Hitachi PRIMAIDE 1440 Instruction Manual page 127

S
(baseline method)
Fig. 4-4
(8) Measurement of Drift
Drift is measured by using the data and baseline obtained
from the Raman spectrum of water (measurement
conditions are the same as in preceding subsection (4); but
measuring time is 15 minutes).
For the sake of simplicity, calculation can be performed on
the assumption that the output signal is zero at the
emission wavelength of 450 nm.
Read out the value corresponding to "S" from the
spectrum obtained with the time program.
Tangent
Calculate the Raman Peak of Water
When using the D-2500 chromato-data processor,
calculation can be made using the length (L in
mm) of S on the chart.
L
 2
S =
162
L: length of S (mm)
X: ATT setting of data processor used in
measurement
Refer to previous subsections (4) through (6) for
measurement and calculation of noise and
calculation of S/N ratio.
4 - 14
S
(tangent method)
x
(mV)
Baseline