6
4.0 DESCRIPTION OF OPERATION
The block diagram below illustrates how the XR150 functions. The following sequence of events
takes place each time the XR150 is fi red:
1. User initiates operation of the machine.
2. The control section sends a signal to the converter section to begin oscillating.
3. Once oscillating, the converter section changes the 12 volts DC to 22Khz AC.
4. The transformer charges the High Voltage Capacitor to about 8000 volts.
5. The spark gap arcs after the High Voltage Capacitor reaches proper voltage.
6. The pulse detector signals the control block that the unit has pulsed.
7. As the High Voltage Switch is closed, a high voltage transient of approximately 150,000 volts
and 30 nanoseconds in duration is applied across the x-ray tube generating x-rays.
The closing of the High Voltage Switch produces an audible pulsing sound.
The XR150 cannot
produce x-rays without the pulsing sound so it serves as an additional warning the XR150 is
functioning.
This unit generates x-rays through high voltage bombardment of a tungsten target.
The XR150 does
not contain radioactive materials
.
All the high voltage is contained within the aluminum canister
and as long as the canister is not punctured the operator is not exposed to dangerous voltages.
BLOCK DIAGRAM
PULSE DETECTOR
USER INTERFACE
X-RAY TUBE
HIGH VOLTAGE
CAPACITOR
CONVERTER
BATTERY
SPARK GAP
CONTROLLER
