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The following is from the Daqarta Help system.
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Cursor Delta Readouts

Macro: CursMode=Delta

To the right of the solid and dotted readouts are the Delta/ Sigma readouts. The default mode is Delta, indicated by the triangle symbol on the small button at the left end of the Y value. In this mode, the readouts show the difference between the dotted and solid cursors; the Delta values are always computed as Dotted minus Solid.

You can use Delta X to easily measure the time between certain features of a waveform, or, by setting solid and dotted cursor to read different channels, the time between features on different channels. If one channel is a stimulus and the other is a response, you can measure response latency.

In Spectrum mode, the Delta readouts allow easy measurement of frequency and amplitude differences. The Peak, Track, and Ratio buttons at the bottom of the Spectrum dialog can enhance this further: If a cursor is over a peak, the Peak option will interpolate from the adjacent spectral lines to give greatly improved precision. The Track option causes the solid cursor to automatically track the highest peak in the spectrum. The Ratio option shows the ratio of the cursor frequencies in the Delta X display, which is useful for harmonic measurements.


Macro Notes:

CursMode=Delta sets the Delta cursor readout mode, CursMode=Sigma sets Sigma mode, and CursMode=x toggles between them.


See also Cursors and Readouts, Cursor Sigma Readouts

Applications:

Frequency response

Distortion measurement

Speech and music

Microphone calibration

Loudspeaker test

Musical instrument tuning

Animal sound

Evoked potentials

Rotating machinery

Vehicle pass-by noise

Product test

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