mA Generation
The Generator Driver PCB monitors both the filament voltage and filament current from voltages present on the Filament Driver
PCB. The. filament selection relay generates another signal to the Generator Driver PCB to control the gain of the measurement
circuits, because the two filament transformer ratios are different.
The actual filament voltage and current measurements are relayed through the Generator Driver PCB to the X-Ray Controller
PCB from the tank. There analog voltages are converted to digital and fed to the microprocessor for control of the Filament
Driver PCB.
Functional Tests
X-ray Tube
None—Refer to the Fault Isolation chart for the X-ray Tube, later in this chapter.
High Voltage Tank
If you suspect the tank may be faulty, make the tests detailed in the Fault Isolation section and check for internal arcing and
carbon trails in the connectors. Do not open up the tank.
mA Accuracy
Note: These tests can only be accomplished using a complete C-arm system with functional system software, as the image
chain must be operational.
1. Place lead sheet over the Image Intensifier.
2. Using techniques from 40kVp at 0.2mA up to 100kVp at 40mA, in suitable increments, verify that mA is within C-Arm
requirements for this range. Refer to the Calibration chapter of this manual for details.
3. Using high mA pulsed techniques from 40kVp at 20mA to 120kVp at 125mA, in suitable increments, verify that mA
accuracy is within ±10%. Refer to the Calibration chapter of this manual for details.
4
Service
Periodic Maintenance
Contents
Schematics
Illustrated Parts
Installation
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