Del Medical EPEX Omniflex IV, Service Manual

Page: 102 / 238

EPEX/Omniflex IV System Service Manual
4-18 Adjustments and Calibration
X-ray Tube Warm Up
Note: This procedure can be
skipped if the tube
conditioning or seasoning
has taken place within two
hours, if the heat unit display
is 0 or the system has not
been used recently.
Before subjecting any X-ray tube to radiographic kVp or mA loading, the
tube must be warmed up to prevent possible arcing. Operating the tube at
low mA and gradually increasing the kV seasons the tube and might reveal
a faulty X-ray tube high tension cable.
To prevent damage to the X-ray tube, ensure the tube is warmed to 7 to 9% heat
units, prior to use.
Perform the tube warm up procedure from the application software screen.
(see the Operator Console Service Manual or User’s Guide for exact details
and images of the software screen)
X-ray Tube Calibration Procedure
Note: Should an error occur
during auto-calibration, an
error message displays. The
Generator limits the tube’s
operation to the range in
which it was calibrated, thus
allowing for partial operation
of the Generator. When you
reenter auto-calibration, the
tube calibration resumes from
where the error occurred.
To calibrate the X-ray tube:
CAUTION
Step Action
1 Connect the Service laptop to J11 on the CPU board via the null
modem cable.
2 From the GenWare Program setup select window, choose Set up .
3 Select Auto Tube Calibration .
The Tube Calibration menu displays.
4 Select tube 1.
The Tube Auto-Cal menu displays.
5 Select the small filament.
Note: Press Focal Spot to toggle between Small and Large.
The small focal spot displays.
6 Press and hold the X-ray handswitch to begin the calibration
procedure.
Note: This will take approximately five minutes.
This menu indicates the mA and filament current while the
Generator takes a series of exposures.
7 When auto-calibration is complete for the small filament, choose the
large filament.
8 Press Return to repeat calibration on the large focal spot.