Extract Portion of Signal Express VI

Owning Palette: Signal Manipulation Express VIs

Requires: Base Development System

Extracts portions of data from the input signals and returns the extracted data. You can extract a single point or a range of data, and you can extract data by time or index. You also can find the time and index of the first occurrence of a value.

Dialog Box Options

Block Diagram Inputs

Block Diagram Outputs

Add to the block diagram

Find on the palette

Dialog Box Options

Parameter	Description
Begin	Contains the following options: Begin at offset (x-axis units)—Starts the extraction when the signal crosses the value you specify in Offset. Offset—Value that Begin at offset (x-axis units) uses. The default is 0. Begin at sample number—Starts the extraction at the point you enter in Sample number. Sample number—Value that Begin at sample number uses. The default is 0.
Duration or Span	Contains the following options: Length (x-axis units)—Ends the extraction after the extracted signal is the length you enter in Length. Length—Specifies the value that Length (x-axis units) uses. The default is 1. Number of samples—Ends the extraction after the extracted signal contains the number of points you specify in Samples. Samples—Value that Number of samples uses. The default is 1. Remaining samples—Ends the extraction at the end of the signal.
Input Signal	Displays the input signal. If you wire data to the Express VI and run it, Input Signal displays real data. If you close and reopen the Express VI, Input Signal displays sample data until you run the Express VI again.
Result Preview	Displays a preview of the measurement. The Result Preview plot indicates the value of the selected measurement with a dotted line. If you wire data to the Express VI and run the VI, Result Preview displays real data. If you close and reopen the Express VI, Result Preview displays sample data until you run the VI again. If the cutoff frequency values are invalid, Result Preview does not display valid data.

Block Diagram Inputs

Parameter	Description
Signals	Contains the input signal or signals.
Begin Sample	Specifies the value that Begin at sample number uses. The value you wire to this input overrides the value you set in the configuration dialog box.
Begin Offset	Specifies the value that Begin at Offset (x-axis units) uses. The value you wire to this input overrides the value you set in the configuration dialog box.
Length	Specifies the value that Length (x-axis units) uses. The value you wire to this input overrides the value you set in the configuration dialog box.
Samples	Specifies the value that Number of Samples uses. The value you wire to this input overrides the value you set in the configuration dialog box.
error in	Describes error conditions that occur before this node runs.

Block Diagram Outputs

Parameter	Description
Section	Returns the extracted portion of the input signal.
error out	Contains error information. This output provides standard error out functionality.

This Express VI operates similarly to the following VIs and functions:

Get Waveform Subset