A-8 P/N 9-500-0255
Service Manual
Appendix A: Specifications
System Specifications
Light Field Illuminance The light localizer has a minimum illuminance
of 160 lux and meets all of the requirements of
21CFR, section 1020.31. The lamp voltage is
the least amount required to assure 160 lux at
low line. A shatter shield surrounds the lamp.
Lamp is service adjustable to provide align-
ment of the light field to the x-ray field.
Light Field Mirror The light field mirror is motor driven out of the
x-ray field within 1.0 sec of x-ray initiation sig-
nal. Position sensors provide for x-ray inter-
lock. The lamp position is adjustable between
large focal spot and small focal spot to provide
proper light field to x-ray field congruency
required for a bi-angle target x-ray tube.
1.13 High Voltage Generator Specification (in compliance with IEC 601-2-
7)
Output Rating 3.2 kilowatt isowatt, minimum (100 mA @ 32
kV) at all loading times
Ripple Typically no greater than 2% with a maximum
of 4% at lower output loads (less than 2.2 kW)
and at high and low line voltages.
Topology Pulse-width-modulated High Frequency, active
servo-controlled. Dual Use of Inverter for HV
generation and for Rotor Supply
Timer An interval timer is used for the manual timing
as well as for the back-up-timer. There is an
additional hardware safety timer used to limit
the maximum exposure time to 6.5 seconds.
Manual mAs Range Small Focus: 3 through 150 mAs in 41 incre-
ments. 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18,
20, 22, 24, 26, 28, 30, 32.5, 35, 37.5, 40,
42.5, 45, 47.5, 50, 55, 60, 65, 70, 75, 80, 85,
90, 95, 100, 110, 120, 130, 140, and 150
mAs.
Large Focus: 3 through 500 mAs in 59 incre-
ments. 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18,
20, 22, 24, 26, 28, 30, 32.5, 35, 37.5, 40,
42.5, 45, 47.5, 50, 55, 60, 65, 70, 75, 80, 85,
90, 95, 100, 110, 120, 130, 140, 150, 160,
170, 180, 190, 200, 220, 240, 260, 280, 300,
325, 350, 375, and 400, 425, 450, 475, and
500 mAs.
Reproducibility 0.05 coefficient of variation for 10 consecutive
exposures, per 21CFR, 1020.31. Internal limit
= 0.04.
Linearity Radiation output versus selected mAs is less
than 0.10 for adjacent mAs selections as fol-
lows: (X1-X2) equal to less than 0.10 (X1 + X2)
where X1 and X2 are average mR/mAs values
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