ProLab 4000
pH
71
ba75646e03
12/2012
7.2.2
Measuring
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 background color is red until the measured
value is stable. When the measured value is stable, the background
color switches to green.
Regardless of the setting for
Autom. stability control
(see page 63) in
the
System
menu, you can start the
Stability control
function manually
at any time.
1
Perform the preparatory activities (see page 69).
2
Immerse the pH electrode in the test sample.
3
If necessary, select the pH parameter with
<MODE>
.
1
Highlight the channel of the electrode in the measured value
display.
2
If necessary, switch to the pH parameter with
<MODE>
.
3
Freeze the measured value with
<SC>
.
In the status line, [SC] is displayed.
4
With
<OK>
activate the
Stability control
function.
As long as the measured value does not meet the stability cri-
terion, the background color is red.
As soon as the measured value is stable, the background color
is green. The current measurement data is downloaded to the
interface. The measured values of all channels meeting the cri-
terion for stability control are marked by SC.
Содержание ProLab 4000
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Страница 86: ...pH ProLab 4000 86 ba75646e03 12 2012 Note A calibration line is determined for the two point calibration...
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