18 XTM0522-B1 XT H 225 X-ray System
3.2 Electrical
The following warnings are identified as hazards:
• High voltages are necessary for the production of X-rays. Whilst under normal
operating conditions these do not pose a problem, care should always be taken to
ensure that equipment is not exposed, damaged or operated in an unsuitable
environment, for example, wet or very damp conditions.
• When isolating power from the system, shut down the computer first to prevent data
loss.
• Check that the electrical supply is suitable according to the equipment's rating label.
The following warnings are identified as mandatory actions which must
be followed to prevent a hazard:
• The X-ray system operates at hazardous voltages and so access to service areas is
restricted to suitably skilled technicians. Panels covering high voltage components
are clearly labelled; the system must be isolated from the electrical supply before
working on these areas.
• All electrical maintenance must be carried out by a qualified Nikon Metrology service
engineer.
The following warnings are identified as prohibited actions that must
not be performed:
• Never carry out any maintenance work on the X-ray source while X-ray power is on.
• Never disconnect any cables while the system has electrical power.
• Never disconnect any earth connections when the system has electrical power.
• Do not adjust, make or re-make any electrical power connections whilst the system is
connected to a live supply.
• Do not attempt to disconnect any of the high voltage connectors. The high voltage
connectors should only be worked on by trained service engineers, with system
power isolated.
3.3 X-ray source assembly
The following warnings are identified as hazards:
• Take care not to trap fingers when opening and closing the X-ray source assembly to
change the filament.
• When the system has been operating at high power, the components of the X-ray
source and focus cup may become hot and care must be taken when handling these
parts.
• Ozone build-up in the cabinet is possible if the target window is damaged and
electrons are allowed to escape through to atmosphere. Auto-defocus should prevent
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