Keithley 237 - Page 101

SECTION2
+
Operation
HP
BASIC
4.0
Programming
Example:
Standby
Definition
OUTPUT
716;
L,OX
Enable
autorange
Complete
information
concerning
the
IEEE-488
bus
and
this
command
can
be
found
in
Section 3 IEEE-488 Refer-
ence.
2.14 OPERATE
OPERATE SOURCE
MEASURE
FUNCTION COMPLIANCE
D
VEJI
DC
EJ
D
•Dv
SWEEP[]
[·:=~j
•
0 0 0
1100YMAX
SOURCE
A
source
cannot
be
applied
to
the
output
unless
the
unit
is
in
operate.
The
unit
can
only
be
placed
in
operate
when
it
is
in
the
source/measure
display
state.
The
unit
can
be
placed
in
standby
(OPERATE
light
off)
while
the
unit
is
in
any
display
state.
Toggling
the
sources
(V
to
I,
or
I
to
V)
will
also
place
the
unit
in
standby.
DC
Operation-
With
the
de
function
selected,
enabling
operate
will
apply
the
source
to
the
output.
If
the
MAN-
UAL
TRIGGER
light
is
blinking,
a
trigger
is
needed
to
start
making
measurements.
Sweep
Operation
-
With
the
sweep
function
selected,
enabling
OPERATE
will
source
(but
not
measure)
the
bias
level
of
the
sweep.
The
sweep
itself
will
not
start
un-
til
the
appropriate
trigger
occurs
(as
denoted
by
the
blinking
MANUAL
TRIGGER light).
WARNING
To
avoid
electric
shock,
always
assume
that
a
hazardous
voltage
is
applied
to
the
output
when
OPERATE
is
enabled.
Operate
toggles
the
unit
between
the
operate
and
standby
states.
When
in
the
operate
state,
the
OPERATE
light
is
turned
on.
When
in
standby,
the
"STBY"
message
will
be
displayed
when
the
unit
is
in
the
source/
measure
display
mode.
+
In
standby,
the
output
of
the
Model236
/237/238
is
deter-
mined
by
whether
it
is
in
Source
I
Measure
V,
or
Source
V
Measure!.
Source
I
Measure
V
-
In
standby,
the
Source
Measure
Unit
will
output
OV
on
the
l.lV
(Model236/237)
or
l.SV
(Model
238)
compliance
voltage
range.
The
compliance
current
limit
is
determined
by
the
programmed
current
source
value
and
range.
If
the
programmed
current
source
value
is
on
a
range
lower
than
the
lOOJ.LA
range,
then
the
compliance
current
limit
will
be
lOOJlA
on
the
lOOJ.LA
range.
The
following
examples
illustrate
this:
Programmed
Current
20nA
on
the
lOOnA
range
SJ.LA
on
the
lOJ.LA
range
Standby
Current
lOOJ.LA
on
the
lOOJ.IA
range
lOOJ.LA
on
the
lOOJ.LA
range
If
the
programmed
current
source
value
is
on
the
lOOJ.IA
range
or
above,
that
range
will
be
used.
The
current
value
used
is
the
programmed
current
value
or
lOOJ.LA,
which-
ever
is
greater.
The
following
examples
illustrate
this:
Programmed
Current
90J.LA
on
the
lOOJ.LA
range
120J.IA
on
the
lOrnA
range
lmA
on
the
lOOmA
range
Standby
Current
lOOJ.LA
on
the
lOOJ.IA
range
120J.IA
on
the
lOrnA
range
lmA
on
the
lOOmA
range
Source
V
Measure
I -
In
standby,
the
Source
Measure
Unit
will
output
OV
on
the
1.1
V
(Model236
/237)
or
l.SV
(Model
238)
voltage
source
range.
The
compliance
cur-
rent
limit
is
determined
by
the
programmed
current
com-
pliance
value
and
range.
If
the
programmed
current
com-
pliance
value
is
on
a
mage
lower
than
the
lOOmA
range,
then
the
compliance
current
limit
will
be
lOOmA
on
the
lOOmA
range.
The
following
examples
illustrate
this:
Programmed
Current
20nA
on
the
lOOnA
range
SJ.LA
on
the
lOJ.LA
range
Standby
Current
lOOJ.IA
on
the
lOOJ.LA
range
lOOJ.LA
on
the
lOOJ.LA
range
If
the
programmed
current
compliance
value
is
on
the
lOOJ.LA
mage
or
above,
that
range
will
be
used.
The
com-
pliance
current
limit
will
be
the
programmed
current
value
or
1%
of
the
programmed
range,
whichever
is
greater.
The
following
examples
illustrate
this:
Programmed
Current
SOJ.LA
on
the
lOOJ.IA
range
lSOJ.LA
on
the
lOOmA
range
lOOJ.LA
on
thelmA
range
Standby
Current
SOJ.LA
on
the
lOOJ.IA
range
lmA
on
the
lOOmA
range
lOOJ.IA
on
thelmA
range
2-49