Fona XPan DG Plus - Filament Calibration and Feedback Signal Calibration

FONA XPan DG Plus
99
2.3.4. Filament calibration and Feedback signal calibration
1
RP 103
TRIMMER mA
5
TEST POINT Vs & V
2
SA101
6
R104 TRIMMER FDB
3
Ground
7
TEST POINT FDB
4
TEST POINT Kv & mA
The filament calibration is required every time a Tube Housing Assembly or a Power Switching Unit is replaced.
ATTENTION
Wait for X-ray tube cool down after each exposure.
Cool down diagrams are reported on the Operating Instructions: 5 min waiting
time is required after each 15 s panoramic of exposure at 85 kV, 10 mA (about
13000 J). If the waiting time is not maintained, then the Power Supply Unit could
be blown.
NOTE
Make sure the DC voltmeter to be used is calibrated
• Enter Service program X Ray Test / Continued X Ray mode (chapter
Continued X-Ray).
• Set the anodic voltage at 61 kV and anodic current at 10 mA.
• Switch to ON both switches SA101
• Monitor the voltage between mA point and GROUND.
• Tune trimmer RP103 (mA) for 6V during exposure.
• Switch to OFF both switches SA101.
The feedback signal (FDB) has to be calibrated after the replacement of a Power Switching Unit and the filament
calibration.
• Monitor the voltage between from FDB test point and GROUND.
• Set the anode voltage at 85 kV and anode current at 10 mA.
• Tune trimmer RP104 (FDB) for 10V during exposure.
• Exit Service Program X-RAY TEST / CONTINUED mode.