Metrohm 781 pH/Ion Meter - Manual (Page 78)

6.4 Potential measurement (U mode)
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780/781 pH/Ion Meter, Manual
6.4 Potential measurement (U mode)
6.4.1 Measuring parameters
PARAMETER U
├
measuring parameters
: ├
electr.id
├
drift
├
method
├
delta measurement
└
stirrer
The measuring parameters describe the settings which are of direct
importance for the measurement.
electr.id 12 ASCII characters
You can assign any name you like to the connected pH electrode. The
electrode Id will then be included in the report header for the output of
measured values.
drift 0.1...1.0...999.9 mV/min, OFF
A measuring signal which changes as a function of time is regarded as
being sufficiently constant when its drift drops below the value defined
here. This can be used as criterion for the pH/Ion Meter if a displayed
measured value is to be stored or documented by printing a report (see
print criterion and storage criterion in Section 5.2 and Section 5.3).
Please note that for a drift-controlled measured value recording this drift
parameter must not be set to ' OFF ', as otherwise no result will be ex-
ported.
If this drift condition is not fulfilled then this is indicated by two constant-
ly blinking triangles in the display.
An active drift control increases the reproducibility of the measurements
as a constant condition is used to define the measured result. A smaller
value for the measuring parameter Drift requires a more stable measur-
ing signal than a larger one. The set measuring parameter is also pro-
portional to the measuring uncertainty of the measured value obtained.
method 8 ASCII characters
All parameter settings can be stored together or loaded as a method
(see Section 6.1). The name of the current method is then given here.
This field is only used for information here and cannot be altered direct-
ly.