Extract Portion of Signal

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Updated2025-01-28
4 minute(s) read

Extract Portion of Signal

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


Option	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.

Inputs/Outputs

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.

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.

error in (no error) —

Describes error conditions that occur before this node runs.

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.

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.