Filter
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3-2
When the shutter is closed the generator will switch off, unless another shutter is still open in one of the
other tube shield positions. Alternatively. the generator can be switched off manually by operating the
GENERATOR 0 push-button. All lamps will extinguish. Before the generator is switched off the power
to
the X-ray tube should be reduced, by first turning the
mA
control to minimum, and then the
kV
control.
Any generation of HT will be inhibited if the shutter does not fully close after a close shutter command.
Fig. 3.1. Opening
the
window
shutter.
3.3.
SHUTTER CONTROL
For camera work it is usual
to
control the exposure time of the film to X-rays by using a PW 1722 timer. Two
timers can
be
fitted: the
left-hand
timer will control the shutter of either window 1 or window 2, and the
other timer the shutter of window 3 or 4. This paragraph describes the automatic and manual control of the
shutter operation.
When the camera is installed on its bracket in front of the required exit window of the tube shield, open the
shutter disc and push the camera forward until the collimator enters the hole in the disc. Ensure that the
microswitch button on the tube shield is actuated by the pin or arm of the camera.
NOTE: The space between the front of the collimator and the exit opening of the tube shield should be kept
as
small
as possible to
ensure
that radiation does
not
escape. Take
care
that
the
filter disc is free
to move, and is not damaged.