Keithley SourceMeter 2470, User Manual

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Section 6: Measure I-V characteristics of FETs Model 2470 High Voltage SourceMeter Instrument User's Manual
6-18 2470-900-01 Rev. A /
May
2019
Set up the drain family of curves measurement using TSP
commands
The following TSP code uses the trigger model to generate a drain family of curves on a FET using
two 2470s communicating with each other using TSP-Link. The SMU at Node 1 is connected to the
gate and steps voltage from 2 V to 5 V in four steps. The SMU at Node 2 is connected to the drain
and sweeps voltage from 0 V to 5 V with 51 points at each step.
After the code is executed, the measurement results are displayed in the Instrument Console of Test
Script Builder. From the Instrument Console, you can copy the data into a spreadsheet for graphing.
Send the following commands for this example application:
--######################## Settings and TSP-Link setup ################
local gateVstart = 2
local gateVstop = 5
local gateStepSize = 1
local gateIlimit = 1e-3
local drainVstart = 0
local drainVstop = 5
local drainStepSize = 0.1
local drainIlimit = 1e-3
-- Reset the instruments and the TSP-Link connection and clear the buffers.
tsplink.initialize()
reset()
-- If the tsplink state is not online, print an error message and quit.
state = tsplink.state
if state ~= "online" then
print("Error:\n-Check that all SMUs have a different node number")
print("-Check that all SMUs are connected correctly\n")
return
end
-- Set up the TSP-Link node shortcuts.
local gate = node[1]
local drain = node[2]
--######################## Model 2470 #1 (gate) setup ################
-- Set up the source function.
gate.smu.source.configlist.create("stepVals")
gate.smu.source.func = gate.smu.FUNC_DC_VOLTAGE
gate.smu.source.autorange = gate.smu.ON
gate.smu.source.ilimit.level = gateIlimit
-- Set up the measure function.
gate.smu.measure.func = gate.smu.FUNC_DC_CURRENT
gate.smu.measure.autorange = gate.smu.ON
gate.smu.measure.terminals = gate.smu.TERMINALS_REAR
-- Set up TSP-Link triggering.
tsplink.line[1].reset()
gate.tsplink.line[1].mode = gate.tsplink.MODE_SYNCHRONOUS_MASTER
gate.trigger.tsplinkout[1].stimulus = gate.trigger.EVENT_NOTIFY1