Chapter 10: Image Acquisition
5495975-1EN Rev.9 10-25
© 2013-2017 General Electric Company. All rights reserved.
After the exposure has been completed, the console automatically displays the exposure time (mSec)
and mAs values (Figure 10-19).
Figure 10-19 Example AEC exposure completed (normal operation)
The Applications software sets two limits for AEC operation: 512 is the maximum mAs. 2 seconds (2000
milliseconds) is the maximum exposure time.
Note: When either one of the above limits is reached, the Applications software terminates the expo-
sure. For example, Equation 10-1 demonstrates that with a console selection of 250 mA, the sys-
tem reaches the 2000 millisecond maximum exposure limit before it would reach the 512 mAs
limit.
Equation 10-1 AEC exposure limit calculation
(the 250 mA console selection) X (2000 milliseconds) = 500 mAs
Note: The Applications software also uses a built-in formula to set limits for AEC operation in addition to
the two limits stated above. This formula limits mAs to a value less than 512 mAs and exposure
time to a value less than 2000 mSec, depending upon the technique selected. Due to these limita-
tions, you may reach an AEC limit even with a mAs value less than 512 mAs and with an exposure
time less than 2000 mSec. If either of these events occur, the Applications software terminates
the exposure.
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