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Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 7: TSP command reference

2657A-901-01 Rev. B/December 2012 7-241

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 = smuX.trigger.source.limitY

smuX.trigger.source.limitY = sweepSourceLimit

sweepSourceLimit

The source limit that is used during triggered operation; set to a user-defined value

or smuX.LIMIT_AUTO (0)

Source-measure unit (SMU) channel (for example,

smua.trigger.source.limitv applies to SMU channel A)

SMU output function (v = voltage, i = current)

Details

If this attribute is set to smuX.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 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 percent 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 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.

Example

smua.trigger.source.limitv = 500

Sets the voltage sweep limit

of SMU channel A to 500 V.

Also see

Configuring and running sweeps (on page 3-28)

smuX.source.limitY

(on page 7-218)

Triggering

(on page 3-31)

Keithley 2657A User Manual

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