ETS-Lindgren 2115 Multi-Axis Positioning Systems (MAPS) - Manual (Page 9)

Introduction | 9
The following steps were taken to minimize potential radio frequency (RF)
obstruction or distortions of RF signals from low-directive wireless transmit
antennas:
• The use of minimum composite tube materials to fabricate the rotating shaft
and EUT mounts.
• RF cable connection to the EUT is made through a 1.2-inch hole provided in
the center of the roll axis shaft.
The resultant system test data shows virtually no RF interference from the
light duty MAPS.
Model 2090 Multi-Device Controller
The Model 2090
Multi-Device Controller
(or next generation
ETS-Lindgren
controller, if
applicable) directs the
motor drives for the
upper (phi or x) roll
axis and the rotation of
the turntable (theta or
y axis).
The x-axis motor drive mounts onto a rail system that is attached to the turntable.
This system is positioned on the turntable so that the x-axis centerline projects
through the center of the turntable. The rail system has a sliding carrier that
allows the vertical support assembly to be moved in or out, in a six-inch
(15.2 cm) range, from the center of the turntable. The sliding carrier enables the
movement of the EUT in or out in the same range.
To minimize any potential RF obstruction or distortion of RF signals from
low-directive wireless transmit antennas, each positioning system is provided
with fiber optic control lines that enable the I/O signal between the motor base
and the Model 2090 controller.
Masts
The MAPS mast is a dual-axis angular positioning system capable of rotating the
EUT on the center of both rotation axes with 360 ° angular span while keeping
the EUT on the center of both rotation axes. The angular accuracy is guaranteed
within ± 0.25 ° for both axes. The two axes can be controlled independently
through the controller or measurement software