HP 54750A, User Manual, Page: 156 / 478

The Digital Communications
Analysis Menus
Mask T est Menu
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1X The 1X function 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 1X value usually represents a pulse width or bit period. F or example ,
to change a mask from a 1.44-Gbit pattern to a 2.88-Gbit pattern, simply
change the 1X value .
K ey Path 4 Shift 5 4 Mask test 5
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Scale mask
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1X
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1 level (Y2) The 1 level (Y2) function moves the Y2 marker that denes 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 Y2 P osition
softkey .
K ey Path 4
Shift
5 4
Mask test
5
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Scale mask
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1 level (Y2)
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0 level (Y1) The Y1 P osition function denes the horizontal line where Y=0. The Y1
marker tracks the Y1 P osition softkey . This control is typically set to the
value that corresponds to a logical 0.
T o change between ECL to TTL when viewing the mask, simply change the 0
level and 1 level settings .
K ey Path 4
Shift
5 4
Mask test
5
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Scale mask
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0 level (Y1)
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Default scale When you press the
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Default scale softkey , the analyzer sets the scaling of
the mask to be one division in from the edges of the graticule borders .
K ey Path 4
Shift
5 4
Mask test
5
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Scale mask...
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Default scale
6-20