Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 248)

4.4 Evaluation
236
PC Control / Touch Control
2 nd Derivative
Break point
Measured value
Volume or Time
Fig. 4.17: Evaluating a breakpoint
4.4.5 Rate evaluation (EVAL RATE)
The rate evaluation produces the average dosing rate in a defined
range (so-called window).
The average dosing rate is determined by linear regression using at
least three measuring points. If dosing is carried out with one dosing
device only and more than one cylinder volume is dosed then the aver-
age dosing rate will be reduced because of the filling time.
When the command is opened for the first time you will see that it al-
ready contains a window which covers the whole time range. You can
add and edit new windows with [New]. Up to nine windows can be de-
fined. The selected window can be removed from the list with [Delete].
You can use [Edit] to adapt the upper and lower limits for the selected
window.
• Lower limit #: Time for the lower limit of the window.
• Upper limit #: Time for the upper limit of the window.
All calculable variables can also be applied as result variable R1…R9.
That means that you have to define the results in a preceding CALC
command. In contrast to a DET/MET titration the individual windows
may overlap each other.