Davis Instruments 7911 User Manual

Testing the Anemometer
2
• Stainless Steel Hose Clamps
• Small Screwdrivers
• Adjustable Wrench
• Hand-Held Compass or Local Area Map
Testing the Anemometer
Before beginning your installation, follow the instructions below to test the
anemometer wind speed and wind direction functions.
1. Connect the anemometer cable to the appropriate connector on your
junction box.
2. Push the wind cups onto the smaller of the two stainless steel shafts at the
end of the arm.
3. Spin the wind cups gently. You haven’t secured them yet, and if you spin
them too hard you may knock them off.
4. Check the display on your weather station to make sure you are getting a
wind speed reading.
5. Grasp the upper, larger of the two stainless steel shafts at the end of the arm
with your fingers and twist the shaft about 1/2 turn.
6. Check the display to make sure the wind direction reading on your display
changes.
Note: The wind direction readings will not change as rapidly as you turn the shaft. The station uses a low
pass filter to smooth out the constant small shifts in wind direction and keep the direction display from
jumping about in gusty winds.
7. Disconnect the cables when you are finished testing the anemometer.
Assembling the Anemometer
Attach the wind cups to the anemometer and check the mounting base
orientation before you install it.

Davis Instruments 7911 Specifications

Wind Direction

accuracy	±3°

Wind Speed

range	0 to 200 mph, 1 to 322 kph, 1 to 173 knots, 0.5 to 89 m/s
accuracy	±2 mph, ±3 kph, ±2 knots, ±1 m/s, ±5%