Keithley Series 2600 User Manual

A-51
APPENDIX A
Scripts
l_vgs[l_i] = smub.measure.v() --Measure Vgs
l_id[l_i] = smua.measure.i() --Measure Id
l_vgssource_val = l_vgssource_val + l_vgsstep --Calculate new source value
if (l_i == l_vgssteps) then --Reinitialize voltage value after last
iteration
l_vgssource_val = l_vgsstart
end --if
smub.source.levelv = l_vgssource_val --Increment source
end --for
smua.source.output = smua.OUTPUT_OFF --Disable output
smub.source.output = smub.OUTPUT_OFF --Disable output
smua.source.levelv = 0 --Return source to bias level
smub.source.levelv = 0 --Return source to bias level
Print_Data(l_vds_bias, l_vgssteps, l_vgs, l_id)
end--function Transconductance()
function Print_Data(vdsbias, vgssteps,vgs, id)
--Calculate Gfs value and print data to output queue
--Local Variables
local l_vds_bias = vdsbias --Vds bias value
local l_vgs_steps = vgssteps --Number of steps in Vgs sweep
local l_vgs = vgs --Gate-source Voltage data
local l_id = id --Drain-source current data
local l_gfs = {} --Table for Transconductance calculations
local l_i = 1 --Iteration variable
--Calculate gfs values and populate table
for l_i = 1,l_vgs_steps do
if (l_i ~= 1) then --If not the first iteration, calculate gfs
l_gfs[l_i] = (l_id[l_i] - l_id[l_i - 1])/(l_vgs[l_i] - l_vgs[l_i - 1])
--gfs = dId/dVgs
end--if
end --for
l_i = 1 --Reinitialize Vgs iteration variable

Keithley Series 2600 Specifications

General

Model	Series 2600
Measurement Functions	Voltage, Current, Resistance, Power
Resolution	Up to 6.5 digits
Current Source Range	Up to 10A
Communication Interfaces	GPIB, USB
Applications	Semiconductor testing
Category	Source Measure Unit (SMU)
Channels	Single or Dual Channel (varies by model)