Keithley 237

SECTION1
Getting
Started
1.10 SOURCE-MEASURE
EXAMPLES
To teach the basics
of
front
panel
operation,
two
simple
operating examples
are
presented
here.
For
de
operation,
the
Source
Measure
Unit
is
used
to
source I
and
measure
V
to
test
the
accuracy
of
a resistor
(100kn).
For
sweep
op-
eration, a linear staircase voltage
sweep
is
used
to
exam-
ine
the
breakdown
region
of
a
zener
diode.
For
those familiar
with
the
IEEE-488 bus,
an
HP
BASIC
4.0
program
is
provided
to
repeat
each test
over
the
bus.
At
the
factory,
the
IEEE
address
of
the
Models 236, 237,
and
238
are
set
to
16. The IEEE
address
is briefly
dis-
played
on
power
up.
NOTE
The Source
Measure
Unit
can
be
used
imme-
diately after
it
is
turned
on.
However,
to
achieve
rated
accuracy,
the
Source
Measure
Unit
must
be
warmed
up
for
one
hour.
1.1
0.1
De
Operation Example - Resistor
Test
In
this test,
the
Source Measure
Unit
will
be
used
to
source
100J.lA
through
a
100kn
resistor.
The
subsequent
voltage
drop
(=10V)
across
the
resistor
will
be
measured
and
displayed
by
the
Source Measure Unit.
Connect
the
Source
Measure
Unit
to
the
Model8006
test
fixture as
shown
in
Figure 1-16,
and
connect
the
resistor
as
shown
in
Figure 1-17.
1-22
+
+
Front
Panel
Operation
Step
1-
Select
Current
Source
Press
the
SOURCE
MEAS-
URE
button
to
select
Source
I
MeasureV
SOURCE MEASURE
V0
I
Ill
v
Step
2-
Select
de
Function
Press
FUNCTION
to
select
the
de
function.
FUNCTION
DC
•
SWEEP
D
This
button
toggles
between
the
voltage
source
and
the
current
source
Indicator
denotes
the
selected
source.
This
button
toggles
between
de
operation
and
sweep
opera-
tion.
Indicator
denotes
the
selected
function.
Step
3
-Enter
Source
Value
A.
Use
the
Data
Entry
key-
pad
to
key
in
+ 1
OOJ.LA.
I
+100E-6
AMPS
B.
Press
ENTER
C.
Press
MANUAL
TRIG-
GER
if its
indicator
is
blink-
ing.
+100.00J,LA
ST.BY
V
To
key
in
"E",
press
EXP
button.
MANUAL
TRIGGER
light
stops
blinking
and
100JlA
source
value
displayed.