Thermo Fisher Scientific Eutech 2700 Series - Manual (Page 34)

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Before and after a two point ion calibration using 0.001 and 0.01 standards
5) The mV/decade slope value will be displayed if the calibration is successful.
“Slope Error” indicates that the calibration for the current point was not
successful. This occurs when the slope (mV difference between two
consecutive points) is < 15 mV/decade or > than 90 mV/decade.
6) Repeat steps 4 & 5 with additional ISE standards or press ESC to escape
and save your calibration.
At left; a three point ion calibration, at right; the Ion calibration report
To view the Ion Calibration Report at any time from the measure screen, press
REPORT.