Tone Measurements Express VI

Owning Palette: Signal Analysis Express VIs

Requires: Full Development System

Finds the single tone with the highest amplitude or searches a specified frequency range to find the single tone with the highest amplitude. You also can find the frequency and phase for a single tone.

Example

Dialog Box Options

Block Diagram Inputs

Block Diagram Outputs

Add to the block diagram

Find on the palette

Dialog Box Options

Parameter	Description
Single Tone Measurements	Contains the following options: Amplitude—Calculates the amplitude of the detected single tone in volts peak (Vp). Frequency—Calculates the frequency of the detected single tone in Hertz. Phase—Calculates the phase of the detected single tone in degrees.
Search for Specific Frequency	Searches for a specific frequency in the tone. Contains the following options: Approximate frequency (Hz)—Center frequency to use in the frequency domain search for the single tone. The default is 10. This option is available only when you place a checkmark in the Search for Specific Frequency checkbox. Search (+/- % of approx. freq.)—Frequency width, as a percentage of the sampling rate, for the frequency domain search for the single tone frequency. The default is 5. This option is available only when you place a checkmark in the Search for Specific Frequency checkbox.
Results	Displays the measurements you configured this Express VI to perform and the calculated values of those measurements. You can click any measurement listed in the Measurement column, and the corresponding value or plot appears in the Result Preview graph.
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.
Approximate frequency (Hz)	Center frequency to use in the frequency domain search for the single tone. The default is 10. This option is available only when you place a checkmark in the Search for Specific Frequency checkbox.

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
Amplitude	Returns the amplitude of the detected single tone in volts peak (Vp).
Frequency	Returns the frequency of the detected single tone in Hertz.
Phase	Returns the phase of the detected single tone in degrees.
error out	Contains error information. This output provides standard error out functionality.

Example

Refer to the Express VI - Filter VI in the labview\examples\Express VIs directory for an example of using the Tone Measurements Express VI.

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