P/N 9-500-0255 iii
Service Manual
Chapter 4: Calibrations and Performance Checks ..............................................4-1
1.0 Introduction ........................................................................................................................... 4-1
2.0 Calibration Procedures ........................................................................................................... 4-1
2.1 Entering Calibration Mode ............................................................................................... 4-2
3.0 Compression System Calibration Procedures .......................................................................... 4-7
3.1 Compression Force Calibration ........................................................................................ 4-7
3.2 Compression Thickness Calibration ................................................................................. 4-8
4.0 Exposure System Calibration .................................................................................................. 4-9
4.1 Tube Voltage Calibration ................................................................................................. 4-9
4.2 Check mA Calibration ................................................................................................... 4-11
4.3 Filament Current (mA) Calibration ................................................................................. 4-11
4.4 Backup Timer Test ......................................................................................................... 4-15
5.0 Automatic Exposure Control System Calibration .................................................................. 4-16
5.1 AEC Detector Gain Calibration ...................................................................................... 4-17
5.2 AEC Detect Board—R1 Adjustment ............................................................................... 4-18
5.3 Initial Calibration—Large Focal Spot (Mo) ..................................................................... 4-18
5.4 kV Tracking—Large Focal Spot (Mo) .............................................................................. 4-19
5.5 Initial Calibration—Large Focal Spot (Rh) ...................................................................... 4-20
5.6 kV Tracking—Large Focal Spot (Rh) ............................................................................... 4-21
5.7 Starting AEC Values—Large Focal Spot .......................................................................... 4-21
5.8 Performance Test—Large Focal Spot (Mo) ..................................................................... 4-21
5.9 Performance Test—Large Focal Spot (Rh) ...................................................................... 4-22
5.10 Initial Calibration—Small Focal Spot (Mo) ................................................................... 4-23
5.11 kV Tracking - Small Focal Spot (Mo) ............................................................................ 4-24
5.12 Initial Calibration—Small Focal Spot (Rh) .................................................................... 4-24
5.13 Starting AEC Values - Small Focal Spot ........................................................................ 4-25
5.14 Performance Test - Small Spot (Mo) ............................................................................. 4-25
5.15 Performance Test - Small Spot (Rh) .............................................................................. 4-26
5.16 HTC Factor (Offset) Calibration ................................................................................... 4-27
5.17 Large Bucky (24 x 30 cm) Factor Calibration ............................................................... 4-27
5.18 Compression Thickness Threshold Adjustment ............................................................ 4-28
5.19 C-arm Safety Function Check ...................................................................................... 4-31
6.0 Performance Checks ............................................................................................................ 4-32
6.1 Half-Value Layer ...........................................................................................................4-32
6.2 Reproducibility and Linearity in Manual Mode .............................................................. 4-35
6.3 Reproducibility in Auto-Time Mode .............................................................................. 4-36
6.4 Reproducibility in Auto-kV Mode .................................................................................. 4-36
6.5 Reproducibility in Auto-Filter Mode .............................................................................. 4-36
6.6 Bucky Device Performance Check ................................................................................. 4-40
6.7 AEC Limits Performance Check ..................................................................................... 4-40
6.8 System Level Functional Check ..................................................................................... 4-41
6.9 Optical Density (Users Preference) Verification ............................................................. 4-41
6.10 IRSD Leakage Check ................................................................................................... 4-41
6.11 X-ray Tubehead Leakage Check ................................................................................... 4-42
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