Radiographic Parameter Limits
Switching between small focus and large focus may have a delay of a few
seconds to enable the filament to warm up before switching.
The settings of kV and mAs or of mA and ms are defined by an algorithm. The
highest mA setting is used for which the kV can be reached by the system and
the exposure time is not lower than 1 ms or the mAs value is not lower than
0.5 mAs. When the kV setting is changed, the value of mA and ms are adjusted
automatically to keep the mAs value constant, within the boundaries of
generator or X-ray tube limitations.
If the radiographic parameters limits are reached, a value of a radiographic
parameter cannot be increased or decreased, or another value can be
automatically adjusted:
• Radiographic Parameters Limit. A maximum or minimum radiographic
parameter limit is reached. The value cannot be increased or decreased.
• Generator Power Limit. The generator power limit (kV x mA) is reached.
The value of the selected parameter cannot be increased. When increasing
the value of the other parameter, the value of the first parameter will
automatically be decreased to keep the mAs value constant.
• Space Charge. The space charge limit in the selected X-ray tube is reached
by changing the kV or mA values. An information message is displayed.
• Instantaneous Power. The instantaneous power limit of the X-ray tube
(ratings limit or the X-ray tube is momentarily overheated) is reached by
selecting some technique. An information message is displayed.
264 | DR 600 | Problem solving
3261K EN 20210708 0808
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