Zeiss humphrey HFA II-i series, Field Service Manual

Page: 123 / 521

Humphrey Field Analyzer II - i Adjustment / Calibration
Confidential and Proprietary
52235C1105 4 - 21
Field Service Guide
5) Select
PROJECTOR
, then
WHITE
. Allow the projector lamp to warm up for 3 minutes
before proceeding.
6) Position the light meter roughly on the projected spot, then maximize the reading by
positioning the chinrest via the chinrest control switch. (First left/right, then up/down,
then refine with left/right again.)
7) Divide 929 by the P1 meter factor on your light meter.
8) Using the pads on the screen, increase or decrease spot intensity until your DMM reads
the closest to the result of the calculation done above. Try to set the spot intensity as
close to 929 Ft-L as you can. (It must be between 888 – 973 Ft-L, otherwise the
after
projector lamp intensity evaluation 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 WHITE. Also displayed on the CRT screen is the tolerance for
the bowl intensity calibration. If an asterisk (*) appears, this indicates that the value is
out of tolerance.
10)
STORE
the result. (It may take up to 2 minutes to process and store the new calibration
data. The instrument will ‘beep’ when the process is complete.)
11) Press
DONE
.
4.8.3.1.2 Blue
Purpose
This procedure ensures that the maximum brightness of the projected number V blue spot in
the bowl is close to the optimum 3.01 Ft-L.
Special Tools/Equipment Required
P
Soligor Light Meter Kit
P
Digital Multimeter, Fluke 8060A or equivalent
P
Bowl Shroud
P
Small Flashlight
Prerequisites
Before performing blue projector intensity calibration, verify the following:
P
Projection lamp filament voltage with lamp on. If voltage is over 10 volts, replace
lamp.
P
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)