Keithley 237 - 3.8.6 Digital and Display Checks

2.9.1
Entering Source
and
Compliance
Values
There
are
two
methods
to
enter
source
and
compliance
values:
the
Adjust
and
the
Edit
method.
The
Adjust
method
uses
the
rotary
knob
to
increment
or
decrement
displayed
values.
With
the
Edit
method,
the
value
is
en-
tered
using
the
keypad.
The
Adjust
method
is
more
convenient
to
use
when
mak-
ing
minor
"adjustments"
to
a
displayed
value.
The
Edit
method
is
probably
preferred
when
entering
a com-
pletely
new
value.
Adjust
Method
In
general,
the
Adjust
method
consists
of
placing
the
cur-
sor
(blinking digit)
on
the
digit
to
be
changed
using
the
SELECT
buttons
and
then
using
the
rotary
knob
to
dis-
play
the
desired
value.
Perform
the
following
steps
to
enter
a
source
or
compli-
ance
value
using
the
Adjust
method:
1. Enable
the
cursor.
With
source-measure
or
compliance displayed,
en-
able
the
cursor
by
either
turning
the
rotary
knob
one
detent
position (left
or
right),
or
by
pressing
a
SE-
LECT
button
(~
or
~).
The
cursor
position is indi-
cated
by
the
blinking digit.
2. Place
the
cursor
on
the
digit
to
be
changed.
The
cursor
can
be
placed
on
any
of
the
four
LSDs
(least significant digits)
of
the
five-digit display.
Pressing~
SELECT
moves
the
cursor
to
the
left.
Af-
ter
the
cursor
is
positioned
on
the
MSD
(most
signifi-
cant
digit),
each
press
of~
SELECT
changes
the
dis-
play
to
the
next
higher
range. Conversely,
pressing
SELECT
~
moves
the
cursor
to
the
right.
After
the
cursor
is
positioned
on
the
LSD,
each
press
of
SE-
LECT~
changes
the
display
to
the
next
lower
range.
3.
Change
the
displayed
value.
Turning
the
rotary
knob
clockwise increments
the
displayed
reading
and
conversely,
turning
the
knob
counter-clockwise
decrements
the
reading.
The
reading
can
be
incremented/
decremented
to
+I-
+
+
SECTION2
Operation
full
scale
of
the
selected range.
Any
digits to
the
right
of
the
cursor
are
not
affected
unless
the
reading
is
in-
cremented
or
decremented
to
full
scale.
In
this case
these
digits become
zeros
since
the
unit
cannot
dis-
play
a
reading
larger
than
full
scale.
When
adjusting
a
source
value,
the
polarity
of
the
displayed
reading
can
be
changed
by
pressing+/-
on
the
keypad.
4. Disable
the
cursor
by
pressing
ENTER
or
CANCEL.
Performing
another
operation,
such
as enabling
autoranging,
will
also disable
the
cursor.
NOTE
Changing
the
display
to
a
lower
range
with
SELECT
~
will
cause
a
displayed
reading
that
exceeds
that
range
to
default
to
the
maximum
reading
for
that
range.
For
ex-
ample,
with
2.000V
displayed
on
the
11
V
range,
changing
to
the
1.1Vrange
will
default
the
display
to
1.1000V.
Edit
Method
In
general,
the
Edit
method
simply
consists
of
keying
in
the
desired
value
from
the keypad
and
pressing
ENTER
To
enter
a
source
value,
the
unit
must
be
in
the
source-
measure
display
state
with
the
de
function selected. To
enter
a voltage
source
value,
SOURCE V MEASURE I
must
be
selected,
and
to
enter
a
current
source
value,
SOURCE I MEASURE
V
must
be
selected.
To
enter
a compliance
value,
the
unit
must
be
in
the
com-
pliance
display
state
(compliance enabled). To
enter
a
voltage compliance value,
SOURCE I MEASURE
V
must
be
selected,
and
to
enter
a
current
compliance value,
SOURCE V
MEASURE I
must
be
selected.
The
0
through
9,
+I-
and
EXP keys
are
used
to
key
in
val-
ues.
The
following examples
demonstrate
how
to
enter
values.
Value
Key
In
Displayed
Reading
Press
+l.'l!SV
1.25
+
l.'l!S
VOLTS
ENTER
-2.Z36V
+1-2.236
-2.236
VOLTS
ENTER
+3.26mA
.00326
+.00326
AMPS
ENTER
+3.26mA 3.26EXP+/-3
+3.26E-3
AMPS
ENTER
When
a
value
is
entered,
the
Source
Measure
Unit
will
go
to
the
optimum
source
or
compliance (measurement)
2-35