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Model 2651A High Power System SourceMeter® Instrument User's Manual Section 7: Increasing SMU current sourcing ability

-- Configure 2651A #2 (Drain SMU 2)

-----------------------------------

node[2].smua.reset()

node[2].smua.source.func = node[2].smua.OUTPUT_DCAMPS

node[2].smua.sense = node[2].smua.SENSE_REMOTE

node[2].smua.source.offmode = node[2].smua.OUTPUT_NORMAL

node[2].smua.source.offfunc = node[2].smua.OUTPUT_DCAMPS

node[2].smua.source.offlimitv = 10 -- Set off limit

-- SMU will be a 0A current source with 10V limit when output is turned off

node[2].smua.source.rangei =

math.max(math.abs(dstart / 2), math.abs(dstop / 2))

node[2].smua.source.leveli = 0 -- Sets the DC bias level

node[2].smua.source.limitv = 10 -- Sets the DC bias limit

node[2].smua.measure.nplc = 0.005

node[2].smua.measure.rangev = pulseLimit

node[2].smua.measure.autozero = node[2].smua.AUTOZERO_ONCE

node[2].smua.measure.delay = (pulseWidth -

((1 / node[2].linefreq) * node[2].smua.measure.nplc)) - 20e-6

-- Set the delay so that the measurement is near the end of the pulse

-- Prepare the reading buffers

node[2].smua.nvbuffer1.clear()

node[2].smua.nvbuffer1.collecttimestamps = 1

node[2].smua.nvbuffer1.collectsourcevalues = 1

node[2].smua.nvbuffer1.fillmode = node[2].smua.FILL_ONCE

node[2].smua.nvbuffer2.clear()

node[2].smua.nvbuffer2.collecttimestamps = 1

node[2].smua.nvbuffer2.collectsourcevalues = 1

node[2]. smua.nvbuffer2.fillmode = node[2].smua.FILL_ONCE

-- Configure TSP-Link Trigger 1

node[2].tsplink.trigger[1].clear()

node[2].tsplink.trigger[1].mode = node[2].tsplink.TRIG_FALLING

-- Timer 1 controls the pulse width

node[2].trigger.timer[1].count = 1

node[2].trigger.timer[1].delay = pulseWidth - 3e-6

node[2].trigger.timer[1].passthrough = false

node[2].trigger.timer[1].stimulus =

node[2].smua.trigger.SOURCE_COMPLETE_EVENT_ID

node[2].trigger.timer[1].clear()

-- Configure SMU Trigger Model for Sweep

node[2].smua.trigger.source.lineari(dstart / 2, dstop / 2, dsteps)

node[2].smua.trigger.source.limitv = pulseLimit

node[2].smua.trigger.measure.iv(node[2].smua.nvbuffer1, node[2].smua.nvbuffer2)

node[2].smua.trigger.measure.action = node[2].smua.ENABLE

-- Return the output to the bias level at the end of the pulse/sweep

node[2].smua.trigger.endpulse.action = node[2].smua.SOURCE_IDLE

node[2].smua.trigger.endsweep.action = node[2].smua.SOURCE_IDLE

node[2].smua.trigger.count = dsteps

node[2].smua.trigger.arm.stimulus = 0

node[2].smua.trigger.source.stimulus = node[2].tsplink.trigger[1].EVENT_ID

node[2].smua.trigger.measure.stimulus = 0

node[2].smua.trigger.endpulse.stimulus = node[2].trigger.timer[1].EVENT_ID

node[2].smua.trigger.source.action = node[2].smua.ENABLE

2651A-900-01 Rev. A / March 2011 7-13

Brand	Keithley
Model	2651A
Category	Measuring Instruments
Language	English

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