Vaisala WAT12 - Manual (Page 31)

Chapter 3 __________________________________________________ Installation
VAISALA__________________________________________________________29
Alignment
After mounting the WAT12 transmitter to the mast, check
that the WAV151 end of the cross arm is pointing to north
with the required accuracy, see Figure 21 on page 27. For
ensuring correct assemblage after aligning the WAT12, you
can mount the sensors on it only in one way.
Verification
If the signal cable from the WAT12 transmitter is connected
to the data collection system and the system is powered up,
check that the wind readings react correctly. For testing the
anemometer, rotate the cups manually. For testing the wind
vane, hold the vane in a few fixed angles and verify data.