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Select this option to apply a 100%T baseline correction (100%TBaseline) and a zero-
line correction (0%TBaseline) to the sample scan (S). This correction is performed with
the raw transmission data and is thus:
S
−
0%TBaseline
100%TBaseline
−
0%TBaseline
With this option, the Cary will prompt you to perform a 100%TBaseline first, followed
by a 0%TBaseline when you perform a baseline collection.
This baseline option corrects for any inherent variations in the electronic zero line of
the instrument. You should use this baseline option if your samples have areas of very
low transmission (high absorbance) as any variations in the instrument's zero line will
affect your measurements if they you do not correct for these. You should refer to ASTM
method E903 for further details.
Zero SRA correction
Select this option to apply a 100 %T baseline correction (100%TBaseline) and a zero-
line correction (0%TBaseline) to a sample (S) measured with an Absolute VW Specular
Reflectance Accessory (SRA).
Note
The VN SRA and the single bounce relative SRA accessories should not use this
correction. Select a Baseline/Zero correction instead.
This correction is performed with the raw transmission data and, due to the double
bounce on the sample, is thus:
S
−
0%TBaseline
100%TBaseline
−
0%TBaseline
With this option, the Cary will prompt you to perform a 100%TBaseline first, followed
by a 0%TBaseline when you perform a baseline collection. You should refer to ASTM
method E903 for further details.
Zero *Std. Ref. Correction
Select this option to apply a 100 %T baseline (100%TBaseline) correction and a zero-
line correction (0%TBaseline) to a sample (S) measured with a reflectance accessory
which is not absolute (e.g., a Diffuse Reflectance Accessory or the Variable Angle
Specular Reflectance accessory). The Cary then multiplies the result by the appropriate
value in the 'Baseline Stdref' file which are the transmission values associated with the
Standard Reference material you used to establish the baseline. Refer to the help for the
Diffuse Relectance accessories for further details about Standard Reference materials.
This correction is performed with the raw transmission data and is thus:
S
−
0%TBaseline
100%TBaseline
−
0%TBaseline
Baseline
Stdref
