Keithley 2657A User Manual

Section 7: TSP command reference Model 2657A High Power System SourceMeter® Instrument Reference Manual
7-38 2657A-901-01 Rev. B/December 2012
Details
Data for pulsed voltage measurements are stored in the reading buffer specified by the buffer input parameter.
This function configures a logarithmic pulsed current sweep with a voltage measurement at each point.
Measurements are made at the end of the ton time.
The magnitude of the first pulse will be start amperes; the magnitude of the last pulse will be stop amperes.
The magnitude of each pulse in between will be LogStep
n
amperes larger than the previous pulse, where:
LogStepSize = (log10(stop) - log10(start)) / (points -1)
LogStepn = (n - 1) * (LogStepSize), where n = [1, points]
SourceStepLeveln = antilog(LogStepn) * 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 can be achieved, and if they can, assigns the indicated tag or index to the pulse train.
Figure 111: ConfigPulseIMeasureVSweepLog()
Example
ConfigPulseIMeasureVSweepLog(smua, 0,
1e-3, 0.01, 100, 10e-3, 100e-3,
10, smua.nvbuffer1, 5)
Set up a pulsed logarithmic sweep that uses System
SourceMeter
®
instrument channel A. The pulsed
sweep will start at 1 mA, end at 10 mA, and return to
a 0 A bias level between pulses. Each pulsed step
will be on for 10 ms, and then at the bias level for 100
ms. The voltage limit will be 100 V 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 5.
Also see
InitiatePulseTest() (on page 7-102)
KIPulse factory script
(on page 5-20)
Pulse initiated here
bias
toff
start
stop
Measurement (1/NPLC seconds)
LogStep
2
ton
Last source value before pulse train was initiated
LogStep
3

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English