Xylem HandyLab 100 User Manual
Page 35

HandyLab 100
Operation
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03/2014
Calibration points
Calibration can be performed using one to five buffer solutions in any
order (single-point to five-point calibration). The meter determines the
following values and calculates the calibration line as follows:
Note
You can display the slope in the units, mV/pH or % (see page 30).
Stability control
The calibration procedure automatically activates the stability control
function. The current measurement with stability control can be termi-
nated at any time (accepting the current value).
Calibration record
The new calibration values are displayed when the calibration is fin-
ished.
Display calibration data
You can have the data of the last calibration displayed (see page 44).
Calibration evaluation
After calibrating, the meter automatically evaluates the calibration.The
zero point and slope are evaluated separately. The worse evaluation of
both is taken into account. The evaluation appears on the display and
in the calibration record.
Determined val-
ues
Displayed calibration data
1-point
Asy
Zero point = Asy
Slope = Nernst slope
(-59.2 mV/pH at 25 °C)
2-point
Asy
Slp.
Zero point = Asy
Slope = Slp.
3-point to
5-point
Asy
Slp.
Zero point = Asy
Slope = Slp.
The calibration line is calculated
by linear regression.
Display
Calibration
record
Zero point
[mV]
Slope [mV/
pH]
+++
-15 ... +15
-60,5 ... -58
++
-20 ... +20
-58 ... -57