ProLab 2000
Operation
37
ba75577e03
11/2009
4.5.2
Measuring the pH value
Stability control
The Stability control function checks the stability of the measurement
signal. The stability has a considerable impact on the reproducibility of
measured values. The display of the measured parameter flashes until
a stable measured value is available.
Independent of the setting for automatic
Stability control
in the
System
menu, you can start the
Stability control
function
manually at any time.
Note
You can terminate prematurely the
Stability control
function with
<MENU/OK>
manually at any time. If the
Stability control
function is
terminated prematurely, the current measurement data is not
downloaded to the interface.
1
Perform the preparatory activities (see page 36).
2
Immerse the pH electrode in the test sample.
3
Select the pH or mV display with
<MODE>
.
pH
6.949
24.8
°C
26.04.06 10:37
1
If necessary, select a channel (measured value) with
<
▲
><
▼
>.
2
Freeze the measured value with
<SC>
.
The display switches to the display of the selected channel as
necessary.
In the status line, [SC] is displayed.
3
With
<MENU/OK>
activate the
Stability control
function.
[SC] flashes while the stability control is active.
As soon as a stable measured value is recognized, the current
measurement data is downloaded to the interface. The
measured values of all channels meeting the criterion for
stability control are marked by SC.