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Humphrey Field Analyzer II - i
Adjustment / Calibration
Confidential and Proprietary
52235C1105
4 - 25
Field Service Guide
6)
Select
BOWL
, then
YELLOW
. Allow the yellow lamp to warm up for 3 minutes before
proceeding. Observe the DMM voltage reading for 15 seconds to see if the light output
from the yellow lamp has stabilized.
7)
Divide 29.87 by the P3Y factor on your light meter (or use P3 if your light meter does
not have a P3Y factor).
8)
Using the pads on the screen menu, increase or decrease background intensity until
your DMM reads closest to the result of the calculation done above. Try to set the
background intensity as close to 29.87 Ft-L as you can. (It must be between 28.53 –
31.28 Ft-L., otherwise the
after
evaluation of the yellow bowl lamp intensity will not be
within tolerance.)
9)
Select
CALCULATOR
, and enter the voltage reading displayed on your DMM via the
ten-key pad and select [Enter]. The voltage reading and the calculated foot-lamberts
will be displayed next to YELLOW. Also displayed is the tolerance for the bowl
intensity calibration. If an asterisk (*) appears, this indicates that the value is out of
tolerance.
10) Select
STORE
, then
DONE
.
4.8.3.3
Wedge
Purpose
This procedure ensures that both wedges are properly calibrated for attenuation of the white
stimulus light. Wedge calibration must be performed whenever white projector intensity
calibration has been performed.
During the Wedge Calibration procedure, the clear opening on the color wheel is rotated
into the light path such that a white stimulus is projected into the bowl. Each step position
on the glass wedge and the film wedge is measured by the spot detector, and a resulting
white stimulus table is stored on the hard drive and calibration floppy diskette.
NOTE:
If the Wedge calibration is performed and the instrument is also equipped with the
Blue-Yellow option, the Blue Correction calibration MUST be performed after performing the
Wedge Calibration.
Special Tools/Equipment Required
P
Bowl Shroud
P
Small Flashlight
Procedure
1)
Setup: Room lights darkened; bowl shroud on.
2)
From the Calibration main menu, select
INTENSITY
, then
WEDGE
, then
CALIBRATE.
Summary of Contents for humphrey HFA II-i series
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Page 424: ...Page 4 FA2i 013A PROPRIETARY and CONFIDENTIAL...
Page 502: ...FA2i 041 Page 3 Figure 2 Press rectangle in Top Left corner...
Page 516: ...Page 2 FA2i 046 Figure 1 Glass Film Wedge Detectors P N 67417 Note Spacing Washer Placement...
Page 517: ...FA2i 046 Page 3 Figure 2 Y Motor Turret Detector P N 67418 Note Spacing Washer Placement...