Metrohm viva 1.1 (ProLab) - Manual (Page 555)

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5 Method
viva 1.1 (for process analysis)
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Measurement
Two types of measurement can be selected, Measurement with drift
control or Measurement without drift control.
Selection Measurement with drift control | Measure-
ment without drift control
Default value Measurement with drift control
Measurement with drift control
The measurement is carried out drift-controlled if this option is
selected. The measurement is canceled as soon as the defined Signal
drift or the Stop measured value is reached or a defined Waiting
time has elapsed. The corresponding parameters are not visible if this
option is disabled.
Measurement without drift control
The measurement is carried out without drift control if this option is
selected. Measurement is continued for as long as one of the two stop
criteria Max. waiting time or Stop measured value is fulfilled. The
corresponding parameters are not visible if this option is disabled.
NOTE
A constant measured value is often only reached after a certain time, as
mixing and possibly the reaction itself require a certain time. The
response time of an electrode can also increase with time, i.e., reaching
a constant measured value takes longer and longer. Drift-controlled
measurement is particularly advisable in such cases, as the measured
values are not applied until equilibrium has almost been reached.
Measurement with drift control
If the Measurement with drift control option has been selected, then
the following parameters will be displayed:
Signal drift
The measured value is only accepted if the signal drift defined here has
been fallen short of.
Input range 0.1 - 999,000 mAU/min
Default value 1.0 mAU/min
Min. waiting time
The measured value is not accepted until the minimum waiting time has
elapsed, even if the signal drift has already been reached. The drift contin-
ues to be checked while the minimum waiting time is elapsing.