Keithley 2651A Reference Manual page 345

Model 2651A High Power System SourceMeter® Instrument Reference Manual
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
LogStepSize = (log10(stop) - log10(start)) / (points -1)
LogStep = (n - 1) * (LogStepSize), where n = [1, points]
n
SourceStepLevel
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.
LogStepSize = (log10(stop) - log10(start)) / (points - 1)
LogStep
SourceStepLevel
bias level
Example
ConfigPulseVMeasureISweepLog(smua, 0, 1,
10, 1, 10e-3, 20e-3, 10,
smua.nvbuffer1, 6)
Also see
InitiatePulseTest()
2651A-901-01 Rev. A / March 2011
= antilog(LogStep
n
Figure 103: ConfigPulseVMeasureISweepLog()
= (n - 1) * (LogStepSize)
n
= antilog (LogStep
n
LogStep
start
Measurement (1/NPLC seconds)
Pulse initiated here
Last source value before pulse train was initiated
(on page 7-97)
volts larger than the previous pulse, where:
n
) * start
n
where: n = [ 1, points]
) * start
n
LogStep
2
ton toff
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.
Section 7: Command reference
stop
3
7-37