X1 Position
The
X1 Position
softkey defines the vertical line where X=0. The X1 marker
tracks the X1 position softkey in this menu. Because the X2 marker value is
assigned a delta value that is referenced to the X1 marker, you may notice
that the X2 marker moves in conjunction with the X1 marker. Moving the X1
marker moves all the mask points.
∆
X
The
∆
X
softkey moves the X2 marker. The value is given as a delta value
from the X1 marker to correspond with telecommunication applications.
Moving the X2 marker moves all mask points that do not have an X value of 0.
The
∆
X value usually represents a pulse width or bit period. For example, to
change a mask from a 1.44-Gbit pattern to a 2.88-Gbit pattern, simply change
the
∆
X value.
1 Level (Y2)
The
1 level (Y2)
softkey moves the Y2 marker that defines the horizontal
line, or 1 level, where Y=1. Moving the Y1 marker moves all mask points that
do not have a Y value of 0. The Y2 marker tracks the
1 level
softkey.
0 Level (Y1)
The
0 level (Y1)
softkey defines the horizontal line where Y=0. The Y1
marker tracks the
Y1 Position
softkey. This control is typically set to the
value that corresponds to a logical 0.
To change between ECL to TTL when viewing the mask, simply change the 0
level and 1 level settings.
Default Scale
When you press the
default scale
softkey, the scope sets the scaling of the
mask to be one division in from the edges of the graticule borders.
Mask results are updated whenever the scaling controls are changed.
Because it takes time to update the mask results, the oscilloscope responds
quicker to scaling changes when the mask test is turned off, or the oscilloscope
is in the stopped mode.
Mask Menu
Scale mask
23–8
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