Zeiss humphrey HFA II-i series, Field Service Manual

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Appendix H Humphrey Field Analyzer II - i
Confidential and Proprietary
Field Service Guide
H - 8 52235C1105
H.2 Automated Light Intensity Printouts
Automated Light Intensity Printouts provide a numerical and graphical representation of the
instrument’s current light intensity calibration. The printouts can only be obtained by selecting
the Verification button on the Calibration Main Menu.
To obtain the Automated Light Intensity Printout, perform the following:
1) Complete the light intensity Before or After verification as described in Section 4.
NOTE: The Mfg and QA selections are for manufacturing use only. Selecting either of these
two buttons will set tolerance values which are much tighter than those required for field service
evaluation.
2) Select Print . A single-page printout will be obtained on all non-blue-yellow models. On
blue-yellow models, a two-page printout will be obtained. The first page represents the
White Light Verification Data and the second page represents the Blue-Yellow Verification
Data.
Interpreting the Printouts
HFA II - i White Light Verification Data Printout
(Refer to sample printout on following page)
(1) Indicates whether the verification data was obtained either BEFORE or AFTER
servicing the
HFA II - i .
(2) Serial number of the HFA II - i .
(3) Serial number of the Soligor lightmeter being used to perform the verification.
(4) Revision level of the software currently installed in the instrument.
(5) The multiplier values (P1, P2, P3, P3F) written on the calibration label and affixed to
the Soligor lightmeter being used to perform the verification.
(6) The current white projector voltage required to obtain a 0 dB light intensity value.
(7) The dB spread or amount of dB difference between the highest and lowest light
intensity data points appearing on the graph (including the BOWL). For the White
Light Verification Data Printout, this value must be 1.0 dB or less.
(8) A numerical and graphical representation of each measured spot value (0 dB - 34 dB)
and the BOWL value. The tolerances (MIN and MAX), as well as the actual measured
value (READING), for each data point are indicated in Ft-L.
(9) The asterisk indicates a value that is out of tolerance. (
Note: The data point at 39 dB is
not used during field service evaluation.
)
(10) Light intensity data points. Nine data points (including the BOWL) are plotted to
indicate the attenuation produced by the glass and film wedges.
(11) Spot Ratio - for manufacturing use only.
(12) Location to be signed by the service technician performing the verification.