By E. Forster (auth.)
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Additional resources for Equipment for Diagnostic Radiography
Sample text
This should demonstrate that the meter circuit has no direct influence on the voltage applied to the primary winding of the high tension transformer. This can only be influenced by selecting a greater or lesser number of turns from the autotransformer. 38 kV compensation circuit It will be noted that once again there is a selector which is ganged to the rnA control. This time, however, there are no counterwound turns. The operation of the circuit is simple in that increase in rnA (which would lead to reduction in the kV applied to the tube) automatically increases the number of turns tapped from the autotransformer whilst a reduction in rnA reduces the number of tapped turns.
Thus if all rnA values are less than they should be, as occurs for instance when the filament wears thin due to age and consequently has increased resistance, the trimmer resistance can be reduced, restoring all rnA s to their original value. FILAMENT STEP-DOWN TRANSFORMER The next t:omponent is the hlament step-down transformer. This consists of two primary and two secondary windings, one for the broad focus and one for the fine focus. The filament supply voltage may be applied to either of the primary windings.
1) more X-rays, (2) More X-rays are produced for a given rnA and kVp. (2) X-rays of shorter average wavelength than the singlephase unit, even though kVp and rnA are the same in each case. g. radiographic exposure, can be achieved in a shorter time. Therefore reduction in exposure times is achieved. (4) Improved tube rating is achieved at short exposure times (this will be discussed later in 'tube rating'). (5) The X-ray tube has a longer life due to more even thermal loading. 25 Useful radiation produced by 2 pulse and 6 pulse generators This is due to the rectified three-phase voltage (and current) being closer to a constant value than single-phase voltage (and current) which is pulsating.