Newcon Optik LRB 4000CI - Manual (Page 21)

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5.6 Compass calibration
If the System was exposed to a strong magnetic field or
was not in use for a long time, the compass accuracy may
diminish.
To return the compass into working condition:

Select CALc from CAL menu
 Keeping the unit horizontally, perform one full
rotation around vertical axis within half a minute and
then one full rotation around vertical axis with device
upside down during half a minute.
 If one rotation does not restore calibration – perform
two rotations.
The normal compass functioning will be restored.
5.7 Accuracy correction
If the System produces any measurement errors that lie
beyond unit specification, it may be an indication that unit
requires calibration similar to one conducted at
production level. To do accuracy correction, please select
Corr from CAL menu.
Perform correction according to required measurement
parameters by pressing Action button, see table below: