Dsweepv - Keithley 4200A-SCS Reference Manual

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Section 13: LPT library function reference

dsweepv

This command performs a dual linear staircase voltage sweep.

int dsweepv(int instr_id, double startv, double stopv, long numSteps, double

This command is used to perform a dual staircase sweep (see the figure below). The linear step size

to sweep is set using the startv, stopv, and NumSteps parameters. The linear step size for the

sweep is then calculated as follows:

StepSize (in volts) = (stopv – startv) / (numSteps)

numSteps describes the first half of the sweep. For example, to do a dual sweep from 1 V to 10 V

and back down in 1 V steps, set numSteps to 10. The result is a 20-point sweep (10 up and 10

The first sweep can step forward (low voltage to high voltage) or it can step in reverse (high voltage to

low voltage). After performing the first sweep, the second sweep will repeat in the reverse direction.

For example, if configured to sweep from 1 V to 10 V, the second sweep will start at 10 V and step

down to 1 V.

The delayTime parameter sets the delay that occurs before each measurement. Note that there is

an inherent system overhead delay on each step of the sweep.

Use the setfreq and setlevel commands to set the AC drive frequency and voltage for the

Use the sweepv command to perform a single linear staircase voltage sweep.

The instrument identification code of the 4210-CVU: CVU1

Initial force value for the sweep (−30 V to 30 V)

Final force value for the first sweep (−30 V to 30 V)

Sets the number of points in the sweep (1 to 4096); see Details

Delay before each measurement (0 to 999 s)

Model 4200A-SCS Parameter Analyzer Reference Manual

4200A-901-01 Rev. C / February 2017