Vernier Software & Technology LQ2-LE Manuel D’Utilisation
LabQuest App
21
Interpolate
– Once you have performed a curve
fit, you can use the Interpolate function to read
values off of the fitted function. Choose
Interpolate from the Analyze menu to enable the
tool, then tap on the graph. The lines associated
with the Examine cursor now locate a position
on the fitted function, and coordinates along the
fitted line are shown in the summary box at the
right of the graph. You can tell that LabQuest is
in the Interpolation mode by the square cursor
shown at the Examine point.
values off of the fitted function. Choose
Interpolate from the Analyze menu to enable the
tool, then tap on the graph. The lines associated
with the Examine cursor now locate a position
on the fitted function, and coordinates along the
fitted line are shown in the summary box at the
right of the graph. You can tell that LabQuest is
in the Interpolation mode by the square cursor
shown at the Examine point.
Model
–Model allows you to manually fit a
chosen function to your data. Enabling the
Model tool displays a Model dialog box where
you can choose the desired model equation from
the drop-down menu.
The model parameters (e.g., A, B and C) are
adjustable. Change them by direct entry or by
using the up and down arrows. Upon choosing
the equation, LabQuest will display the modeled
function in the preview graph at left. Tap OK to keep this function and display the
modeled function on the Graph screen. To exit the Model tool without applying the
function, tap Cancel.
Tip: If no function appears when modeling, your parameters are defining a curve that is
outside of the plot window.
Model tool displays a Model dialog box where
you can choose the desired model equation from
the drop-down menu.
The model parameters (e.g., A, B and C) are
adjustable. Change them by direct entry or by
using the up and down arrows. Upon choosing
the equation, LabQuest will display the modeled
function in the preview graph at left. Tap OK to keep this function and display the
modeled function on the Graph screen. To exit the Model tool without applying the
function, tap Cancel.
Tip: If no function appears when modeling, your parameters are defining a curve that is
outside of the plot window.
Advanced
– Choosing Advanced from the
Analyze menu allows you to access advanced
analysis tools including Baseline Adjustment,
Fast Fourier Transform (FFT), and Peak
Integration.
analysis tools including Baseline Adjustment,
Fast Fourier Transform (FFT), and Peak
Integration.
o
Baseline Adjustment
– This tool applies
a factor that raises or lowers the x-axis.
Because the LabQuest App uses the x-
axis as its baseline when calculating an
integral, adjusting the baseline may
result in a better integral.
Because the LabQuest App uses the x-
axis as its baseline when calculating an
integral, adjusting the baseline may
result in a better integral.
o
FFT
– The FFT tool calculates a Fast
Fourier Transform of the selected data.
The FFT is displayed in a special graph
that can be analyzed. Tap OK to return to
the main graph. The peak frequency will
be displayed on the graph legend..
The FFT is displayed in a special graph
that can be analyzed. Tap OK to return to
the main graph. The peak frequency will
be displayed on the graph legend..