Introduction to
Epsilon
Technical Manual
Technical Manual P/N 9894.00.G6
xv
5.7 ION CHAMBER SETUP & AEC CALIBRATION..................................................................................... 5-15
5.7.1 Ion Chamber Setup ......................................................................................................................................... 5-15
5.7.2 AEC Calibration Procedure ........................................................................................................................... 5-16
5.7.2.1 AEC Calibration Concept ..................................................................................................................... 5-16
A) AEC Feedback Gain Adjustment:........................................................................................................... 5-16
B) Film-Screen Correction (kV Compensation) ........................................................................................ 5-17
5.7.2.2 AEC Chamber’s Fine-Tuning Procedure ........................................................................................... 5-18
5.8 IMAGE BRIGHTNESS ADJUSTMENT ....................................................................................................... 5-20
6.0 USER ACCEPTANCE TESTS .................................................................................................... 6-1
6.1 OPERATOR CONSOLE ACCEPTANCE TEST ...........................................................................................6-2
6.2 ACCURACY OF LOADING FACTORS..........................................................................................................6-3
6.2.1 kV Accuracy.........................................................................................................................................................6-3
6.2.2 mA Accuracy .......................................................................................................................................................6-4
6.2.3 mAs Accuracy......................................................................................................................................................6-5
6.2.4 Irradiation Time Accuracy.................................................................................................................................6-6
6.3 REPRODUCIBILITY OF LOADING FACTORS .........................................................................................6-7
6.4 LINEARITY OF LOADING FACTORS....................................................................................................... 6-12
6.5 CONSTANCY OF AEC MODE...................................................................................................................... 6-15
6.6 AUTOMATIC EXPOSURE CONTROL LIMIT.......................................................................................... 6-18
6.7 FLUORO
MODE................................................................................................................................................. 6-18
6.7.1 Fluoro Console................................................................................................................................................. 6-18
6.7.2 Fluoroscopic Entrance Exposure Rate ........................................................................................................ 6-18
7.0 TROUBLESHOOTING
& SERVICING.................................................................................... 7-1
7.1 WARNING...............................................................................................................................................................7-3
7.2 EXPOSURE
INHIBITION ..................................................................................................................................7-3
7.2.1 Exposure Limits..................................................................................................................................................7-3
7.2.2 Interlock Conditions...........................................................................................................................................7-3
7.3 FAULT
CONDITIONS.........................................................................................................................................7-4
7.3.1 Abnormal End of Exposure .............................................................................................................................7-4
7.3.2 Operator End of Exposure ...............................................................................................................................7-4
7.3.3 Alarms...................................................................................................................................................................7-5
7.4 OPERATOR
MESSAGES.....................................................................................................................................7-5
7.4.1 Informative Messages.........................................................................................................................................7-5
7.4.2 Inverter Problem Message / Power Reduction Mode..................................................................................7-6
7.4.3 Messages and Meanings .....................................................................................................................................7-7
7.5 DIAGNOSTIC
FEATURES.............................................................................................................................. 7-13
7.5.1 Power On Self-Test ......................................................................................................................................... 7-13
7.5.2 Operator Console’s Service Mode ................................................................................................................ 7-13
7.5.2.1 Invoking the System Monitor in Console’s Service Mode............................................................... 7-14
7.5.2.2 Anode
Monitoring.................................................................................................................................. 7-15
7.5.2.3 IGBT
Code.............................................................................................................................................. 7-15
Resetting the Generator/Basket Status ........................................................................................................ 7-15
