3. Interfacing
Technical Manual P/N 9894.00.G6
3-25
3.4.4
AEC/Fluoro Lock Mode Input Type
This active low signal works in AEC serial technique and in Fluoro.
In
AEC
serial exposure (RAD), the first frame is done using the AEC feedback. The Lock input is
sampled at the end of each exposure:
•
If false, the next exposure is performed in AEC mode;
•
If true, the next exposure is performed at the latest measured mAs parameters.
In automatic
Fluoro
(ABS), kV/mA corrections are considered after each exposure pulse (Pulsed
Fluoro) or after every time interval (Continuous Fluoro). At each correction time, the following
conditions might produce one of the following actions.
1.
Lock Input is false
The generator clears the lock mode and corrections are made normally. The Fluoro High or
Low level pedals are scanned to determine the active Fluoro level.
2.
Lock Input is true, Lock mode not set yet
The generator will set the Lock mode (active) at the arrival of any of the following conditions,
inasmuch as the lock input remains true:
i)
No kV correction by the kV/mA correction algorithm for two consecutive pulses;
ii)
Occurrence of kV minimum or kV maximum;
iii)
Six consecutive calculations returning a kV change;
The Fluoro level (High or Low) is saved when the generator enters the Lock Mode. Therefore,
the pedals are ignored, until the next Fluoro run.
3.
Lock Input is true, Lock Mode already set
In lock mode no changes are made to kV, mA or mAs per pulse. Live pedal changes from/to
Fluoro High Level to/from Fluoro Low Level are ignored.
4.
Idle Mode
When the same Fluoro level is selected from Idle Mode that was just previously locked and the
Lock Input is still true, the generator continues with the same locked parameters. Selecting the
other Fluoro level starts the Fluoro sequence as in condition 2 above.
3.4.5
AEC Reset Input Type
A falling edge activation of this input will reset a backup time fault in AEC mode. It has no impact
at any other moment.
3.4.6
Fluoro Alarm Reset Input Type
A falling edge activation of this type of input during Fluoro will reset the Fluoro alarm. It has no
impact at any other moment.
