Waters 2489, Руководство оператора

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Using the operator interface 3-35
6. Enter the minimum AU, then press Enter.
Tip: The minimum AU field contains a threshold value. The RatioPlot
function does not plot if either wavelength does not exceed the minimum
AU threshold.
7. Enter the minimum ratio for the RatioPlot, then press Enter.
8. Enter the maximum ratio for the RatioPlot, then press Enter.
9. Return to the absorbance screen by pressing the HOME key.
Obtaining a MaxPlot
The detector allows you to obtain a MaxPlot by monitoring absorbance at two
selected wavelengths, while plotting the maximum absorbance for each
sample component.
To run a scan using the MaxPlot function:
1. Be sure the detector is operating in dual wavelength mode (see
“Changing from single to dual wavelength mode” on page 3-33 ).
2. From the absorbance screen, press Next to reach screen 3 of 5 ( Figure
“Secondary functions of the absorbance screen” on page 3-18 ).
3. In the Data out field, press 5, MaxPlot A,B.
4. Press Enter to select the MaxPlot function.
5. Return to the absorbance screen by pressing the HOME key.
Programming timed events, threshold events, and methods
The detector allows the storage and retrieval of up to five methods. The
detector references stored methods by the numbers 1 to 5. An asterisk in the
method number icon (see the table on
page 3-4 ) tells you the current
conditions are not stored. If you are operating using a stored method, the
method number appears on the absorbance screen (see the figure on
page 3-3 ).
If you edit a parameter such as wavelength or AUFS, you are editing the
current conditions (Method *), which can be stored as a method. You can store
the method in one of the 10 available method storage slots, or you can replace
the current method with one of the methods previously stored. When you
recall a previously stored method, you replace the existing method conditions
with those of the stored method.