Keithley 2657A User Manual

Section 7: TSP command reference Model 2657A High Power System SourceMeter® Instrument Reference Manual
7-326 2657A-901-01 Rev. B/December 2012
Example
SweepILogMeasureV(smua, 0.01, 0.1,
0.001, 5)
This function performs a five-point linear current sweep
starting at 10 mA and stopping at 100 mA. Voltage is
measured at every step (point) in the sweep. The source is
allowed to settle on each step for 1 ms before a
measurement is performed.
The following table contains log values and corresponding
source levels for the five-point logarithmic sweep:
MeasurePoint LogStepSize LogStep SourceStepLevel
1 0.25 0.0 0.01 A
2 0.25 0.25 0.017783 A
3 0.25 0.5 0.031623 A
4 0.25 0.75 0.056234 A
5 0.25 1.0 0.1 A
Also see
KISweep factory script (on page 5-19)
SweepVLinMeasureI()
This KISweep factory script function performs a linear voltage sweep with current measured at every step (point).
Type TSP-Link accessible
Affected by Where saved Default value
Function No
Usage
SweepVLinMeasureI(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 linear 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 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 stopv amperes step.
The linear step size is automatically calculated as follows:
step = (stopv – startv) / (points – 1)

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English