pH value
Multi 3620 IDS
38
ba77169d06
10/2021
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
The calibration data can be displayed and then output to the interface.
Displaying the cali-
bration 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.
The calibration records of the last 10 calibrations are available in the menu
Cali-
bration
/
Calibration data storage
/
Display
. To open the
Calibration
menu in the
measured value display, press the
<MENU/ENTER>
key.
24.
Set the nominal buffer value for the measured temperature with
<
><
>
.
25.
Accept the calibration value with
<MENU/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
<MENU/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).
