Zeiss humphrey HFA II-i series, Field Service Manual

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Appendix H Humphrey Field Analyzer II - i
Confidential and Proprietary
Field Service Guide
H - 2 52235C1105
NOTE: The Blue projector voltage drop will display a value greater than zero
only
when
the printout is obtained immediately
after
performing the light intensity
calibration/verification.
4 = Camera/Gaze Data
Illumination:
Reflex LED . . . . . . . . . . intensity of the reflex LED
Left LED . . . . . . . . . . . . intensity of the left trial lens LED
Right LED . . . . . . . . . . . intensity of the right trial lens LED
Gain No Trial Lens . . . . . camera gain with trial lens holder down
Gain Trial Lens . . . . . . . camera gain with trial lens holder up
Scale . . . . . . . . . . . . . . . (not currently used)
Video Window:
Source X . . . . . . . . . . . . where the video image will be positioned on the CRT
(inside the video insert)
Source Y . . . . . . . . . . . . where the video image will be positioned on the CRT
(inside the video insert)
Dest X . . . . . . . . . . . . . . where the video insert will be positioned on the CRT
screen
Dest Y . . . . . . . . . . . . . . where the video insert will be positioned on the CRT
screen
Width . . . . . . . . . . . . . . . represents the width of the video insert
Height . . . . . . . . . . . . . . represents the height of the video insert
Gaze Window:
X . . . . . . . . . . . . . . . . . . represents the distance from the left edge of the video
insert to the left edge of the gaze box
Y . . . . . . . . . . . . . . . . . . represents the distance from the top edge of the video
insert to the top edge of the gaze box
Width . . . . . . . . . . . . . . . represents the width of the gaze box
Height . . . . . . . . . . . . . . represents the height of the gaze box
Gaze Size:
Height . . . . . . . . . . . . . . conversion factor for converting pixels to millimeters
Width . . . . . . . . . . . . . . . conversion factor for converting pixels to millimeters
Aspect Ratio . . . . . . . . . . normalizing factor to produce a true circle from the
data received from the camera
5 = Blue Correction Table.
The Blue Correction Table contains twelve correction values for both the Film wedge
and the Glass wedge . The Blue Correction table for the Film wedge should start at
zero and typically increase to around the mid to high 20's, and sometimes into the
30's The Blue Correction table for the
Glass wedge should also start at zero, and
display negative numbers going to –20 or –30 (in the middle of the table).
The values given above are to be used as a general guideline. The final evaluation
for Blue Calibration depends on the light intensity worksheet results.