Screen Zero Individual Adjust controls

Controls: Zero Dialog >> Screen Zero >> Individual >> Adjust
Macros: LI.ZeroScrnAdj, etc

The four edit controls below the Individual Screen Zero button are labeled via the Null buttons to the left of each: LI (Left In), RI (Right In), LO (Left Out) and RO (Right Out).

These controls are disabled unless the Individual button is active. (They are also disabled in Spectrum, Spectrogram, or Pitch Track modes). When enabled, the positions of each waveform trace may be controlled individually.

Note: Units for this control are always percent, regardless of the Units button state.

Entering a positive value will move the trace down on the screen. For example, if you enter 25 the display will be shifted down such that a point that was formerly at 25% of full scale will now be at zero. Likewise, negative values will move the trace up accordingly.

Although the screen positions will change relative to the Y axis, this will not affect cursor readouts, Trigger operation, or data saved to a file.

Note that if screen magnification is changed (PgUp or PgDn keys), each trace will be magnified or reduced relative to its own Zero position.

If you have two bipolar traces and you want to give half of the screen to each, set the Individual control for the one you want on top to -50% and the one you want on the bottom to 50%.

If you have unipolar traces (such as from an Arduino or DC-modified sound card, or from raw Generator traces with Offset set to be unipolar), set the top to 0 and the bottom to 100%.

For 4 bipolar traces, try these values:

    LI  -75 %
    RI  -25 %
    LO  25 %
    RO  75 %

For 4 unipolar traces, try:

    LI  -50 %
    RI  0 %
    LO  50 %
    RO  100 %

Macro Notes:

LI.ZeroScrnAdj=25 will set the Left In screen zero to 25%. Similarly, RI. (Right In), LO. (Left Out) and RO. (Right Out) prefixes will set those waveform channels accordingly.

A macro can read the current Screen Zero setting of the Left In waveform channel via X=LI.ZeroScrnAdj.

Note that these controls are disabled unless the Individual button is active (depressed), and the display is in waveform mode (neither Spectrum, Spectrogram, nor Pitch Track active). If you attempt to use a ZeroScrnAdj command when the button is disabled, the macro will abort with a "Control disabled. Aborting macro." message.

You can check if this control is enabled via an E.IF.ZeroScrnAdj= control enable IF test. You don't need to specify which control via LI. or other prefixes, since all are enabled or disabled together.

See also Zero (Screen and Data)