DeWalt DW9116 Manual do Operador descarregar pdf (Página 7)

4.0 DESCRIPTION OF OPERATION

The block diagram below illustrates how the XRS-4 functions. The following sequence of events

takes place each time the XRS-4 is fired:

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 18 volts DC to 22Khz AC.

4. The transformer charges the High Voltage Capacitor to about 9000 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 270,000 volts and

50 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 XRS-4 cannot

produce x-rays without the pulsing sound so it serves as an additional warning the XRS-4 is

functioning.

This unit generates x-rays through high voltage bombardment of a tungsten target. The XRS-4 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

CONTROLLER

USER

INTERFACE

CONVERTER

HIGH VOLTAGE

CAPACITOR

SPARK

GAP

X-RAY

TUBE

BATTERY

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DeWalt DW9116 Manual do Operador Página 7