Vernier Data Pro - Manual (Page 31)

Data Pro 29
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Calculated Columns Tap
to either modify or add a
calculated column. You will be presented a list of the current calculated
columns to choose from, or you can create a new calculate column. Note:
You are permitted to make a calculated column based on a calculated
column, as long as you don’t exceed 10 columns as the total number of
columns (including data columns collected). You will be warned if you
try to exceed this number of columns.
•
If you elect to modify a currently existing calculated column, you will be
taken to a screen where you can choose to edit the column name, unit,
variables, and calculation.
•
Tip: Chemistry teachers and students may use the calculated column
feature to create plots of first and second derivatives from pH vs. volume
data, to help determine equivalence points (using the first and second
derivative column equations).
After selecting New Column, you will be taken to a screen where you can
create a new calculated column. Here you are prompted to give the new
column a name and assign it units.
Tapping will call up a list of equations for your new
column. You may be prompted to adjust the coefficients.
Likewise, tapping
will call up all available columns for use
as the X variable.
After you have created your new calculated column tap
. The new
calculated column will be graphed. Note: The new column you created will
be plotted on the same axis (x- or y-axis) as the column from which it was
created.