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Siemens-Elema AB Register 6 SPR8-215.850.02 Page 1 of 4 MOBILETT Plus/ Plus E
Solna, Sweden Rev. 01 01.02 SPS-UD
Integration of the tube current 16
The block diagrams and the wiring diagram X037E, sheet 140 are the basis for the func-
tional description given below.
The actual tube current is led via a measuring resistor in the single tank and cable K9 to
the CPU board D1.
Fig. 1
There it can be measured at test point ”MA POS”.
Before the exposure release the selected mAs value is stored as binary information in a
software-implemented counter.
Beginning 0.7 ms after the start of exposure the actual tube current ”MA POS” is mea-
sured every 50 µs by the microprocessor 80C166 on the CPU board D1 until the exposure
is completed.
The result of the measurement is used to decrease the counter.
Simultaneously, each measured actual tube current value is compared with a
minimum value of 5 mA.
Fig. 2
"MA POS" curve for a long-time exposure
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