Kipp&Zonen POM-02 Sky Radiometer - Manual (Page 6)

Installation check This step is required after first installation.
After start of measurement, open “Manual Operation” and carry out next installation check.
Installation accuracy can affect value of direct sun measurement. Especially in the early morning,
sun sensor can't respond even when it is clear sky because sun light is very weak. Skyradiometer
performs with calculation mode. Then as sun altitude is increasing with time, Skyradiometer can
perform with sun sensor mode. Skyradiometer can receive data at accurate sun position. Here, if there
is big position difference, there could be apparent data jump up at when skyradiometer auto-changes
its mode. Same event could occur in the evening. Therefore user is required to place skyradiometer
with enough accuracy.
1 Press “Check” at the “Origin Offset Adjust”
2 Software shows the position accuracy between “Sun Position” and “Motor Position”
3 1deg position accuracy, it means installation is succeeded.
4 1deg position accuracy, it means user needs more adjustment for tracker direction.
Sun Position Motor Position Turn tracker to west (clockwise)
Sun Position Motor Position Turn tracker to east(counterclockwise)
5 Press again “Check” and make sure azimuth accuracy is less than 1 deg. Press “Close” to return to
operation.
In case tracker is mounted with bolts on the platform and user can not turn tracker direction, press
button “Adjust”, this means software temporarily meet motor position to sun position. But this
adjustment is not memorized. This button is necessary if user closes software and restarts it again.