Keithley 2657A, Справочное руководство, Страница: 411 / 805

Section 7: TSP command reference Model 2657A High Power System SourceMeter® Instrument Reference Manual
7-98 2657A-901-01 Rev. B/December 2012
Details
Output data includes transconductance values, reading buffer with measured voltages, reading buffer with
measured voltages and currents.
If all parameters are omitted when this function is called, this function is executed with the parameters set to the
default values.
The
gm_isweep()
function performs a linear current sweep, measuring voltage and current, and then
calculating the transconductance (Gm) at each point using the central difference method. It can return an array of
Gm values, a reading buffer with the measured voltages, and a reading buffer with the measured currents.
Example
gm_array = gm_isweep(smua, 0, 0.01, 20)
gm_array, vbuf = gm_isweep(smua, 0, 0.01, 20)
gm_array, vbuf, ibuf = gm_isweep(smua, 0,
0.01, 20) Source-measure unit (SMU) A returns Gm
values only.
SMU A returns Gm and reading buffer with
measured voltages.
SMU A returns Gm and reading buffers with
measured voltages and currents.
Also see
gm_vsweep() (on page 7-98)
KIParlib factory script (on page 5-21)
gm_vsweep()
This KIParlib factory script function performs a linear voltage sweep and calculates the transconductance (Gm) at
each point.
Type TSP-Link accessible Affected by Where saved Default value
Function No
Usage
gm_array, ibuf, vbuf
= gm_vsweep(
smu, start_v, stop_v, points
)
gm_array
A Lua table containing the calculated Gm values at each point
ibuf
A reading buffer containing the measured current at each point
vbuf
A reading buffer containing the measured voltage at each point
smu
System SourceMeter
®
instrument channel (set to
smua
)
start_v
Starting voltage level of the sweep
stop_v
Ending voltage level of the sweep
points
Number of measurements between
start_v
and
stop_v
(must be
≥
2)
Details
Output data includes transconductance values, reading buffer with measured currents, reading buffer with
measured currents and voltages.
The
gm_vsweep()
function performs a linear voltage sweep, measuring voltage and current, and then
calculating the transconductance (Gm) at each point using the central difference method. It can return an array of
Gm values, a reading buffer with the measured currents, and a reading buffer with the measured voltages.