Keithley 237 - Page 62

SECTION2
Operation
Inner Panel
A.
Inner Panel Connected
to
Circuit
Low
Figure
2-4.
Test
Fixture
Shielding
Output
HI
Sense
HI
r-'--
OUT
'--r--
Sense
LO
Output LO
A.
NoGuard
Figure
2-5.
Remote
Sensing
Configuration
As
a general rule, remote sensing should always
be
used
when
sourcing
or
measuring 1mA
or
more. Information
on
sensing is provided
in
paragraph 2.10.3. Remote sense
connections using the
Model8006
test fixture are covered
in paragraph 2.3.3.
2.3.3
Model 8006
Component Test
Fixture
The Keithley
Model8006
test fixture
was
designed to
be
used with the Source Measure
Unit.
The Model8006
test
fixture has two axial Kelvin test clips, five radial sockets
to accommodate two to 12-pin devices,
and
a DIP socket
for IC packages with
up
to 28-pins. The test fixture has 12
3-lug bulkhead
triax
input
connectors
that
will
allow con-
2-10
+
+
HI
LO
Inner Panel
B.
Inner
Panel Connected
to
Chassis
Ground
Output
HI-
_(\
v
Guard
Sense
HI
(\
u
Guard
r--
OUT
'---
Sense LO
Output
LO-
B. Guarded
nections to
up
to four Source Measure Units. A connec-
tion panel
and
banana
plug
jumper cables are provided
to make connections to the DUT simple.
NOTE
Detailed information for making connections
to the DUT
at
the connection panel of the test
fixture
is
provided
in
the
Model8006 Instruc-
tion Manual.
Figure 2-6A shows
how
the Source
Measure
Unit
can be
connected to the Model
8006
for local sensing. A 3-slot
triax cable (Model7078-
TRX)
is
used to connect
OUTPUT
ffi
of the
Source Measure
Unit
to the test fixture.
This
triax cable also extends the driven
guard
to the test fix-
ture. The easiest
way
to connect
OUTPUT LO
of the