Humphrey Field Analyzer II - i
Adjustment / Calibration
Confidential and Proprietary
52235C1105
4 - 17
Field Service Guide
NOTE:
If you first rotate the glass wedge to partially dim the projected spot, you may find it
easier to discern the point of sharpest focus.
3)
Use the UPPER CALIBRATION/LOWER CALIBRATION to verify focus in other than
central positions. (Use this opportunity to check for "halo" around the spot — a sure
sign of dirty optics.)
4.8.2.8
Detector
Purpose
Normally, detector position check/adjustment is required any time you have removed or
replaced the detector PCB assembly, the detector housing, or the turret lower lens assembly.
Detector position is adjusted to assure that the maximum amount of light will be sensed by
the detector. The alignment of the detector is critical. The
HFA II - i
uses only one detector
to determine both spot and bowl intensity.
Special Tools/Equipment Required
P
Brightness Detector Alignment Target
Procedure
1)
Remove the Brightness Detector PCB (3.29).
2)
While holding a clean lens tissue below the opening in the detector housing, tip the
housing upward and tap it lightly so that the filter, glass window, and wavy washer
drop out of the detector housing onto the tissue (Figure 4-6).
3)
Insert the brightness detector alignment target into the detector housing. Ensure that it
is properly seated.
4)
From the Mechanical Calibration menu, select
DETECTOR.
Work carefully during the next steps to avoid accidently moving the turret. If the turret is
accidently moved, select RESET to reinitialize the detector position.
5)
With the room lights on, look into the alignment target and verify that the image of the
projected spot falls within the inner box on the target (ideally, at the cross hairs).
6)
If required, slightly loosen the screws that hold the detector housing to the turret
assembly, and adjust as necessary.
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