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Applications
3.5.2 Cable connections
Source Measure Unit and test fixture connections to the
matrix card are accomplished using Model 7078-TRX.
These are three slot triax cables. On each Source Measure
Unit, the banana jack (5-way binding post) is used to access
OUTPUT LO. This connection is made using a Model 237-
Source Measure Units
Model 237
Model 236
4
1
2
3
5
6
Rows
A
X
B
X
C
X
D
X
E
F
G
•
H
7174A
Matrix Card
=
Model 237-BAN-3 or
Triax to banana plug
Modification (see Figure 2-4)
X
=
Crosspoints closed to
apply VDS to DUT #1
•
=
Crosspoints closed to
bias gate of DUT #1
Figure 3-10
Multi unit test system using Models 236 and 237 source measure units
3-10
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Note: Do not connect guards to the
DUT #1
7078-TRX
Cables
8
7
9 10 11 12
1
X
X
X
X
•
•
•
BAN-3 or the special cable constructed using the informa-
tion in Figure 2-4. This allows OUTPUT LO to be applied to
a signal pathway and independently switched. The guard
pathways of the matrix cards are used exclusively to extend
the driven guards of the Source Measure Units to the DUT to
eliminate the effects of leakage current.
DUT or short them together. If
guarding the inner panel, only
connect one guard line to it.
Test Fixture
DUT #3
DUT #2
2
3
4
5
6
7
8
9 10 11 12
7174A
Matrix Card
Crosspoint Switching
for all Rows
Inner
Panel
Warning: Test fixture chassis
must be connected
to a safety earth
ground.
Columns
Signal
Guard
Signal
Guard
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