# :MTESt:XDELta

:MTESt Scaling Commands

- :MTESt:ALIGnment:X
- :MTESt:ALIGnment:X:METHod
- :MTESt:ALIGnment:Y
- :MTESt:ALIGnment:Y:METHod
- :MTESt:AOPTimize
- :MTESt:X
- :MTESt:XDELta
- :MTESt:Y
- :MTESt:YTRack

## Command Syntax

    :MTEStN:XDELta <time>

<time> is a double.

Where N identifies a specific mask and must be a value from 1 to 16 {1:16}. For example, `:MTESt2` selects mask 2.

## Query Syntax

    :MTEStN:XDELta?

## Description

Sets the time difference between the mask's left edge (X1 marker) and right edge (X2 marker). In the mask test coordinate system, the X1 marker defines where X=0; thus, the X2 marker defines where X=1. Because all X vertices of regions defined for mask testing are normalized with respect to X1 and XDELta, redefining XDELta also moves those vertices to stay in the same locations with respect to X1 and XDELta. Thus, in many applications, it is best if you define XDELta as a pulse width or symbol period. Then a change in data rate, without corresponding changes in the waveform, can easily be handled by changing XDELta. The X-coordinate of region vertices are normalized using the equation:

X = (X)(XDELta) + X1