Keithley 2651A Reference Manual

Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 7: Command reference
2651A-901-01 Rev. A / March 2011 7-37
Details
Data for pulsed current measurements are stored in the reading buffer specified by the buffer input parameter.
Configures a logarithmic pulsed voltage sweep with a current measurement at each point. Measurements are
made at the end of the ton time.
The magnitude of the first pulse will be start volts; the magnitude of the last pulse will be stop volts. The
magnitude of each pulse in between will be LogStep
n
volts larger than the previous pulse, where:
LogStepSize = (log10(stop) - log10(start)) / (points -1)
LogStep
n
= (n - 1) * (LogStepSize), where n = [1, points]
SourceStepLevel
n
= antilog(LogStep
n
) * start
This function does not cause the specified smu to output a pulse train. It simply checks to see if all of the pulse
dimensions are achievable, and if they are, assigns the indicated tag or index to the pulse train. The
InitiatePulseTest(tag)function is used to initiate a pulse train assigned to a valid tag.
Figure 103: ConfigPulseVMeasureISweepLog()
Pulse initiated here
bias
level
toff
start
stop
Measurement (1/NPLC seconds)
ton
Last source value before pulse train was initiated
LogStepSize = (log10(stop) - log10(start)) / (points - 1)
LogStep
n
= (n - 1) * (LogStepSize) where: n = [ 1, points]
SourceStepLevel
n
= antilog (LogStep
n
) * start
LogStep
2
LogStep
3
Example
ConfigPulseVMeasureISweepLog(smua, 0, 1,
10, 1, 10e-3, 20e-3, 10,
smua.nvbuffer1, 6)
Set up a pulsed logarithmic sweep that will use
SourceMeter instrument channel A. The pulsed
sweep will start at 1 V, end at 10 V, and return to a
0 V bias level between pulses. Each pulsed step will
be on for 10 ms, and then at the bias level for 20 ms.
The current limit will be 1 A during the entire pulsed
sweep. The pulse train will be comprised of 10 pulsed
steps, and the pulse train will be assigned a tag
index of 6.
Also see
InitiatePulseTest() (on page 7-97)

Keithley 2651A Specifications

General

Brand	Keithley
Model	2651A
Category	Measuring Instruments
Language	English