Auto-Memory For Stored Values - La Crosse Technology WS-2308AL Operation Manual

Hysteresis
To compensate for fluctuation of the measured data, which may
cause the weather alarm to sound constantly if the measured reading
is close to user set level, a hysteresis function has been implemented
for each weather alarm. For example, if the high temperature alarm is
set to +77°F and the current value moves to +78°F, the alarm will be
activated (if it has been enabled). Now when the temperature drops to
+76°F or below and thereafter again increases to beyond +77°F, the
data will be blinking, but no alarm will be activated. It has to drop to
below +75.2°F (with a pre-set hysteresis of 1.8°F) so that the alarm
can be produced again. Hysteresis values for the various weather
data types are given in the following table:
Weather data
Temperature
Humidity
Air pressure
Rainfall 24h
Rainfall 1h
Wind
16. Auto memory for stored values
The base station has a memory back up system, which is used to
memorize user-defined settings for when the batteries are changed or
if a power failure occurs. User defined units are automatically updated
each time these are changed. The base station will memorize the
following user defined units:
•
Time zone
•
12/24h time display mode
•
Unit settings (temperature, pressure, rainfall, wind)
•
Air pressure offset for calculation of relative air pressure
•
Weather picture threshold
•
Storm warning threshold
•
LCD contrast
•
Alarm time
•
Weather Alarm thresholds
•
State of alarms (enabled/disabled)
•
Rainfall total value and reset time/date
Hysteresis
1.8°F
3% RH
0.0295 inHg
0.1968 inch
0.01968 inch
3.1 mph
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