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Lesson 3
Object Properties
Use cursors that are locked to the plot. When the user clicks the Analyze
Selected Subset button, the VI reads the location of each cursor and
uses this information to find the DC, RMS, frequency, and amplitude
values of the subset of data.
Block Diagram
2. Open and complete the following block diagram as described in
steps 3 through 13.
3. Right-click the Data terminal and select Create»Property Node from
the shortcut menu to create the Data Property Node. Resize the Property
Node to four terminals. Right-click the node and select the Active
Cursor and Cursor»Cursor Index properties from the Properties
menu. Right-click each Active Cursor property and select Change to
Write from the shortcut menu.
Property Nodes execute from top to bottom. The Property Node selects
each cursor individually and returns the index of each cursor.
4. Place the Max & Min function, located on the Functions»All
Functions»Comparison palette, on the block diagram. This function
helps determine the beginning and ending index of the cursor locations.
© National Instruments Corporation
3-21
LabVIEW Development Course Manual