DAVIS Weather Wizard III - Manual (Page 30)

Inside and Outside Temperature
Weather Wizard III Page 29
7 . C
A L I B R A T I O N
N
U M B E R S
Calibration (CAL) numbers are used to turn raw data from the sensors into
meaningful readings on the display. The standard or default CAL numbers are
automatically entered by the unit when it is first powered up and whenever
power is lost and later restored.
Calibration numbers should not be changed except for certain specialized
applications. This section explains why you may wish to change CAL, the
equations used by the Weather Wizard III, and the default values for CAL
numbers. For instructions on changing CAL, see “Changing Calibration Num-
bers” on page 30.
Note: We do not recommend changing the preset calibration numbers unless you are using a metric rain
collector.
I NSIDE AND O UTSIDE T EMPERATURE
Change CAL if you wish to adjust the Weather Wizard III so that it reads the
same as another thermometer. Note that there are individual CAL numbers for
both inside and outside temperature. If you change CAL for outside tempera-
ture, the wind chill reading will also be affected.
C ALIBRATED T EMPERATURE = T EMPERATURE + CAL
Default CAL = 0 (for ˚F); 0 (for ˚C).
W IND S PEED
The four units of measure provided are generally sufficient for most applica-
tions. If you change CAL for wind speed, the wind chill readings will be incor-
rect.
C ALIBRATED W IND S PEED = R EVOLUTION X (1600 / CAL)
Default CAL = 1600 (for mph); 995 (for kph); 1843 (for knots); 3578 (for m/s).