Chapter 2: Safety and Regulatory
Optima XR220amx X-Ray System 54400222-1EN Rev 1 DRAFT 11092010 2-15
Operator Manual © 2010 General Electric Company. All rights reserved.
Collimator
The table below describes the collimator controls and the radiation field.
Noiseless (clean) earth (ground) identifies any terminal of a specially designed
earthing system where noise from earth of leads will not cause a malfunction of
the equipment.
Protective earth (ground) identifies any terminal which is intended for
connection of an external protective conductor to protect against electrical
shock in case of a fault.
Frame or chassis identify the frame or chassis terminal.
Equipotentiality identifies terminals that bring the various parts of equipment or
systems to the same potential when connected together. These terminals are
not necessarily at earth (ground) potential. The value of the potential may be
indicated next to the symbol.
Table 2-8 Collimator descriptions
Symbol Description
Control for indicating radiation field by using light.
Identifies controls for opening the collimator blades, or indicates partially or fully
open state.
Identifies controls for closing the collimator blades, or indicates closed state.
Indicates the collimator blades are closed. The controlled blades are shown in
thicker lines.
Table 2-7 Ground types
Symbol Description
DRAFT REVIEW COPY
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