X-Ray Source Unit; Data Acquisition System - Hologic QDR 4500 Technical Manual

X-RAY SOURCE UNIT

The X-Ray Source (commonly referred to as the Tank assembly) consists of the X-Ray tube, the
X-Ray tube filament transformer, the high voltage transformer, the high voltage rectifier circuit,
and the sensing circuits that monitor the high voltage applied to the X-ray tube and the beam
current.
Table 2-20 describes the interconnections between the X-Ray Controller Assembly and the X-
Ray Source unit. The table also identifies the X-Ray Controller Assembly board, connector and
pin assignments for each interconnection signal.
Table 2-20. X-Ray Controller Assembly/X-Ray Source Unit Interface
Signal
HV_XFMR_PRI+ High Voltage Transformer
HV_XFMR_PRI- Primary
FIL_XFMR_A Filament Transformer
FIL_XFMR_B Primary
IF+ Beam Current Sense "+"
IF- Beam Current Sense "-"
(Chassis)
TP1 Anode pulse monitor
TP2 Cathode pulse monitor
* A thermal overload protector is installed in series with the filament transformer primary
winding, between TB1-6 and TB1-8.

DATA ACQUISITION SYSTEM

The QDR 4500 Data Acquisition System (DAS) consists of three Solid State Detector printed
circuit boards, an Integrator/Multiplexor board, and an Analog To Digital Converter (ADC)
board. The Solid State Detector boards and the Integrator/Multiplexor board are physically
located within the upper end of the C-arm. The detector boards mount under the
Integrator/Multiplexor board and connect to the Integrator/Multiplexor board. The
Integrator/Multiplexor board is contained in an electrically shielded enclosure. There is also a
lead radiation shield between the detector and the integrator/multiplexor boards to stop any X-
rays that might get through the detectors. The ADC board is located within the rear downward
slope of the C-arm.
2-26
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QDR 4500 Technical Manual
Description
(JP1)
I/O & Logic
(JP6)
I/O & Logic
(JP6)
I/O & Logic
(JP6)
I/O & Logic
(JP6)
I/O & Logic
(JP6)
XRC Board Controller
Pin
H-Bridge JP1-1, JP1-2
JP1-3, JP1-4
JP2-7
JP2-8
JP2-4
JP2-5
JP2-2
JP2-1
Tank
Terminal
TB1-3
TB1-4
TB1-6*
TB1-9
TB1-10
TB1-7
TB1-12
TB1-11