DAVIS Weather Monitor II Troubleshooting Guide download pdf (Page 40)

Calibration Numbers

Page 36 Weather Monitor II

7. CALIBRATION NUMBERS

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 Monitor II, and the default values for CAL

numbers. For instructions on changing CAL, see “Changing Calibration Num-

bers” on page 37.

Note: We do not recommend changing the preset calibration numbers unless you are using a metric rain

collector.

INSIDE AND OUTSIDE TEMPERATURE

Change CAL if you wish to adjust the Weather Monitor II so that is 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.

CALIBRATED TEMPERATURE = TEMPERATURE + CAL

Default CAL = 0 (for ˚F); 0 (for ˚C).

WIND SPEED

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.

CALIBRATED WIND SPEED = REVOLUTION X (1600 / CAL)

Default CAL = 1600 (for mph); 995 (for kph); 1843 (for knots); 3578 (for m/s).

HUMIDITY

Change CAL if your outside humidity reading is off by a consistent amount. A

CAL number exists for outside humidity only. If you change CAL, dew point

readings will also be affected.

CALIBRATED HUMIDITY = HUMIDITY + CAL

Default CAL = 0%.

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DAVIS Weather Monitor II Troubleshooting Guide Page 40