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9.4 Measurement
The data recording is carried out according to measurement site and the chosen tension.
The menu provides 10 measurement sites with 8 storage spaces each. Therefore it is easy
to reconstruct later where an under which conditions a data set was recorded. The
designated measurement site is chosen at the main menu respectively at the
measurement site menu. In the following sub menu it is to decide if the measurement site
is used or deleted.
Afterwards the memory space for the tension is chosen in an analogous manner. In the
according sub menu additionaly the menu item for calibration “Kalibrieren” can be found.
Before the sampling interval and the tension can be set up, the program checks if the
storage space is already used and if a complete calibration was proceeded. If not, a
corresponding note is shown at the display. If the memory space is taken it can be chosen
between using another memory space or deleting the current one. In case of an
incompletely calibration please follow the instructions at sub chapter “4.6 Calibration” on
page 16.
In the following two steps first the measurement interval and afterwards the tension is
set up. Subsequently the measurement itself begins. For each measurement a maximum
of 100 values can be recorded. But after reaching a steady flow rate only the preset
number of readings is recorded (more information under “4.5 Remarks for the
configuration of a measurement”). After this the measurement is finished and the menu
is automatically switched to the menu for choosing a memory space for a tension. The
steady state infiltration is marked with a wave symbol at the right end of the upper line.
During a measurement holding the “Start”-button (1 sec) cancels the measurement.
As the consistency of the flow rate can`t be verified consistently in case of discontinuities,
the measurement should always be canceled if any hold-ups occur (e.g. refilling). This way
you get a split data set.
9.5 Remarks for the configuration of a measurement
The configuration menu can be found at the menu item “Options”. In the according sub
menus it can be defined over how many differences of values the moving average is
calculated (1-5), how many values are recorded after reaching the steady state (1-50) and
for which difference between moving average and the last recorded value the flow rate
is assumed as constant (1-20%). Default values are 3, 20 and 5% and can be reset at the
sub menu “Default”.
If the moving average is set to 1 the flow rate is not checked for constant conditions and
the maximum number of values (100) is recorded.