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Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 3: Functions and features

2651A-901-01 Rev. A / March 2011 3-21

Linear staircase sweeps

As shown below, this sweep type steps from a start voltage or current value to an ending (stop) value.

A measurement is made at each point after source and measurement settling time.

Figure 35: Linear staircase sweep

Delay

Measure

Measure Measure

Step

Start

Stop

Measure

X = Measurement point

A linear staircase sweep is configured using a start level, a stop level, and the total number of points,

including the start and stop points. The step size is determined by the start and stop levels, and the

number of sweep points:

step = (stop - start) / (points - 1)

NOTE

The number of sweep steps actually performed is determined by the trigger count. Refer to Triggering

(on page 3-32) for more information.

The sweep can be either positive-going or negative-going, depending on the relative values of the

start and stop parameters. When the sweep starts, the output will go to the start source level. The

output will then change in equal steps until the stop level is reached. If the trigger count is greater

than the number of points specified, the SMU will start over at the beginning value.

To configure a linear staircase sweep use smua.trigger.source.linearY(). This function

configures the source values the SMU will output when performing a linear sweep. After configuring

the sweep you must also enable the source action by setting the following attribute:

smua.trigger.source.action

Keithley 2651A Reference Manual

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