Fault Exposure Detection

AEC

Detailed explanation and sketches see Service manual Optimus (R/F, RAD, C); Tab 3; FAULT FINDING

 

      off        =       No 4% dose supervision at 10% of the backup exposure time, automatically off after APR overriding

 

      on        =       (default) At 10 % of the backup exposure time (APR mAs value) DRC detects if at least 4% of the expected dose (signal must be > 20mV) have been measured. If not, the exposure will be switched off by CU.

 

TDC    

Detailed explanation and sketches see Service manual Optimus (R/F, RAD, C); Tab 3; FAULT FINDING

 

      off        =       No 4% dose supervision at 10% of the backup exposure time, automatically off after APR overriding

 

      on        =       (default) At 10 % of the backup exposure time (APR mAs value, not before 250ms, tomo time > 1000ms) DRC detects if at least 4% of the expected dose (signal must be > 20mV) have been measured. If not, the exposure will be switched off by CU.

 

CONT

factors for continuous fluoroscopy can be modified:

 

          scantime_TV [ms]:         default     =        20 ms (must be 20 ms for 50 and 60 Hz)

                                               range      =        0 ... 60000 ms

 

          scantime_TV valid:        yes         =        default

                                               must be ‘yes’  without CAN driven R/F system controller

                                               no          =        only possible with a CAN driven R/F system controller

 

          P_max_EDL [W]:            default     =        250W

                                               range      =        0 ... 9000 W, max entrance dose limitation,

                                               active, if WB X12 pins 1-10 closed (SID < 100 cm)

                                               see Service manual Optimus (R/F, RAD, C); Tab 6; ADJUSTMENTS

 

          TV_pos_limit [V]:           default     =        6.885 V

                                               range      =        +3 ... +7.5 V                ADC input of TV chain

 

          TV_neg_limit [V]:           default     =        -6.885 V

                                               range      =        -7.5 ... -3 V                  ADC input of TV chain