Metrohm viva 1.1 (ProLab) - Manual (Page 501)

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5 Method
viva 1.1 (for process analysis)
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Input range 0 - 100 pixels
Default value 0 pixels
Parameters for the 089 Photometer
Blank value
Value by which the measured quantity (absorbance) is corrected. Here an
expression can also be entered through the formula editor (e.g. xx.EME
from other measuring command) by which every measured absorbance
value can then be corrected.
Input range -4,000 - 4,000 mAU
Default value 0 mAU
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: