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F. When Set (Water) appears press the “UP” key several
times to advance to the Span 1.51416 value, this value
is given as an example and may be different, although
close to the value on your AR200. Press the “MENU”
key, other points exist.
G. Follow the on screen instructions to apply “1.51416”
sample, allow time for the sample to equilibrate and
press “CAL” key.
H. To perform calibration of any additional points follow the
procedure outlined in steps A through G making sure
that you always start with the lowest refractive index
sample and moving up to the highest refractive index
sample.
I. Clean and dry the prism surface and the AR200 will be
ready to take readings.
Span 1.51416
Apply 1.51416
CAL = Calibration
MENU = Cancel
11.1 CALIBRATION OILS
The recommended Extended Precision Standard Calibration
Oils are manufactured by Cargille Labs, Cedar Grove, NJ
07009-1289 USA, Phone 201-239-6633. To our knowledge
they are the only domestic USA source of extended precision
standard calibration oils with six significant figures in index.
The characteristics of these oils are:
• NIST traceable.
• Stated accuracy at +/-0.00005 nD, shelf life in years.
• Temperature coefficients (TC) are guaranteed at their
specified reference temperatures, usually 20 or 25
o
C.
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