pH value
Multi 3630 IDS
38
ba77170e03
10/2017
5.2.5 Calibration points
Calibration can be performed using one to five buffer solutions in any order (sin-
gle-point to five-point calibration). The meter determines the following values
and calculates the calibration line as follows:
5.2.6 Calibration data
The calibration data can be displayed and then output to the interface.
Displaying the
calibration data
The calibration protocol of the last calibration is available in the menu
Calibra-
tion
/
Calibration record
. To open it in the measured value display, press the
<CAL_>
key.
24
Set the nominal buffer value for the measured temperature with
<
><
>
.
25
Accept the calibration value with
<ENTER>
.
The calibration display for the next buffer appears (voltage display).
26
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.
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
11.1.1).
