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User’s Guide ______________________________________________________________________
Present Weather Detector
The Present Weather Detector PWD11A is installed on the short arm of
the TACMET MAWS tripod. Avoid setting the system up near high
brush or grass, because foreign objects in the sample volume may cause
sudden changes in the scatter signal.
Cloud Ceilometer
Align the ceilometer with the optical window pointing away from the
sun (north in the northern hemisphere, whereas south in the southern
hemisphere) to keep excess sunlight from out of the sensor.
Make sure that the ceilometer stands firmly on the terrain. The unit does
not have to be mounted vertically straight, because the unit is equipped
with two tilt-angle sensors.
Lightning Detector
The main siting consideration for Lightning Detector SA20M is
interference from local obstructions. Any conducting object that
presents a profile of approximately 30 degrees, or more, above the
horizon of the antenna ground plane is an obstruction (see Figure 26 on
page 40).
Figure 26
9904-024
SA20M Vertical Obstruction (Side View)
The horizontal angle obstructed by an object should not be greater than
5 degrees; larger angles than this will affect accurate reporting of strike
bearing in the direction of the object as shown in Figure 27 on page 41.
The size of the obstruction dictates the degree of the inaccuracy.
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