ETS-Lindgren 2181 Turntable - Manual (Page 7)

Introduction | 7
1.0 Introduction
The ETS-Lindgren Model 2181 Turntable is an electric-powered turntable
platform system designed for use with the Model 2090 Series Multi-Device
Positioning Controller for EMI compliance testing. The Model 2181 is designed
for indoor or outdoor use, and is available in 2-meter, 3-meter, 4-meter, and
5-meter sizes.
The top of the turntable is conductive with a continuous ground brush to
electrically couple it to the ground plane. The ground brushes are attached
directly to the chamber floor by the floor flange, and are in continuous contact
with the turntable top. The brushes point downward from the floor flange.
All models utilize a pinion and gear drive with a gear reducer and electric motor
located beneath the platform. The bearing on which the turntable rotates has the
drive teeth cut directly on the outside and will easily support most Equipment
Under Test (EUT). Support for the turntable includes casters that aid in the
support of cantilevered loads on the outside of the turntable.
The turntable top is sectional to provide easy access if service is required. On
standard models, a 15-cm hole is provided in the center of the turntable to
accommodate customer supplied cabling to and from the EUT.
To prevent over-travel of the turntable in either direction of movement, hard limits
are provided in the form of pins that actuate switches located below the tabletop.
These pins allow limits to be set and allow as much as two full rotations. Rotation
speed can be varied from the front panel of the Model 2090 controller or through
the IEEE-488 interface bus.
Model 2181 Standard Configuration
T URNTABLE A SSEMBLY
Featuring continuous or non-continuous operation, the turntable assembly
includes:
• 3-phase electric motor unit
• Heavy-duty variable speed drive system
• Conductive sectional top for easy service access
• Convenient rotational limit adjust switches