Elevation / Azimuth

The Elevation / Azimuth tab sheet is used (for instance) to change the observation angle during a measurement in HALTED mode. If Reset Position is checked, the stepper is reset to its original position after leaving the diagnostics menu. If the user wishes to keep the new position he must uncheck Reset Position. 
Elevation stepping positions can be set relative in stepper units (600 units correspond to a full turn) or absolute in DEG. Since the stepper can move to both sides of the radome window, the azimuth angle flips from 0° to 180° when the mirror crosses the zenith direction.
The absolute elevation stepper positions are as follows:

•	Zenith: +90°
•	Horizontal: 0°
•	Ambient target: -90°

 The angular stepper resolution is 0.6°. The azimuth value of 180° is usually not used (only in Sky Tipping Bilateral Mode). The angle range elevation 0-90°, azimuth=0° is the active quadrant and is marked on the outside radiometer housing by a red arrow.
The Azimuth sub-window is only visible if an azimuth controller is connected to the host PC.
The same is valid for the infrared radiometer elevation sub-window which is only shown if the motorized IRR option is installed (see operating manual, section 8.3).