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Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 7: Command reference

2651A-901-01 Rev. A / March 2011 7-327

Usage

SweepILogMeasureV(smu, starti, stopi, stime, points)

smu

System SourceMeter

instrument channel (set to smua)

starti

Sweep start current in amperes

stopi

Sweep stop current in amperes

stime

Settling time in seconds; occurs after stepping the source and before performing a

measurement

points

Number of sweep points (must be ≥2)

Details

Data for voltage measurements, current source values, and timestamps are stored in smuX.nvbuffer1.

If all parameters are omitted when this function is called, this function is executed with the parameters set to the

default values.

Performs a logarithmic current sweep with voltage measured at every step (point):

1. Sets the smu to output starti amperes value, allows the source to settle for stime seconds,

and then performs a voltage measurement.

2. Sets the smu to output the next amperes step, allows the source to settle for stime seconds, and

then performs a voltage measurement.

3. Repeats the above sequence until the voltage is measured on the stopi amperes step.

The source level at each step (SourceStepLevel) is automatically calculated as follows:

MeasurePoint = The step point number for a measurement

For example, for a five-point sweep (points = 5), a measurement is performed at MeasurePoint 1, 2, 3, 4,

and 5.

LogStepSize = (log10(stopi) – log10(starti)) / (points – 1)

LogStep = (MeasurePoint – 1) * (LogStepSize)

SourceStepLevel = antilog(LogStep) * starti

Figure 107: SweepILogMeasureV()

starti

= Voltage measurement

stopi

stime

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