June 11, 2015, 715004752 Rev. A
Page 58
Analog out
(dual
λ
)
In addition to the selections for single
λ
above, you
can chart the same parameters on the other channel,
at a different wavelength, and you can chart the
following parameters:
• MaxPlot – Charts the absorbance of multiple
compounds with different absorbances at two
different wavelengths on a single data channel.
Scaling for MaxPlot is the same as for Absorbance
(above) except that the charted absorbance is the
larger of the two absorbances as measured on
channel A and channel B. The detector uses the
AUFS, absorbance offset, and voltage offset of the
selected channel regardless of which absorbance
(channel A or channel B) is larger.
Volts out = Larger absorbance (A or B) × 2 V/AUFS
(of selected channel)
• RatioPlot (A/B) – Charts the ratio of absorbances at
two wavelengths. Theoretically, the ratio is
constant for a pure chromatographic peak and
variable for an impure peak. This mode applies the
three ratio parameters on screen 5 of 5 (see the
figure below).
– Minimum AU: This setting defines the minimum
AU value for either wavelength (A or B) before the
actual ratio is calculated. Both absorbance values
(A and B) must be above this value or 0 V is
charted. If both absorbances are above this value,
the absorbances are divided (A/B) and charted.
The output voltage is scaled proportionally to the
ratio depending on the selected channel minimum
ratio and maximum ratio settings.
– Minimum ratio: An actual ratio equal to the
minimum ratio value results in 0 V being charted.
Table 3–1:
Detector functions (continued)
Function
Description
Summary of Contents for 2489
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