Scaling and Mapping Express VI

Owning Palette: Arithmetic & Comparison Express VIs

Requires: Full Development System

Changes the amplitude of a signal by scaling or mapping the signal.

Example

Dialog Box Options

Block Diagram Inputs

Block Diagram Outputs

Add to the block diagram

Find on the palette

Dialog Box Options

Parameter	Description
Scaling or Mapping Type	Contains the following options: Normalize—Determines the scale and offset necessary to transform the signal so that its maximum is Highest peak and its minimum is Lowest peak. Lowest peak—Specifies the minimum value used to normalize the signal. The default is 0. Highest peak—Specifies the maximum value used to normalize the signal. The default is 1. Linear (Y=mX+b)—Sets the scale mapping mode to be linear, which scales the signal based on a straight line. Slope (m)—Slope used for Linear (Y=mX+b) scaling. The default is 1. Y intercept (b)—Intercept used for Linear (Y=mX+b) scaling. The default is 0. Logarithmic—Sets the scale mapping mode to be logarithmic, which scales the signal based on a decibel reference. LabVIEW scales the signal using the following equation: y = 20log₁₀(x/db reference) db reference—Reference for the Logarithmic scaling. The default is 1. Interpolated—Scales the signals based on a table of values that are interpolated linearly onto a scaling factor. Define Table—Displays the Define Signal dialog box, which you use to define a table of values for Interpolated scaling.

Parameter

Description

Scaling or Mapping Type

Contains the following options:

Normalize—Determines the scale and offset necessary to transform the signal so that its maximum is Highest peak and its minimum is Lowest peak.
- Lowest peak—Specifies the minimum value used to normalize the signal. The default is 0.
- Highest peak—Specifies the maximum value used to normalize the signal. The default is 1.
Linear (Y=mX+b)—Sets the scale mapping mode to be linear, which scales the signal based on a straight line.
- Slope (m)—Slope used for Linear (Y=mX+b) scaling. The default is 1.
- Y intercept (b)—Intercept used for Linear (Y=mX+b) scaling. The default is 0.
Logarithmic—Sets the scale mapping mode to be logarithmic, which scales the signal based on a decibel reference. LabVIEW scales the signal using the following equation:
y = 20log₁₀(x/db reference)
- db reference—Reference for the Logarithmic scaling. The default is 1.
Interpolated—Scales the signals based on a table of values that are interpolated linearly onto a scaling factor.
- Define Table—Displays the Define Signal dialog box, which you use to define a table of values for Interpolated scaling.

Block Diagram Inputs

Parameter	Description
Signals	Contains the input signal or signals.
error in	Describes error conditions that occur before this node runs.

Block Diagram Outputs

Parameter	Description
Scaled Signals	Returns the scaled signals.
error out	Contains error information. This output provides standard error out functionality.

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

Waveform Scale and Offset

Example

Refer to the Express VI - Scaling and Mapping VI in the labview\examples\Express VIs directory for an example of using the Scaling and Mapping Express VI.

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