XT H 225 X-ray System XTM0522-B1 19
damage to the target. In case of target damage sufficient for generation of ozone,
image brightness/quality degrades significantly.
The following warnings are identified as mandatory actions which must
be followed to prevent a hazard:
• In normal use, always switch X-ray generation off via the X-ray zone in Inspect-X prior
to opening the operator door, never by relying on the door interlocks.
• When the system has been operating and the source is opened for service
operations, the internal source components must be grounded to the source body
using an insulated-handled screwdriver prior to any physical handling.
The following warnings are identified as prohibited actions that must
not be performed:
• Do not start the turbo pump with the X-ray source open, for example when changing
the filament.
• Do not leave the system unattended while conditioning the source.
3.4 Vacuum system
To maintain the quality of vacuum required to ensure that the high voltage inside the X-ray
source can be maintained without flashover, and the electron beam is not unduly dissipated
before reaching the target, a two-stage pumping system is used. The first vacuum pump is
generally known as a 'backing' pump. This pump alone is, however, not adequate to produce
the vacuum required for generating X-rays. A second turbomolecular (turbo) vacuum pump is
necessary to bring the vacuum down to the required level.
The following warnings are identified as hazards:
• Damage may occur to the turbo pump if its cable is connected or disconnected whilst
the system is powered up.
• The backing pump will be hot to the touch during normal operation of the equipment;
let the backing pump cool to a suitable temperature before handling.
The following warnings are identified as mandatory actions which must
be followed to prevent a hazard:
• Only vent the vacuum system to atmosphere when the X-ray Power button (and
therefore, the vacuum system) is turned off, and do so very slowly, especially at the
start.
• If the backing pump emits visible fumes or smells, power off immediately. This will
usually indicate a serious vacuum leak, such as incorrect sealing of the X-ray source
lid, an open vent valve, or incorrectly fitted turbo pump or vacuum gauge. Fumes
emitted by the pump under these conditions may be harmful, and should be avoided.
The following warnings are identified as prohibited actions that must
not be performed:
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