Preva Installation/Service Manual, 00-02-1577, Revision E01
74
Devices with firmware revision of 5.0 and below will require calibration of the
tube current. Contact Midmark at the number listed in the manual for
calibration instructions.
Occasionally, it may be necessary to calibrate kilovoltage (kV). Approximate
mA and kV levels can be observed using the Diagnostic Mode feature of the
Preva system. If the kV needs calibration, follow these steps.
2. Press and hold the Tooth Selector switch and the Patient Size Selector
switch for five seconds.
3. Select the SET CONFIG option. The Set Configuration menu, Figure 53
will be displayed.
4. Press the down arrow to highlight the DIAGNOSTIC MODE ON option,
and press Enter. The Configure Unit menu, Figure 52 will be displayed.
5. Press the down arrow to highlight the Exit option, and press Enter. This
displays the Menu Option screen, Figure 49.
6. Press the down arrow to highlight the Exit option, and press Enter. This
returns the display to operational mode.
7. Press Enter to select the kV to be adjusted.
8. Press Enter to highlight the time to be adjusted.
9. Observe normal radiation protection procedures in preparation for the
following steps.
10. Make an exposure.
11. Observe the feedback values.
during
Calibration
1. Press the Up switch to activate the Adjust feature. This displays the
Current kV Modulation Level screen.
2. Press the Up or Down switch while observing the Counts indicator.
3. Adjust the Counts in small increments.
4. Press Enter to exit and return to operational mode.
5. Make an exposure and observe the feedback.
6. Repeat steps 1 – 5 until the desired kV level is reached.
Calibration
Session
Once completed, it is necessary to deactivate the calibration session.
1. Press and hold the Tooth Selector switch and the Patient Size Selector
switch for five seconds. The Menu Options screen, Figure 49 will be
displayed.
2. Press the down arrow to highlight the CONFIGURE UNIT option, and
press Enter. This displays the Configure Unit menu, Figure 52.
3. Press the down arrow to highlight the Set Configuration option, and press
Enter. The Set Configuration menu, Figure 53 will be displayed.
4. Press the down arrow to highlight the Diagnostic Mode Off option, and
press Enter. This displays the Configure Unit screen.
5. Press the down arrow to highlight the Exit option, and press Enter. This
displays the Menu Option screen.
6. Press the down arrow to highlight the Exit option and press Enter. This
returns the system to operational mode.
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