MOBILETT Plus/ Plus E Register 6 SPR8-215.850.02 Page 2 of 4 Siemens-Elema AB
Rev. 01 01.02 SPS-UD Solna, Sweden
16 - 2 Integration of the tube current
The selected mAs value is reached, as soon as the counter has been reduced to zero.
The two control frequencies at test points ”INV A” and ”INV B” on board D13 are then dis-
abled.
This switches off the high-voltage inverter.
The following further actions are then initiated:
• the yellow exposure-indicator lamp is turned off,
• the buzzer on board D3 produces a relatively long beep tone,
• the rotating anode is braked for about 9
1
seconds, and
• the green ”ready” LED on the Control and display panel is turned off.
When the anode plate comes to rest, the capacitor bank, M1, is charged again.
When the signal ” CAP VOL” has reached its kV- dependent final value, the green ”ready”
LED is turned on. The unit is ready to make new exposures.
The following oscillogram shows, as an example:
CH 1 = ” HT PEAK” at 60 kV
CH 2 = ” MA POS ” at 100 mAs
Fig. 3
Here, only the ”envelope” of ”MA POS” is important, since measurement with a
digital oscilloscope, due to the ”sample rate” of the oscilloscope, can distort the
individual pulse forms shown in the display (aliasing effect)!
See the Service Instructions for additional information!
1. 7s if FW version lower than V.1.4 or V.1.4E.
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