Rohde & Schwarz R&S ATS1000, Instruction Handbook Manual

Page: 59 / 81

Operation
R&S
®
ATS1000
59 Instructions Handbook 1179.2983.02 ─ 01
Absolute turntable position
To control the turning positions, the chamber has an absolute position encoder and a
mechanical limit switch in each positioner drive. The turntable also has a light barrier
sensor:
●
The position encoders constantly monitor the absolute position. Reference the
turntable's encoder after start-up; see "To reference the turntable" on page 57.
See also Chapter 9.2.1, "Positioner Loses Absolute Position" , on page 73.
●
The mechanical limit switches detect the tolerable extreme positions and prevent
over-rotation. When one of these positions is reached, the switch stops the rotation
and moves the positioner back to the closest default end-of-range.
●
The light barrier in the turntable is a backup to detect the two default positions 0°
and 360°, which are the recommended limits of rotation. When the light barrier is
reached, the color of the positioner arrow in the controller's display briefly changes
to red.
Note that before referencing, the readout of the turntable's encoder can show arbitrary
values, possibly far off the physical value. Therefore, during referencing, the readout
can exceed the limited turning range significantly. For example, turntable readout val-
ues >400° are possible. When the turntable reaches its mechanical limit switch during
referencing, it turns 15° back in the direction of the light barrier and sets this position as
0° and 360° respectively.
Figure 7-11: During referencing, ignore the red arrows (left) and turntable angles outside of the range
from -15° to +375° (right)
The following chapters describe only the most common use cases for moving the ele-
vation arm or the turntable. If you are an expert user , refer to Chapter 1.2.2, "Configu-
ration Manual" , on page 8, for more information on the positioning system..
● Moving the Elevation Positioner ..............................................................................60
● Moving the Azimuth Turntable ................................................................................ 61
● Combining the Elevation and Azimuth Movements .................................................62
Operating the Positioning System