Zeiss humphrey HFA II-i series Field Service Manual page 112

Adjustment / Calibration
White Bowl Intensity Verification:
12) Select #61/BOWL. The bowl lamp warm-up period will begin. (You may cancel from
the warmup period when the voltage stabilizes at >20%.)
After the warmup period ends or when the voltage reading has stabilized:
13) Enter the voltage reading via the ten-key pad.
14) If the HFA II - i is equipped with the Blue-Yellow option, proceed to the Blue Spot
Intensity Verification below.
If the HFA II - i is NOT equipped with Blue-Yellow option, select PRINT to print out the
HFA II - i White Light Verification Data printout. Then proceed to Cal/Wedge printout
below.
Blue Spot Intensity Verification:
15) Select BLUE/YELLOW, and then #62/0dB.
16) Ensure that the light meter is set to position 3.
17) Position the light meter on the projected spot, then maximize the reading by position-
ing the chinrest via the chinrest control switch. (First left/right, then up/down, then
refine with left/right again. If you subsequently move the light meter accidently, repeat
this step in order to remaximize the meter reading.)
18) Enter the #62/0dB voltage reading via the ten-key pad on the screen and select
[Enter]. The calculated foot-lamberts will be displayed. Also displayed is the tolerance
for each reading. If an asterisk (*) appears, this indicates a reading that is out of
tolerance.
19) Repeat the procedure for each of the selections #63/3dB thru #65/13dB. (#66 and
#67 are not used at this time.)
Yellow Bowl Intensity Verification:
20) Select BLUE/YELLOW and select BOWL.
21) Allow 3 minutes for lamp warm-up and ensure that the light meter is set to position
3.
22) Enter the BOWL voltage reading via the ten-key pad on the screen.
23) Select DONE and then PRINT BOTH to print out both the HFA II - i White Light and
Blue-Yellow Light Verification Data printouts. Then proceed to Cal/Wedge Printout
below.
Field Service Guide
Humphrey Field Analyzer II - i
Confidential and Proprietary
4 - 10 52235C1105