Stat Fax 303 Plus, Руководство оператора

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18 Stat Fax 303 Plus Operator’s Manual Rev. J Awareness Technology, Inc.
The Regression Mode accepts calibrators, and calculates sample concentrations based on the
best fit (linear regression). Regressions may be calculated for linear or logarithmic data, as well
as log/logit data. A blank is optional. Duplicates, cutoff interpretation, and control options are
available.
In the Point to Point Mode , several calibrators may be read and a blank is optional. Line
segments connect the points for subsequent calculation of sample concentrations.
In the Percent Absorbance Multi-Point Mode , a point-to-point curve is generated, and the
absorbance of the A
0
calibrator is assigned 100%. Subsequent absorbances are reported as
both concentrations and percents of the A
0
calibrator. A blank is optional. Duplicates, cutoff
interpretation, and control options are available.
The Uptake Mode requires one calibrator and no blank. Concentrations are calculated based
upon a factor which equals the concentration of the calibrator multiplied by its absorbance. This
factor is divided by each subsequent absorbance to determine specimen concentration.
2.1.3 Quitting a Mode
If a test is to be saved in the user test menu, this must be done before canceling the mode. See
section 2.3.1 for instructions on Storing a User Test.
To quit a mode, press the CLEAR key twice. This may be done at any time. Mode selection keys
will not respond if they are pressed without canceling the previous mode first. Press the CLEAR
key twice before initiating the next mode.
2.1.4 Selecting Filters
Each mode begins by asking you to choose an operating filter and a differential filter. The filter
choices are shown below along with their keyboard assignments:
Standard Six UV Six VIS
Key 1: 405nm 405nm 405nm
Key 2: 450nm 450nm 450nm
Key 3: 492nm 492nm 492nm
Key 4: 630nm 630nm 630nm
Key 5: - 545nm 600nm
Key 6: - 340nm 545nm
First you will see “SELECT FILTER” in the display. Choose the correct number, and then press
ENTER. After the primary filter has been entered, you will see “SELECT DIF FILTR” . Again, use
the number keys to select the desired filter. You may select 0 for no differential filter if
monochromatic reading is desired (If so, refer to Section 2.4.5, Differential Absorbances). If you
enter an incorrect filter selection, press the CLEAR key twice to cancel the mode, and then begin
again with the primary wavelength. Your choices will be printed, and the operating mode will
resume.