Zeiss humphrey HFA II-i series, Field Service Manual

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Humphrey Field Analyzer II - i Adjustment / Calibration
Confidential and Proprietary
52235C1105 4 - 47
Field Service Guide
2) From the Calibration Main Menu, select Camera , Position .
3) Install the Tool Stand with Fake Eye in the same manner as for camera intensity Cal.
4) Center the Fake Eye to the cross in the video insert.
5) Slightly loosen the two lower screws on the camera mount, you still want some pressure
against the Reflex LED holder.
6) Move the Reflex LED using the Reflex LED holder until you center the circular LED
pattern on the Fake Eye.
7) Tighten the screws of the camera mount and recheck to see if the adjustment was
successful.
Bowl IR LED Assembly Alignment
Note ­
After replacement or adjustment of the IR LED assembly, camera intensity
calibration must be performed.
1) Dim the room lights and turn down the brightness on the CRT (this greatly improves
your ability to distinguish small differences in illumination in the CRT image).
2) From the Calibration Main Menu, select
Camera
,
Position
.
3) Install the Tool Stand with Fake Eye in the same manner as for camera intensity Cal.
4) Center the Fake Eye to the cross in the video insert.
5) Slightly loosen the screws holding the IR LED clamps.
6) Cover the cold mirror on the opposite side of the bowl with a small sticky note. Be
careful that you do not touch the surface of the cold mirror.
7) Using the knurled portion of the IR LED assembly, adjust IR LED until you have the
brightest image on the camera display. You will see four shadow spots in a diamond
pattern from the IR LED assembly. You may not see all four spots on the display at one
time. If possible, make sure that none of the spots are in the gaze box.
8) Tighten the IR LED clamps and recheck the camera image.
9) Repeat the procedure for the IR LED assembly on the opposite side of the bowl (as
required).