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118157-001 Rev C
X-Ray Tube Filament Calibration:
The X-ray tube filament current is required to be calibrated once the initial installation is completed
or if the X-ray tube was replaced. The calibration is required for both the large and small filaments. If
the tube only has one filament, only the large filament will require calibration. The tube
manufacturer will recommend the maximum setting for each filament. In most cases, the filament
current supplied will be DC unless the user has specified an AC filament source when procuring the
XRV Generator. If an AC filament source was selected, then an appropriate meter having an
adequate frequency response of 25kHz or more should be used to measure the RMS current.
Current measurements are made directly in the high voltage cable that is connected to the X-ray
tube. Refer to the current limit data for small and large found in the Tube Specification Data Sheet.
The filament measuring and calibration adapter is available as an accessory kit from Spellman High
Voltage.
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