Keithley 237

Banana
Plug
:
Part#
BG-10-1
J'Cut J'Cut
r '
1
I.--
1 1/2"
___.J
(A)
Cut
off
insulation
with
knife.
Cut
off
outer shield.
'Insulation
over
inner shield
(B)
Strip
insulation
and cut
off
Inner
shield.
(C)
Cut
off
inner shield then strip inner conductor.
Slip
on
plastic cover.
(D)
Insert
wire
into
hole
and
wrap
around
body.
(E)
Screw
on
plastic cover.
Figure
2-21.
Triax
to
Banana
Plug
Modification
+
+
SECTION2
Operation
The
Model7152 matrix
card
can
also
be
used
by
a single
Source
Measure
Unit
for
remote
sensing.
For
remote
sensing, the
Source
Measure
Unit
could
be
connected to
the
matrix
card
as
shown
in
Figure 2-22. OUTPUT
HI/
GUARD,
SENSE
HI/GUARD,
SENSE LO
and
OUTPUT
LO are connected to separate
rows
for
maximum
switch-
ing
flexibility
and
optimum
low
current performance.
Making
the
SENSE LO
connection also connects
OUT-
PUT
LO
to
the
matrix
card
through
the
triax
connector.
However, since
it
is connected to the
inner
shield,
it
is
of
no
consequence
as
long
as
it
is
not
used
at
the
test fixture.
In
this test configuration,
OUTPUT LO
is accessed
at
the
Source Measure
Unit
banana
jack
so
that
it
can
be
inde-
pendently
switched.
The test configuration
in
Figure 2-22
"uses"
four matrix
rows. Remote sensing can
be
accomplished
using
three
matrix
rows
by
using
OUTPUT LO
at
the triax connector.
In
this configuration, SENSE LO
and
OUTPUT LO
use
the
same
row.
The
disadvantage to this is the loss of some
switching flexibility.
Another
option is
to
make
OUTPUT
LO
a system
common
that
is
not
routed
(not switched)
through
the
card. All commons are simply connected di-
rectly
to
the
OUTPUT LO
banana
jack.
For
high
current
applications
where
leakage current is
not
a consideration,
the
guard
paths
of
the
matrix card
can
be
used
for 4-wire
sensing
as
shown
in
Figure 2-23.
With
this configuration only
two
matrix crosspoints are
required
to accomplish
4-wire
connections
to
the OUT.
2-25