DAVIS Weather Monitor II Troubleshooting Guide download pdf (Page 41)

Rainfall

Weather Monitor II Page 37

RAINFALL

Each station uses a rainfall calibration number (CAL) to determine how much

water each bucket tip (i.e., pulse) represents. The default calibration number

for rainfall assumes that you use a 0.01” rain collector.

CALIBRATED RAINFALL = # OF PULSES X (1 / CAL)

Default CAL = 100 (for 0.01" rain collector).

If you have a 0.2 mm rain collector, you must change the calibration number.

First adjust the console to display rainfall in millimeters and then change CAL

to 0005. (For instructions on how to change CAL, see “Changing Calibration

Numbers” below). Be aware that the console will revert to its default calibra-

tion (i.e., inches) if it loses power.

Note: Make sure you display rainfall in the appropriate units of measure before changing CAL; otherwise

you will be setting the wrong calibration number. If, by mistake, you change CAL before switching to

the appropriate units, you can rectify the error by switching to the appropriate units and then enter-

ing the appropriate CAL (for millimeters, 0005; for inches, 0100).

Once the console is calibrated for 0.01” (default) or 0.2 mm, you can switch the

display units as often as you like; the console accurately converts rainfall

amounts regardless of the type of rain collector you use.

CHANGING CALIBRATION NUMBERS

1. Press the appropriate key (e.g., TEMP, RAIN, etc.) to display the reading whose CAL

number you wish to change.

2. Press UNITS to display the desired unit of measure.

3. If you are changing the CAL for wind speed, temperature, or humidity, press the key

you pressed in step 1 (i.e., WIND, TEMP, or HUM) again so the reading you do NOT

want to change appears in the display.

For example, to change outside temperature, display inside temperature. If you

are changing the CAL for rain, skip to step 4.

4. Press the key you pressed in step 1 and hold the key down.

After a few seconds, the display will begin to alternate between the word CAL

and the reading you want to change. After a few more seconds, the current cali-

bration number appears.

5. Use ENTER to set CAL. (See “Using the Enter Key” on page 16 for instructions.)

If you want to enter a negative CAL for temperature or humidity, ﬁrst enter the

number without the negative sign. Then return to the second digit on the left and

hold down ENTER. The display cycles through the possible entries, one of which

is a negative sign.

Note: If you do not begin entering numbers within the ﬁrst second after you select a digit, the display will

exit calibration mode and return to its normal display.

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DAVIS Weather Monitor II Troubleshooting Guide Page 41