Xylem HandyLab 600 - Manual (Page 30)

pH value HandyLab 600
30 ba77064e01 03/2014
5.2.5 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:
5.2.6 Calibration data
22. Set the nominal buffer value for the measured temperature with
<><>.
23. Accept the calibration value with <ENTER>.
The calibration display for the next buffer appears (voltage display).
24. If necessary, use <M> to finish the calibration.
The calibration record is displayed.
or
Continue calibrating using the next buffer with <ENTER>.
After the fifth buffer has been measured the calibration is automat-
ically finished. Then the calibration record is displayed.
The calibration line is determined by linear regression.
Calibration Determined
values 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.
You can display the slope in the units, mV/pH or % (see section
7.1.1 S
ETTINGS FOR P H MEASUREMENTS , page 40).
The calibration record is automatically transmitted to the interface
after calibrating.