EPS 45-80 High-Voltage Generator
4-18
Technical Manual P/N 9894.00.G6
Boost Time & Brake Time
Recommended values for high speed boost/brake are given for
indication only (gray figures) and can be modified if desired (
500 -
15000 ms)
. Low speed boost time is about ¾ times the High Speed
boost time value.
Figure 4.11
–
Epsilon X-ray Tube Setup Module.
4.4.2
X-ray Tube Derating
The tube derating feature :
•
Shall be done on an X-ray tube that is already configured as per § 4.4.1 only.
•
Shall always be followed by a tube calibration (Section 5.2).
A tube can be derated to extend its usable lifetime, to troubleshoot specific conditions or other
reasons. Derating any of the X-ray tube factors necessarily limits the generator’s X-ray factors and
therefore might reduce the exposure techniques kW. For example, if the filament current value of
the small filament is derated to 3.5 A and the requested tube mA requires a filament heating higher
than this value, the generator might either switch to the large filament (autofocal spot mode) or, else,
it will refuse the current technique by displaying the following operator message: “Tube Fil Limit”.
