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Zero (Screen and Data)
Macros: Zero, ZeroDlg
The Zero options apply "DC offset" values to waveforms, shifting the waveform up or down on the trace. There are three basic kinds of Zero operation:
Screen Zero affects only the display; it does not change the cursor readouts, the Y axis, the Trigger operation, nor the data saved to a file. Use it when you want to examine a portion of the waveform at high display magnification (PgUp) to view fine details, without driving the region of interest off the screen. It affects all waveform traces at the same time.
Individual Screen Zero is like the above except that it offers separate control of individual traces, allowing them to be spaced to avoid overlap.
Data Zero affects the raw data (and hence the readouts, Y axis, Trigger, and file data), and is typically used to correct for drift or to calibrate the zero position in DC-coupled measurement and/or output systems.
The Zero toolbar button (or ALT+Z) toggles the waveform Screen Zero function on and off, but the actual position is set via the Screen Zero controls in the Zero dialog, which also includes the Data Zero controls. Click the thin button below Zero, or hit CTRL+Z to display the Zero dialog:
While the state of the toolbar button shows whether the Screen Zero is active, the button text shows if any Data Zero mode is active:
Zero=1 activates Screen Zero, Zero=0 turns it off, and Zero=x toggles between on and off.
Note that Zero is only enabled in waveform display modes (not Spectrum, Spectrogram, or Pitch Track). A macro that attempts to change the Zero state while disabled will result in the macro being aborted with an error message. You can check if this control is enabled via an E.IF.Zero= control enable IF test.
ZeroDlg=1 opens the Zero control dialog, ZeroDlg=0 closes it, and ZeroDlg=x toggles between open and closed.
Note that the dialog does not need to be opened to change Zero modes or values directly via macro commands.
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