Zeiss humphrey HFA II-i series, Field Service Manual

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Adjustment / Calibration Humphrey Field Analyzer II - i
Confidential and Proprietary
Field Service Guide
4 - 22 52235C1105
P
Focus Calibration (Section 4.8.2.7)
P
White Projector Intensity Calibration (Section 4.8.3.1.1) (Required only if the Projector
Lamp position was adjusted.)
NOTE: Blue Correction Calibration (Section 4.8.3.4) MUST be performed following any
changes to the Wedge Calibration or the Blue Projector Intensity Calibration.
Procedure
1) Set up the Soligor light meter on the HFA II - i and zero out the meter (Appendix A).
2) Set the light meter to position 3.
3) From the Calibration main menu, select INTENSITY.
4) Set up the instrument as follows to calculate the foot-lamberts:
a) From the Intensity Menu, select P Factors (See Appendix A.2.19) or selectP1, P2
and P3 enter the P1, P2 and P3 factors from your Soligor Meter. Select
P3B,
P3Y and P3F if your light meter has these factors, otherwise enter the BYP3
factor on your meter for P3B and enter the P3 factor for P3Y and P3F.
b) Select METER and enter your light meter serial number.
C
Or you can use the Read P Factor floppy disk for this step.
5) Select PROJECTOR , then BLUE . 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 3.01 by the P3B meter factor on your light meter (or use BYP3 if your light
meter does not have a P3B factor).
8) Using the pads on the screen, increase or decrease spot intensity until your DMM reads
closest to the result of the above calculation. Try to set the spot intensity as close to
3.01 Ft-L as you can. (It must be between 2.87 – 3.15 Ft-L., otherwise the
after blue
projector 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 BLUE. 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
. (It may take up to 2 minutes to process and store the new
calibration data. The instrument will ‘beep’ when the process is complete.)