value varies about ±25° depending geo-
graphical place on earth.
Supply interface for manual calibration, used also for resetting calibration values