Keithley 2657A User Manual

Section 7: TSP command reference Model 2657A High Power System SourceMeter® Instrument Reference Manual
7-100 2657A-901-01 Rev. B/December 2012
i_leakage_measure()
This KIHighC factory script function performs a current leakage measurement after stepping the output voltage.
Type TSP-Link accessible
Affected by Where saved Default value
Function No
Usage
imeas = i_leakage_measure(smu, levelv, limiti, sourcedelay, measurei, measuredelay)
imeas
The measured current
smu
System SourceMeter
®
instrument channel (set to smua)
levelv
Voltage level to step to when this function is called
limiti
Current limit setting for the voltage step
sourcedelay
Delay to wait before lowering the current limit for measurement
measurei
Current limit (and measure range); note the current limit is lower at this level and
because high-capacitance mode is active, the measure range will follow
measuredelay
Delay to wait after lowering the current limit before taking the measurement
Details
This function causes the smu to:
• Change its current limit to limiti with a voltage output of levelv for sourcedelay time, and then
changes its current limit to measurei (that also changes the measurement range to measurei) for
measuredelay time
• When measuredelay time expires, a measurement is taken and returned as imeas.
When measuring leakage current:
• Charge the capacitor before calling this function (the instrument's output is usually at a nonzero voltage
before calling this function; when measuring leakage, this function does not charge the capacitor).
• Set levelv = 0
Example
smua.source.highc = smua.ENABLE
smua.source.levelv = 500
smua.source.output = smua.OUTPUT_ON
delay(1)
imeas = i_leakage_measure(smua, 0, 20e-3,
500e-3, 10e-6, .1)
Enable high-capacitance mode. Charge the
capacitor at 500 V for 1 second set by
delay(1).
The parameters passed on to the
i_leakage_measure() function in this
example are:
smu = smua
levelv = 0 V
limiti = 20 mA
sourcedelay = 500 ms
measurei = 10 μA range
measuredelay = 100 ms
The actual levels and delays depend on the
value and type of capacitor used.
Also see
i_leakage_threshold() (on page 7-101)
KIHighC factory script
(on page 5-21)

Keithley 2657A Specifications

General

Brand	Keithley
Model	2657A
Category	Measuring Instruments
Language	English