PXS-710D Section 5
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THEORY OF OPERATION
4.1 SOURCE OVERVIEW
The Model PXS-710D incorporates one major electrical assembly, the
Control/Generator Assembly. The Control/Generator Assy. consists of five sub-
assemblies. The generator assembly houses the high voltage circuitry and the x-
ray tube, high frequency generating circuitry, control electronics, microprocessor
and a collimator (beam limiting device) assembly.
The PXS-710D also can be controlled via a RS-232 Serial link, the RS-232 Serial
link allows a 3
rd
party computer application, OpalRad (Supplied by the End User),
to communicate with the generator.
4.2 GENERATOR/CONTROL ASSEMBLY
The Generator Assembly is made up of High Voltage multipliers for the anode
and cathode supplies, voltage feedback dividers, high voltage transformers and
the filament transformer. For the Low Voltage section a Control Microprocessor
PWA, Power Board PWA and the 24V power Supply are used.
The voltage used to generate the high voltage enters the assembly at pins 1 & 7
of connector P1. The voltage is approximately 650 VPP at an approximate 30
kHz square wave, for a 70-kVp output.
The filament voltage enters at pins 2, 4 & 6 of connector P1. Pin 4 is at a DC
level of approximately 24V, and pins 2 & 6 have a high frequency voltage of
about 48 VPP at approximately 50 KHz with respect to ground. Pin 3 & 5 of P1
are ground connections.
Pin 9 of P1 is the kV feedback signal (10 V=100kV). Pin 10 of P1 is the cathode
low-end signal (10V = 10mA). Pins 11 of P1 provides the anode low-end
signal, which goes to the mA test jack.
Connector J3 (mA test jack) places a mA meter in series with the mA line for
calibration purposes (Ref. Section 2.3).
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