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The following is from the Daqarta Help system.
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Zero Cursor (Zero Cr) Mode

Macro: ZeroMode=Curs

The default Zero mode is Zero Cursor, shortened to "Zero Cr" on the toolbar toggle button and on the duplicate in the Zero Mode control dialog. When you click either button or hit ALT+Z, the value of the waveform at the solid cursor position becomes the effective vertical center of the display.

This allows you to increase the display magnification (PgUp) as much as desired to view fine details. Otherwise, if the area of interest was not near true waveform zero, increasing magnification would tend to drive it off the screen.

Zero Cursor only affects the display; it does not change the cursor readouts, nor have any effect on the data saved to a file.

To change the zero position, toggle Zero Cr off, move the cursor to the new area of interest on the trace, and toggle Zero Cr back on again. The cursor value at the moment Zero Cr goes on is captured and becomes the new zero until you toggle it off.

If the display shows multiple channels, they are all shifted by the same amount. You can click the small color button next to the solid cursor readout to select the channel you are interested in, before toggling Zero Cr to capture a value.


Macro Notes:

ZeroMode=Curs sets Zero Cursor mode. Note that attempts to use this command in Spectrum or Histogram modes will result in "Control disabled. Aborting macro."


See also Zero (Cursor, Average, or Peak)

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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