51
PMT gain and ADC offset verification/adjustment
Whenever parts that have influence on the gain and offset are replaced it is important to verify, and if
necessary adjust the PMT gain and ADC offset to ensure that the image quality is not lowered.
To properly verify the PMT gain and ADC offset you will need the following items;
QuantorDent(Vet) or similar acquisition software installed on a PC.
Size 4C dental IP.
Dosimeter to measure absolute dose.
X-ray generator.
ADC offset verification and adjustment
1.
Connect the unit to both a PC and power outlet.
2.
Switch the unit on.
3.
Enter the
calibration menu
as described in the user manual for your software.
4.
For Quantor users use the options icon (
1
) in the top right hand corner and select “
Device
calibration
” (
2
).
5.
Position the size 4C IP on the tray and close it to erase the IP.
6.
Remove the IP from the tray and reposition it on the tray.
7.
Scan the IP using the blank calibration position.
8.
Compare the readout value to the tolerance for the blank calibration.
1
2
Blank scan tolerance.
Blank scan
readout value.
Summary of Contents for Fire CR dental
Page 1: ...Service Manual Hardware revisions AH and later ...
Page 2: ...1 ...
Page 9: ...8 8 Set the reader back upright and carefully lift the top cover off ...
Page 10: ...9 9 Remove the 4 screws fastening the inner chassis using a 2 5 mm hex key and lift it off ...
Page 19: ...18 13 Replace the optics bracket and install in reverse order 1 2 ...
Page 39: ...38 7 Replace the bottom board and install in reverse order ...
Page 63: ...62 ...
