Series 2600B System SourceMeter® Instrument Reference Manual
Section 7: TSP command reference
2600BS-901-01 Rev. B / May 2013
7-247
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)
smuX.source.limitY
(on page 7-223)
Triggering
(on page 3-32)
Summary of Contents for System SourceMeter 2601B
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