Smux.measureyandstep() - Keithley 2651A Reference Manual

Model 2651A High Power System SourceMeter® Instrument Reference Manual

smuX.measureYandstep()

This function performs one or two measurements and then steps the source.
Type TSP-Link accessible
Function Yes
Usage
reading = smuX.measureYandstep(sourceValue)
iReading, vReading = smuX.measureivandstep(sourceValue)
reading
X
Y
sourceValue
iReading
vReading
Details
The smuX.measureYandstep() function performs a measurement and then sets the source to sourceValue.
Usage of the smuX.measureivandstep() function is similar, but performs two measurements simultaneously;
one for current (i) and one for voltage (v).
Measurements are in the following units of measure: v = volts, i = amperes, r = ohms, p = watts.
The specified source value should be appropriate for the selected source function. For example, if the source
voltage function is selected, then sourceValue is expected to be a new voltage level.
Both source and measure autorange must be disabled before using this function. This function cannot be used if
source highC mode is enabled (highC mode requires autoranging to be enabled).
This function is provided for very fast execution of source-measure loops. The measurement will be made prior to
stepping the source. Prior to using this function, and before any loop this function may be used in, set the source
value to its initial level.
Example
local ivalues = {}
smua.source.rangev = 1
smua.source.levelv = 0
smua.measure.rangei = 0.01
smua.source.output = smua.OUTPUT_ON
for index = 1, 10 do
ivalues[index] = smua.measureiandstep(index / 10)
end
ivalues[11] = smua.measure.i()
2651A-901-01 Rev. A / March 2011
Affected by
The measured reading before stepping the source
Source-measure unit (SMU) channel (for example, smua.measurevandstep()
applies to SMU channel A)
SMU measurement function (v = voltage, i = current, r = resistance, p = power)
Source value to be set after the measurement is made
The current reading before stepping the source
The voltage reading before stepping the source
Where saved Default value
This use of the SMU channel A
measure and step function
measures current starting at a
source value of 0 V. After each
current measurement, the source is
stepped 100 mV for the next current
measurement. The final source level
is 1 V, where current is again
measured.
Section 7: Command reference
7-207