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2-4
2.3.2 Differential switching
The differential or
ß
oating switching con
Þ
guration is
shown in Figure 2-5. The advantage of using this con-
Þ
guration is that the terminals of the source or measure
instrument are not con
Þ
ned to the same matrix cross-
point. Each terminal of the instrument can be connect-
ed to any matrix crosspoint.
2.3.3 Sensing
Figure 2-6 shows how the matrix card can be con
Þ
g-
ured to use instruments that have sensing capability.
The main advantage of using sensing is to cancel the ef-
fects of matrix card path resistance (<1
Ω
) and the resis-
tance of external cabling. Whenever path resistance is a
consideration, sensing should be used.
Figure 2-5
Differential switching example
HI
LO
Source or
Measure
Rows
Columns
7012
H
L
H
L
DUT
Figure 2-6
Sensing example
Source HI
Sense HI
Sense LO
Source LO
Source or
Measure
Rows
Columns
7012
H
L
H
L
DUT
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