Keithley 237

Source
Measure
Unit
to
the
test fixture
is
to
use
a single
conductor
banana
plug
cable
as
shown.
Inside
the
test fix-
ture, connections
to
the
DUT
are
made
with
mini-jack
jumper
cables.
If
the
driven
guard
is
going
to
be
used,
a
guarded
mini-jack
jumper
cable
would
be
used
to
extend
guard
to
the
OUT
as
shown
in
Figure 2-6B.
Figure 2-7 A
shows
how
the
Source
Measure
Unit
is con-
nected
to
the
Model8006
test fixture for
remote
sensing.
Three
3-slot triax cables
are
used
to
route
the
4-wire con-
nections
to
the
test fixture.
The
two
triax
cables for
OUT-
PUT
ffi
and
SENSE
ffi
also
extend
the
driven
guard
to
the
test fixture.
Inside
the
test fixture, 4-wire connections
to
the
OUT
are
made
with
mini-jack
jumper
cables.
If
the
driven
guard
is
going
to the
used,
two
guarded
mini-jack
jumpers
would
be
used
to
extend
guard
to
the
OUT
as
shown
in
Figure
2-7B.
NOTE
By always connecting
the
three
triax
connec-
tors
of
the
Source
Measure
Unit
to
the
Model
8006
test fixture,
remote
sense
and
guard
will
always
be
available
at
the
connection
panel
of
the
test fixture.
70711-TRX
Cables
Model2361237/238
Model8006
Test
Fixture
WARNING
: To avoid
electric
shock.
test fixture
chassis
must
be
connected
to a safety
earth
ground.
A. Source Measure Unit
Connections
to
Test Fixture
+
WARNING
SECTION2
Operation
With
remote
sensing
enabled,
an
open
sense
lead
will
result
in
lethal
voltages
appearing
at
OUTPUT
HI
and
GUARD.
This
voltage
can
cause
injury
or
death,
and
damage
exter-
nal
circuitry.
Always
make
sure
that
the
sense
leads
are
properly
connected
before
enabling
remote
sense. NEVER
change
con-
nections
with
power
applied.
Be
sure
to
al-
ways
discharge
and/or
disconnect external
power
sources.
The
two
inner
connection
panels
of
the
Model
8006 test
fixture
are
insulated
from
the
outer
casing
which
is con-
nected
to
chassis
and
a safety
earth
ground.
As
a general
rule,
when
extending
guard
to
the
OUT,
also connect
the
inner
panels
to
the
driven
guard.
Guarding
these
panels
helps
reduce
the
capacitance
seen
between
otherwise
un-
guarded
areas
and
the
test fixture chassis.
As
a result,
source-measure
speed
at
low
current
levels
can
be
sig-
nificantly increased.
If
guarding
is
not
necessary, the
panels
can
be
connected
to
circuit
low
(or chassis)
to
im-
prove
shielding.
236/237/238
8006
Test
Fixture
B.
Connections Schematic
(Guard extended
to
DUT)
Figure 2-6.
Local
Sense Connections Using Model8006 Test Fixture
+
2-11