Series 2600B System SourceMeter® Instrument Reference Manual
Section 7: TSP command reference
2600BS-901-01 Rev. C / August 2016
7-267
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
Recall setup
Not saved
0 (smuX.LIMIT_AUTO)
Usage
sweepSourceLimit
= smu
X
.trigger.source.limit
Y
smu
X
.trigger.source.limit
Y
=
sweepSourceLimit
sweepSourceLimit
The source limit that is used during triggered operation; this attribute can be set to a
user-defined value,
smu
X
.LIMIT_AUTO
, or
smu
X
.LIMIT_OFF
(for
smu
X
.trigger.source.limiti
)
X
Source-measure unit (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
smu
X
.LIMIT_AUTO
(or
0
), the SMU uses 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 return to the normal limit setting at the end of the end pulse action.
Normally, the limit range is automatically adjusted in accordance with the 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
smu
X.
source.limit
Y
) or the sweep
limit value (as specified by
smu
X
.trigger.source.limit
Y
). Note that the minimum limit value
that can be enforced during the sweep is equal to 10 percent of the full scale value of the fixed limit
range. If the smaller limit value (normal or sweep) falls below this 10 percent threshold, the 10
percent value will be enforced instead. Likewise, if the limit value were to fall below the 10 percent
threshold as a result of power compliance, the 10 percent value will be enforced instead.
To disable the source current limit during triggered operation, set the
smu
X
.trigger.source.limiti
attribute equal to
smu
X
.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
Configuring and running sweeps
(on page 3-29)
(on page 7-240)
(on page 3-32)
