SECTION2
Operation
2.12 SET
COMPLIANCE AND
MEASUREMENT RANGE
OPERATE
SOURCE
MEASURE
FUNCTION
COMPLIANCE
[l]
vD•
DC
D
•
1Dv
SWEEPD
[·=~
D D
D
-
11DOVMAX
SOURCE
Compliance limits are set in order to protect external cir-
cuitry (i.e. DUT) from damage. When sourcing voltage, a
current compliance limit
is
set
The Source Measure
Unit
will
never source a current that
will
exceed the pro-
grammed current compliance limit. For example, assume
that
current>
lOmA
will
damage a current-sensitive
2k.Q
device. Thus, the current compliance limit
would
be
set
to lOmA.
If
the Source Measure
Unit is programmed to
source
40V it would normally source 40V
at
20mA
to the
2k.Q
load
(40V
I
2k.Q
=
20mA).
However, since the cur-
rent compliance limit
is
set
at
lOmA, the Source Measure
Unit
will
only source
20V
at
lOmA
(2k.Q
x
lOmA
=
20V).
Conversely,
when
sourcing current, a voltage compli-
ance limit is set. The Source Measure Unit
will
never
source a voltage that
will
exceed the programmed
com-
pliance voltage limit.
CAUTION
With
an
external source
or
energy storage de-
vice connected to
the
output, current
is
not
limited
when
in
Source I Measure V.
Refer to
paragraph
2.26
for precautions against exces-
sive current
that
could damage
the
Model
236/237
or
external circuitry.
Setting compliance sets the maximum measurement
range of the Source Measure
Unit.
For example, setting a
compliance of
SV
will
mean that the Source Measure
Unit
can measure
up
to
but
not more than
±SV.
A larger meas-
urement range can
be
selected
(if
available),
but
again,
the maximum measured reading
will
be
the compliance
value. A measurement range that is lower than the com-
pliance value cannot
be
selected, unless AUTORANGE is
enabled. Trying to
do
so from the front panel will default
the displayed compliance value to the maximum reading
of the selected measurement range.
With AUTORANGE enabled, the Source Measure
Unit
will
automatically downrange to the lowest possible
(most sensitive) range to make measurements.
2-46
+
+
When compliance is selected, the present compliance
limit
is
displayed
and
can
be
changed to any value
within
the measurement range of
the
Source Measure
Unit. The
measurement ranges of the Source Measure
Unit
are
listed in Table 2-8
and
Table
2-9.
Table
2-8.
Current
Measurement
Ranges
Range
R
..
inn
(Max
Output)
4d
Sd
±InA
lOOfA
lOfA
±lOnA
lpA
lOOfA
±lOOnA
lOpA
lpA
±lJ.lA
lOOpA
lOp A
±lOJ.lA
lnA
lOOp
A
±lOOJ.lA
lOnA
lnA
±lmA
lOOnA
lOnA
±lOrnA
lJ.lA
lOOnA
±lOOmA
lOJ.lA
lJ.lA
±lA*
lOO_M.
lOJ.IA_
*Model
238
only
Table
2-9.
Voltage
Measurement
Ranges
Range
R~Rnf
.
nn
Model
(Max
Output)
4d
Sd
236,237
±1.1000V
lOO~.tV
lO!J.V
238
+l.SOOOV
236,237
±ll.OOOV
lmV
1001J.V
238
+ts.ooov
236 237 238
+no.oov
lOmV
lmV
237
±llOO.OV
lOOmV
lOmV
Perform the following steps to check
and/
or
change the
compliance limit of the currently selected source.
1.
Press COMPLIANCE to enable
and
display the com-
pliance limit. For example,
if
the present compliance
limit for the voltage source is
±SOmA,
the following
will
be
displayed:
±OSO.OOmA
COMPLI
2.
If
the displayed compliance limit is not to
be
changed, disable compliance
by
again pressing
COMPLIANCE to
return
to normal operation.
Oth-
erwise, change
the
compliance limit using the Adjust
or
Edit method of
data
entry.
If
not familiar with the
entry methods, refer to paragraph
2.9
for complete
details.
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