Radio Science - Exam 3 Review Flashcards
Typical incoming voltage to high voltage circuit
220 V
Autotransformer
Makes adjustment to voltage before it’s stepped up
Location of Autotransformer
Low-voltage side of High Voltage Circuit for safety
Exposure switch/timer
Initiates exposure & terminates it in 1 of 3 ways
3 ways exposure switch/timer
- Manual timer
- mAs timer
- Automatic Exposure Control AEC
Step-up transformer turns ratio range
500:1 to 1000:1
Rectification bridge
-Diode that changes AC to DC
-When electrons approach n side, the electrons are repelled toward bridge
-Positive charge on p side repels its holes toward bridge
-At bridge, current can flow
2 components of X-ray tube
Cathode
Anode
Cathode
Negative side of X-ray tube
Thermionic emission
Anode
Positive side of X-ray tube
X-ray production
Rotor switch
Begins anode spin - 3400 rpm
Heats up filament within X-ray tube
Thermionic emission
Boiling off electrons from filament due to high amperage & high resistance
mA selection
Resistors
Step-down transformer
Ratio of 1:44
mA increased by factor of 44, up to 5 amps
Half-wave rectified & self-rectified circuits
60 pulses/sec
100% voltage ripple
30% average kVp
Single-phase, Full-wave rectified
120 pulses/sec
100% voltage ripple
30% average kVp
3-phase, 6-pulse generator
360 pulses/sec
14% voltage ripple
91% average kVp