Vaisala HMW90 Serie Guide Rapide page 18

Trimmer Adjustment (RH and T)
Before starting the adjustment, compare
the reading of the transmitter to a
calibrated reference instrument so you
know how much adjustment is needed.
You can use, for example, the HM70 hand-
held humidity and temperature meter.
To enter the adjustment screen, select the
parameter to adjust, 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.
In the adjustment screen, turn the trimmer
to set the desired correction. To commit the
change, stop turning the trimmer and wait.
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.
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