Page 24 13900-103 Rev. A
Calibration
Special Tools and Equipment
Note: Before performing any calibration of this instru-
ment, it is recommended that you read and fully
understand the information provided in this
manual.
The following tools and fixtures are required for
performance of the calibration procedures contained in
this document.
• Rubber Eyes (t-bar P/N 13717, kit P/N 13702 (contains
T-bar P/N 13717)). These test eyes are available as a
t-bar assembly or as part of a calibration kit.
CAUTION: USE ONLY A 13717 CALIBRATED RUBBER EYE
FIXTURE WHICH HAS BEEN VERIFIED FOR
ACCURACY AT THE REICHERT FACTORY WITHIN
THE LAST 6 MONTHS OR INCORRECT CALIBRA-
TION MAY RESULT.
• Rubber eye stand (P/N 13718 also part of 13702 kit).
This stand is a support for the t-bar and positions the
t-bar to the correct height and angle.
• Glass Eye (P/N 12430-800B, also part of 13702 kit).
The glass eye is used to set the alignment of the VVL
cameras for positioning of the measurement system.
• Service Software Card (P/N 13900-953, 13900-954).
This software provides the operating protocol when
performing the calibration tests.
Note: There are two different software cards which are
used for the AT550. The 1.00 revision (P/N 13900-
953) includes the calibration program which is
only used on the AT550 with version 1.00 and 1.01
operating software. The 1.17 revision (P/N 13900-
954) includes the calibration program which is
only used on the AT550 with versions 1.02 and
greater of operating software.
Procedure
This AT550 is an instrument which measures inter-ocular
pressure (IOP). If calibration of this instrument is required,
it is recommended that only personnel which were trained
by Reichert Ophthalmic Instruments perform this
calibration procedure.
Please follow this procedure in the order given, unless
otherwise instructed for calibration of the AT550.
CAUTION: THIS INSTRUMENT HAS ELECTROSTATIC
DISCHARGE SENSITIVE DEVICES (ESDS) WHICH
ARE SENSITIVE TO STATIC HIGH VOLTAGES
STORED IN AND TRANSFERRED BY THE HUMAN
BODY. OBSERVE CORRECT ESDS PRECAUTIONS
OR PREMATURE MALFUNCTION OF THIS
INSTRUMENT WILL OCCUR.
1. Place the instrument in an area that has ESDS
protection and observe the appropriate precautions.
2. Apply the correct input power to the unit as shown on
the data plate of the unit. When instructed, press any
button to continue. Refer to Figure CT-10 for an
example of the Data Plate.
3. Press the button below the MODE icon. Then press
the button below the SERVICE icon to access the
calibration information. Record the software version,
calibration date, and the total number of measure-
ments.
4. Remove the input power to the AT550.
5. Open the printer door by pushing on it above the
printout opening. Install the correct version of the
Service Software into the PCMIA slot. Refer to the
Special Tools & Equipment section for details of the
correct Service Software PCMIA card. Align the
printer paper in the door slot and close the Printer
Door.
6. Refer to the General Disassembly section of this
procedure and remove the side and top covers.
7. Apply the correct input power to the unit as shown on
the data plate of the unit. When instructed, press any
button to continue.
8. Press the button below the MODE icon. Then press
the button below the SERVICE icon to access the
Services Menu.
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