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Specific points can be selected on the graph by touching the graph, a sliding cursor will appear. It is possible to
move the cursor by dragging left or right.
The curve fit algorithm can be changed by touching
. Select between linear through zero,
linear, quadratic through zero and quadratic.
The curve statistics are also displayed for the curve fit chosen. For example if the curve fit is y = mx+c the curve
statistics displayed will be the gradient of the line (m), constant (c) and correlation coefficient (r²).
Once all the standards have been measured touch
and then the unknown samples can be measured.
8.4
Sample Measurement
Place a cuvette containing the sample to be measured in the sample holder. Close the instrument lid and touch the
. Once the measurement is completed the concentration and photometric results will be shown on the screen
. Subsequent samples can be measured in the same way. If the wavelength is adjusted between sample
measurements then the instrument must be calibrated again and a new standard curve must be created before
more samples can be measured.
To change the curve fit at any time touch
to return to the standard curve screen.