16
Setting Geographic Data for the ET Report
In addition to temperature, relative humidity, wind speed
and solar radiation data, the Penman
-
Monteith algorithm
used by the 2900ET statopm uses the station latitude and
altitude to compute reference ET. These are input as fol-
lows:
1.
Press
Display
.
2.
Press
Set
.
Select Parameter
To Be Set
(↑↓)
4.
Press
Set
.
Set LATITUDE Now
Select LAT
(↑↓)
3.
Use the arrow keys to
scroll to the
‘
ET Values
’
option.
SET ET VALUES
Press SET
5.
Use the arrow keys to
scroll to the desired
latitude. Take care
that N precedes the
latitude angle if the
station is in the north-
ern hemisphere.
Set LATITUDE Now
LAT=N45
o
Hit Set
6.
Press
Set
to set the latitude
angle.
Set ALTITUDE Now
Select ALT
(↑↓)
8.
Press
Set
to set the altitude. LCD will return to the
‘
Current Values
’
screen.
7.
Use the arrow keys to scroll
to the desired altitude.
Set ALTITUDE Now
ALT=500Feet
