By E. Forster (auth.)
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Additional resources for Equipment for Diagnostic Radiography
C. winding). The electronic voltage stabilizer is not frequency dependent. The space charge compensator compensates for the effects of space charge. Space charge is the collection of electrons around the filament and is greatest when there is no kV across the tube. As the voltage across the tube increases space charge decreases and maximum current (rnA) flows when the kV is sufficiently high to pull all the electrons across to the anode as fast as they are emitted by the filament. This is called saturation current.
R1-R6. This is normally done by the Engineer. 40). 39 rnA selector circuit TRIMMER RESISTANCE This a variable resistor which is used to alter the value of all rnA readings. 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.
If, for example, Z is negative and X positive current can only flow through rectifier 2 to the X-ray tube then back to X via rectifier 4. By the same token if Y is negative with respect to Z current will flow through rectifier 1 through the X-ray tube and back to Z via rectifier 5. The current through the X-ray tube is always from filament to anode. Some three phase circuits; particularly those to be used for techniques such as cine fluorography, where short exposures and fast repetition rates are needed, use capacitors and vacuum triodes to provide constant potential and secondary switching.
Equipment for Diagnostic Radiography by E. Forster (auth.)