Lorrca MaxSis - Iteration Parameters Setting

Lorrca MaxSis Program
Page 64 Lorrca Maxsis User Manual
Version 5.04 MRN-231-EN
6.4.4.3. Iteration parameters setting
Settings parameter Description Range
Perform iteration
procedure
Checkbox, to include the iteration procedure for the
determination of the threshold shear rate (see
Appendix). The iteration procedure is determined
following measurement of the syllectogram. During
iteration, only one sample is taken per cup
revolution to avoid optical disturbances.
-
Intermediate
disaggregation
Checkbox to disaggregate the blood suspension
between successive measurement shear rates.
Intermediate disaggregation is recommended and
may be favourable as the standard procedure, since
potential aggregates will break down during
disaggregation, resulting in the same starting point
before each back-scatter measurement at a given
shear stress.
-
Samples per shear
rate
Number of back-scatter-intensity measurements to
perform at each shear stress. Each individual
sample is taken once per revolution, at the home
position. The program records both the mean back-
scatter and its standard deviation.
[2, 200]
Maximum deviation
(au)
When a new shear rate is adjusted, the aggregation
state of the suspension will gradually become
stable. The program checks the absolute error
between N successive data points and keeps on
sampling until the absolute error is smaller than the
value entered here or until an iteration-timeout
occurs.
[0.1, 0.5] au
Iteration timeout (s) When the aggregation signal does not get stable
within the time entered here, the measurement is
aborted and an error message appears.
[10, 3600] s
Binary search steps A binary search algorithm is used to automatically
generate two more shear rates to fine-tune the
rough procedure (which used shear rates obtained
from the user defined "iterate.txt" file). Each binary
search step results in two more shear rates to
measure the back-scatter intensity. They are chosen
centered between the current optimum shear rate
and next higher and lower shear rates. See also
Appendix.
[0, 100]
Sort results Checkbox, to sort the results: The lowest shear rate
first and the highest shear rate last (default). By not
-