Vaisala HMW90 - Manual (Page 71)

Chapter 5 _______________________________________________________________ Maintenance
VAISALA ________________________________________________________________________ 69
Adjustment Using Display and Trimmers
CAUTION The trimmers only turn 135 degrees each way, less than half a rotation.
Do not force the trimmer past the stopping point.
NOTE User calibration settings (adjustment by trimmers or service port) are
stored in the HTM10 module. If you replace the module, there is no need
to undo previous adjustments.
1. To enter the adjustment screen, open the slide and rotate the
RH or T trimmer slightly during normal measurement. If the
trimmer is not centered, you see the trimmer centering screen first.
Simply turn the trimmer to the center and wait for the progress bar
to complete.
1111-075
Figure 28 Trimmer Centering Screen
2. In the adjustment screen, turn the trimmer to set the desired
correction. To commit the change, stop turning the trimmer and
wait.
1111-076
Figure 29 Trimmer Centering Screen
3. If you wish to apply a greater correction than allowed by the
trimmer in a single adjustment, re-enter the adjustment screen and
apply a new correction. Corrections applied using the trimmers are
cumulative.