PRS 500 B User Manual
5014-0-0002
PROTEC GmbH & Co. KG, In den Dorfwiesen 14, 71720 Oberstenfeld, Germany
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4.6.3
Dosimetric Calibration (only PROVARIO HF)
The Generator is running a self –test, at switching on and changing the tube in a two tube operation,
on the chosen area dose measuring chamber.
On this test every Vacutec area dose measuring chamber emits a determinated number of test pulses,
which are getting detected by the Generator, the Generator compares it with a deposited test value. At
a dev/- 2% the error E018 „DAP-System“ gets displayed on the control panel which indicates a
decalibrated measuring chamber.
The test value of the area dose measuring chamber, which can be found on the test protocol, has to be
applied to the parameter 846 of the Generator or via the Service program into the field “DAP test count
value x (120-300)” (1).
The current measured test value is displayed in the field “DAP measured value x”(2) after switching on
the Generator. For this the function “read from gen”(3) has to be executed. Modest differences in the
measures test value can be caused by air pressure fluctuations or wrong installed measure chambers.
This window can by opened in the Service program:
Menu -> Settings -> Setup kV Control…
Dosimetric Calibration Venus 50R
, detailed information please find in the enclosed documentation
of the generator.
4.7
Exposure automatic
If the PRS 500 B is operated with an exposure automatic the functionality can be checked like this:
Place a Phantom or any other weakening object in the radiation way. Choose a measuring chamber
and expose. If this happens properly the measured value will be displayed. If something is not running
properly an Error message will be shown. Repeat this procedure for every measuring chamber.
