ZEISS
Left Tool Area and Hardware Control Tools
LSM 880
192
000000-2071-464
10/2014 V_01
5.3.4
Setup – Fit
The
Fit
tool allows you to load a model to be used
for the measurement as well as to define new
models. Loading a predefined method
The
Fit
tool menu allows you to load in a fit model
and define how the parameters are to be fitted.
•
Click on the
Fit
tool tab to open the
Fit
tool
(Fig. 272). Click the tool tab again to close the
panel.
•
Select a channel by pressing a
Ch
button. There
will be as many channels available (auto- and
cross-correlation as had been selected in the
Light Path
tab).
The example shows a configuration with
GaAsP1
and
GaAsP2
auto-correlation as well as a
Cross
Correlation
GaAsP1-GaAsP2 cross-correlation
channels activated. Note that channels will only be
active if selected in the current configuration. To
each channel a different Fit model can be assigned.
•
Click on the arrow of the
Model
drop down
menu to display a list of pre-defined models
and select one of them. This will load the model
for this channel. The model name will be shown
in the
Model
display box and the
corresponding model will be shown in the
Model
table. The table has the following
entries:
−
Fit range start:
Designates the start value of the correlation function taken into account for the fit.
You can change the value by typing in the display box.
−
Fit range end:
Designates the end value of the correlation function taken into account for the fit.
You can change the value by typing in the display box.
−
Parameter:
designates the parameter by its name. You can activate or deactivate the parameter by
ticking / de-ticking the check box. Only if the parameter is activated it will be taken into account for
the fit.
−
Value
: designates the currently assigned value of the parameter. You can change the value by
typing in the display box.
−
Type
: designates if a parameter is free floating or if its value is fixed or should be used as a start
value. You can choose between these options in the drop down menu by selecting
Free
,
Start
and
Fixed
, respectively.
−
Lower Limit
: defines the lower limit value as a fit parameter; f this value is falls short, the fit is
rejected and another (global) minimum is searched for. You can change the value by typing the
value in the display box. The default value depends on the parameter, but is in most cases 0. (Only
available if the
Limits…
button is pressed that will open the
Fit parameter
window (Fig. 273)).
−
The text field displays in yellow any constraints or errors of the defined fit model.
Fig. 272
Fit tool
Summary of Contents for LSM 880
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