DAVIS Vantage Pro2 Plus User Manual page 41

Problem
Wind speed reading seems
too high or too low.
Wind speed reads 0 either
all the time or intermittently
Dew Point reading seems
too high or too low
Outside temperature sen-
sor reading seems too high
Inside temperature sensor
reading seems too high
Outside temperature
seems too low
Inside temperature sensor
reading seems too low
Wind direction reading is
dashed out
Wind direction always says
north
Wind chill reading seems
too high or too low
Heat Index reading seems
too high or too low
No rain readings
Readings are too high
Incorrect times for sunrise
and sunset
T 4-1: T
ABLE ROUBLESHOOTING
For low readings, remove wind cups and check for friction
sources. Check the anemometer location. Is it sheltered from
the wind? See ISS manual for additional wind speed
troubleshooting information.
The problem may be with the anemometer. Test anemometer
by spinning wind cups. Check anemometer switch fields on di-
agnostic screen (see page 39) and call technical support.
Check calibration numbers for temperature. Dew point depends
on temperature and outside humidity. Make sure they are
working.
Check to see if ISS is near mechanical or radiant heat source.
Check calibration number and adjust if necessary. ISS or temp
sensor may need to be relocated. See ISS or other transmitter
manual.
Move the console out of direct sunlight. Make sure that the
console or sensor is not in contact with an exterior wall that
heats up in sunlight or when outside temperature rises. Make
sure the console or sensor is not near a heater or other internal
heat source (lamps, appliances, etc.). Also make sure the
console backlight is not on. Check calibration number and
adjust if necessary.
Check calibration number and adjust if necessary. Sprinklers
may be hitting the ISS radiation shield. Relocate. See ISS
manual.
Make sure the console or other temperature sensor is not in
contact with an exterior wall that cools down when outside
temperature drops. Make sure the console or other temperature
sensor is not near an air conditioning vent. Check calibration
number and adjust if necessary.
• Wireless model - check reception. See Reception
Problems below.
• Cabled model - cable may be faulty.
If these steps do not reveal the problem, the anemometer may
be faulty. Call technical support.
Usually a problem in the ISS, either with the transmitter or
anemometer cable. See the ISS manual for troubleshooting in-
formation.
Check calibration numbers for temperature. Wind chill depends
on temperature and wind speed. Make sure they're working.
Check calibration numbers for temperature. The heat index
depends on temperature and outside humidity. Make sure the
sensors are working.
Make sure cable-tie is removed from inside the rain collector.
See the ISS manual.
Can be caused by high thin cirrus clouds.
Check your latitude, longitude, time zone, date and daylight
saving time settings. Sunrise and sunset times are calculated
from the console using all of these settings.
Vantage Pro2 Troubleshooting Guide
G
UIDE
Solution
37