Preva Dental X-ray System User Manual, 00-02-1576, Revision ZA1
17
When the system is powered on, the operator panel, Figure 2, displays the
exposure settings (kV, mA, and seconds) for the currently selected tooth,
image receptor type, and patient size. Use the Tooth Selection, Image
Receptor Type, and Patient Size buttons to select other exposure settings.
For a table of the default exposure settings, refer to the Default Exposure
Settings tables on page 30.
Adjusting
Exposure
Settings
Preset exposure settings can be adjusted before making an exposure. Use the
right arrow to select the exposure setting to adjust. Use the up and down
arrows to adjust the value. To save new presets, see the System Configuration
The Preva has a visible and an audible Radiation Indicator. When an exposure
is in progress, the Radiation Indicator on the Operator Panel is illuminated and
an audible tone is heard. The exposure is complete when the Radiation
Indicator is extinguished and the audible tone is no longer heard
The Ready Indicator illuminates when the system is ready to make an
exposure. Immediately after an exposure, the Ready Indicator flashes until the
X-ray tube cools down sufficiently to make the next exposure. No exposure
can be made while the Ready Indicator is flashing.
Exposure
Button and
Radiation
Indicators
The Exposure button initiates an X-ray exposure. For a complete exposure,
the button must be pressed and held until the Radiation Indicator goes off and
the audible signal stops. Releasing the Exposure button will immediately
terminate the X-ray exposure.
•
An incomplete exposure caused by prematurely releasing
the exposure button may require the operator to make
another radiograph. When the exposure button has been
released prematurely, the system will notify the operator
momentarily and then return to operating mode.
•
30 cm during an examination can expose a patient to non-
diagnostic X-rays. Automatic shutdowns can be caused by
overcurrent relays (caused by excess electricity flowing to
the tubehead) or thermal cut-out (caused by the tubehead
exceeding acceptable temperature specifications).
It is the owner’s responsibility to provide any visual interlock
indicators required by local ordinances.
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