Keithley 237 - Page 96

SECTION2
Operation
2.11
SELECT SOURCE
AND FUNCTION
OPERATE
[l)
D
11DDYIIAX
SOURCE
MEASURE
FUNCTION
v••
DC
•
•Dv
SWEEPD
-
-
SOURCE
COMPLIANCE
D
["="l
D
The available voltage source
and
current source ranges
are listed
in
Table 2-6
and
Table
2-7.
The selected source
will
behave as a constant
de
source
when
in
the
de
func-
tion, or sweep through a pre-defined list of source values
and
delay times
when
in the sweep function.
Table
2-6.
Voltage Source Ranges
Range
Model
(Max
Output)
Resolution
236,237 ±1.1000V
100J.1V
238
±l.SOOOV
236,237
±11.000V
1mV
238
±15.000V
236
23~238
±llO.OOV
10mV
237
±1100.0V*
100mV
Table
2-7.
Current
Source Ranges
Range
(Max Output)
Resolution
±1.0000nA
100fA
±10.000nA
1pA
±100.00nA
10pA
±l.OOOOJ.lA
100pA
±10.000J.1A
1nA
±100.00J.1A
10nA
±1.0000mA
100nA
±10.000mA
1J.1A
±100.00mA
10J.1A
±1.0000A*
100J,IA
"Model
238
only
Each source
(V
and
I)
will
"remember" its
own
unique
setup configuration.
Setup
configuration components
that are remembered for each source include:
• Source
value
and
range
2-44
+
+
•
Compliance limit
and
range
•
Integration time
• Filter
• Autorange
•
DCdelay
• Default delay
• Sense
• Sweep Parameters
The
SOURCE MEASURE
button
toggles the
Source
Measure
Unit between
Source
V,
Measure I
and
Source
I,
Measure
V.
The
FUNCTION
button toggles the Source
Measure
Unit
between de operation
and
sweep opera-
tion.
With the
de
function selected, the present source value
will
be
displayed
and
can
be
changed to any value within
the source range of the Source Measure
Unit.
Changing the
de
function source level also changes the
bias level of the sweep that is currently defined. Con-
versely, changing the bias level of a sweep
will
change
the de function source to
that
level.
Perform the following steps to set a source value
(V
or
I)
for de operation:
1.
If
the desired source is not already selected, press
SOURCE
MEASURE to select it.
2.
If
de
operation is not already selected, press FUNC-
TION
to select it (DC light on).
3.
Set
the source value using the Adjust
or
Keypad
method of
data
entry.
Adjust
Method:
Use
the rotary knob
and
the
SELECT
buttons to enter
the source value into the display.
Keypad
Method:
A.
Key in the source value using the DATA
ENTRY
keypad.
B.
Press ENTER.
If
the MANUAL TRIGGER light is
blinking,
the
source value will not
be
displayed
until the MANUAL TRIGGER button is pressed.
Changing
the
Source
Range (de operation)
The position of the decimal point indicates the source
range. For example, a reading of
+002.00V
indicates that
the
110V
range is selected, while a reading of
+02.000V
in-
dicates that the
11
V
or
15V range is selected.