Keithley 2601B Reference Manual page 52

Section 2: General operation
Setting the limit
Front-panel limit
Set the limit from the front panel as follows:
1. For the Model 2601B/2611B/2635B or the Model 2602B/2604B/2612B/2614B/2634B/2636B
single-channel display mode, press the LIMIT key to directly access limit editing. Pressing the
LIMIT key while in limit edit mode will toggle the display between the complementary function limit
and the power limit display.
2. For the Model 2602B/2604B/2612B/2614B/2634B/2636B, dual-channel display mode, press the
LIMIT key, then select CURRENT, VOLTAGE, or POWER as needed. Press the ENTER key or
the navigation wheel
3. Press the navigation wheel
4. Press the ENTER key or the navigation wheel
5. Press the EXIT (LOCAL) key to return to the main display.
Remote limit
The table below summarizes basic commands to program a limit. For a more complete description of
these commands, refer to the
Limit commands
Command*
smuX.source.limiti = limit
smuX.source.limitv = limit
smuX.source.limitp = limit
compliance = smuX.source.compliance
* smuX: For Models 2601B, 2611B, and 2635B, this value is smua (SMU Channel A); for Models 2602B,
2604B, 2612B, 2614B, 2634B, and 2636B, this value can be smua (for SMU Channel A) or smub (for
SMU Channel B).
To set the limit, send the command with the limit value as the parameter. The following programming
example illustrates how to set the current, voltage, and power limit to 50 mA, 4 V, and 1 W
respectively:
smua.source.limiti = 50e-3
smua.source.limitv = 4
smua.source.limitp = 1
The following programming example illustrates how to print the limit state:
print(smua.source.compliance)
A returned value of true indicates one of three things:
•
If the instrument is configured as a current source, the voltage limit has been reached
•
If the instrument is configured as a voltage source, the current limit has been reached
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Series 2600B System SourceMeter® Instrument Reference Manual
.
and set the limit to the new value.
TSP command reference
Description
Set current limit.
Set voltage limit.
Set power limit.
Test if in limit (true = in limit; false =
not in limit).
to complete editing.
(on page 7-1).
2600BS-901-01 Rev. B / May 2013