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10.0 MULTIPOINT CALIBRATION
The AR200 can be calibrated with up to 5 points using
distilled water and 4 user definable points (note that
these are set at the factory to match available NIST
certified standards). Performing a 2 point calibration will
provide the required accuracy needed, using distilled
water and a high refractive index NIST certified standard.
The AR200 has 3 points available as points that can be
chosen through the calibration mode menu. Two
additional points are available and modification of the
existing points can also be done through the “Add/
Delete/Edit” option in the calibration menu. When
entering this screen a message will appear “Warning,
Incorrect use of this function can corrupt your
instrument”. It is advisable to contact the technical
support group before using this feature. The 3, 4 and 5,
point calibrations is made available to allow the user to
precisely calibrate the instrument to certified standards
near the refractive index range where the measurements
are being made. Reference the procedure below to
perform the multipoint calibration. Always clean and dry
the prism surface between the application of samples
and be sure to proceed starting from the distilled water
up to the sample with the highest refractive index.
A. Turn the AR200 on by pressing the “MENU” key.
B. Press the “MENU” key again after the startup screen
appears to enter the Menu.
C. Press the “UP” key until Calibration is read on the
display and press the “MENU” key.
D. When Set (Water) appears press the “MENU” key and
follow the instructions on the display to add water and
press the “CAL” key.
E. Continue calibration process by repeating steps A
through C and proceed to the next step.
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