HF Series Generators
Calibration
CA-1036R2
16
2.5 DIGITAL mA LOOP OPEN (X-RAY TUBE CALIBRATION)
To achieve the most accurate calibration, this procedure has to be
automatically performed by the Generator (Auto-calibration). Calibration
procedure w ill be manually performed by the field engineer only if
Auto-calibration is not possible.
Two different methods are described in this section: Auto-calibration and
Manual Calibration.
Digital mA Loop Open is calibrated by performing the following steps:
1. With the Generator power OFF, set:
G Dip switch 3000SW2-2 on the HT Controller Board in “Off” position
(enables Filament and Rotor Interlocks).
G Dip switch 3000SW2-4 on the HT C ontroller Board in “On” position
(Digital mA Loop Open / Filament Current Constant).
2. Turn the Generator ON.
3. Perform the Auto-calibration procedure as described in Section 2.5.1 for
each X-ray Tube in the system.
2.5.1 AUTO-CALIBRATION OF DIGITAL mA LOOP OPEN
Auto-calibration of the Filament Current Numbers is divided in two separated
procedures related to the mA stations configured for the Small or Large Focal
Spots.
It is recommended to start with the Small Focal Spot (first group) and continue
with the Large Focal Spot (second group).
EACH TIME THAT AUTO-CALIBRATION IS ACTIVATED IN A
mA STATION (OR IN “E01” MEMORY LOCATION), ALL THE
FILAMENT CURRENT NUMBERS OF THE SELECTED FOCAL
SPOT ARE AUTOMATICALLY SET TO “344”. SO A NEW
COMPLETE CALIBRATION OF THE FILAMENT CURRENT
NUMBERS FOR THIS FOCAL SPOT WILL BE REQUIRED.
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