Blue Correction - Zeiss humphrey HFA II-i series Field Service Manual

Adjustment / Calibration
3) After 7 – 10 minutes the unit beeps to indicate the calibration is completed.
Select STORE, then DONE.
If the instrument is equipped with the Blue-Yellow option, proceed to Section 4.8.3.4,
C

Blue Correction.

If the instrument is NOT equipped the Blue-Yellow option, go to Section 4.8.1 and
C
verify the after intensity values.
4.8.3.4

Blue Correction

Purpose
This procedure ensures that the wedges are properly calibrated for attenuation of the blue
stimulus light. Blue Correction calibration must be performed whenever blue projector
intensity calibration has been performed or the Wedge calibration has been performed.
During the Blue Correction calibration procedure, the blue filter on the color wheel is
rotated into the light path such that a blue stimulus is reflected into thee detector via the
mirror instead of being projected into the bowl. Each step position on the glass wedge and
the film wedge is measured by the spot detector, compared to the white light calibration
table and a resulting blue stimulus correction table is stored on the hard drive and calibration
floppy diskette.
Special Tools/Equipment Required
Tool Stand
P
Mirror Tool
P
Hand-Held Mirror
P
Bowl Shroud
P
Prerequisites
Before performing Blue Correction, verify the following:
Projection lamp filament voltage with lamp on. If voltage is over 10 volts, replace
P
lamp.
Projector Adjustment (Section 4.8.2.1)
P
Shutter Calibration (Section 4.8.2.2)
P
Aperture Calibration (Section 4.8.2.3)
P
Color Wheel Calibration (Section 4.8.2.4)
P
Focus Calibration (Section 4.8.2.7)
P
White Projector Intensity Calibration (Section 4.8.3.1.1) (Required only if the
P
Projector Lamp position was adjusted.)
Blue Projector Intensity Calibration (Section 4.8.3.1.2)
P
Field Service Guide
Humphrey Field Analyzer II - i
Confidential and Proprietary
4 - 26 52235C1105