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

2651A-901-01 Rev. A / March 2011 7-331

Usage

SweepVLogMeasureI(smu, startv, stopv, stime, points)

smu

System SourceMeter

instrument channel (set to smua)

startv

Sweep start voltage in volts

stopv

Sweep stop voltage in volts

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 current measurements, voltage 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 voltage sweep with current measured at every step (point):

1. Sets the smu to output startv amperes, allows the source to settle for stime seconds, and then

performs a current measurement.

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

then performs a current measurement.

3. Repeats the above sequence until the voltage is measured on the stopv volts 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) * startv

Figure 109: SweepVLogMeasureI()

startv

= Current measurement

stopv

stime

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