Signal Corrections Before And During Scan - AGFA CR 30-X Service Manual

DD+DIS150.06E
5.3
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Edition 1, Revision 0
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Signal at pin diodes during bootup
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Signal at BOL/EOL sensors during scan
Note: Timings are unproportional distorted to show correlation between different signals

Signal Corrections before and during Scan

Introduction:
To compensate PMT sensitivity irregularities due to the previously collected
light, the light collector has a blue LED built in.
This blue LED creates a reference signals (REF LUM) before and during scan,
to correct the sensitivity of the PMT "on the fly" (HT correction).
Calibration of the "PMT - Light Collector System" at Production:
STEP 1: Adjusting blue LED
The blue LED is adjusted by the PMT electronics at initialization of the system
this way, that a defined output signal (LPV = Linear Pixel Value) is reached.
The voltage at the blue LED to reach the value is stored in the PMT EEPROM
as REF LUM value.
Parameters of REF LUM: Variations of LEDs; LED mounting position.
DOCUMENT CONTROL NOTE:
Type 5175/100
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Laser on/off during scan
AD Window
IP Width
Figure 8
CR30-X
Functional Description
517502ac.cdr
Agfa Company Confidential
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Chapter 2 / 9