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CPI Canada Inc.
AEC Calibration
3D
Use and disclosure is subject to the restrictions on the title page of this CPI document.
CMP 200
®
Service Manual Ch # 901476-05 Rev. A
Page 3D-28
3D.5.0 AEC DENSITY CALIBRATION (Cont)
Refer to table 3D-10 for two typical examples of density steps vs. calibration numbers. For 8 minus density steps the mAs decrease is 6.25%
per step, and for 8 + density steps the mAs increase is 12.5% per step as per the example calculation above.
For 5 minus density steps the mAs decrease is 10% per step, and for 5 + density steps the mAs increase is 20% per step.
DENSITY
STEP
CALIBRATION NUMBER (- 8
DENSITY = HALF THE DOSE, +8
DENSITY = DOUBLE THE DOSE)
DENSITY
STEP
CALIBRATION NUMBER (- 5
DENSITY = HALF THE DOSE, +5
DENSITY = DOUBLE THE DOSE)
-8 50
-7 44
-6 38
-5 31
-5 50
-4 25
-4 40
-3 19
-3 30
-2 13
-2 20
-1 6
-1 10
0 DENSITY: SHOWN FOR REFERENCE ONLY.
+1 13
+1 20
+2 25
+2 40
+3 38
+3 60
+4 50
+4 80
+5 63
+5 99
+6 75
+7 88
+8 99
Table 3D-10: Example density values