Keithley 2651A Reference Manual

Section 7: Command reference Model 2651A High Power System SourceMeter® Instrument Reference Manual
7-242 2651A-901-01 Rev. A / March 2011
smuX.trigger.source.limitY
This attribute sets the sweep source limit.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes SMU reset
Instrument reset
Not saved smuX.LIMIT_AUTO
Usage
sweepSourceLimit = smuX.trigger.source.limitY
smuX.trigger.source.limitY = sweepSourceLimit
sweepSourceLimit
Source limit during triggered operation. Set to the desired source limit during
triggered operation, smuX.LIMIT_AUTO, or smuX.LIMIT_OFF (for
smuX.trigger.source.limiti)
X
SMU channel (for example, smua.trigger.source.limitv applies to SMU
channel A).
Y
SMU output function (v = voltage, i = current).
Details
Use this attribute to perform extended operating area (EOA) pulse mode sweeps.
If this attribute is set to smuX.LIMIT_AUTO (or 0), the SMU will use the normal limit setting during sweeping. If
this attribute is set to any other numeric value, the SMU will switch in this limit at the start of the source action
and will switch back to the normal limit setting at the end of the end pulse action.
Normally, the limit range is automatically adjusted in accordance with the desired limit value. During sweeping,
however, the limit range is fixed in order to avoid the delays associated with changing range. This fixed limit
range is determined by the maximum limit value needed during the sweep; that is, the greater of either the
normal limit value (as specified by smuX.source.limitY) or the sweep limit value (as specified by
smuX.trigger.source.limitY). Note that the minimum limit value that can be enforced during the sweep is
equal to 10% of the full scale value of the fixed limit range. If the smaller limit value (normal or sweep) falls below
this 10% threshold, the 10% value will be enforced instead. Likewise, if the limit value were to fall below the 10%
threshold as a result of power compliance, the 10% value will be enforced instead.
To disable the source current limit during triggered operation, set the smuX.trigger.source.limiti
attribute equal to smuX.LIMIT_OFF (or "off").
When using the EOA, the SMU will automatically start the end pulse action if the SMU is not triggered before its
maximum pulse width. It will also delay the source action if necessary to limit the pulse duty cycle to stay within
the capabilities of the SMU.
Example
smua.trigger.source.limitv = 10
Sets the voltage sweep limit
of SMU channel A to 10 V.
Also see
smuX.source.limitY (on page 7-217)
Configuring and running sweeps
(on page 3-29)
Triggering
(on page 3-32)

Keithley 2651A Specifications

General

Brand	Keithley
Model	2651A
Category	Measuring Instruments
Language	English