Added 2651A and 2657A examples

Including several examples for paralleling SMUs for up to 100A of current, and a script for checking for status model overrruns.

Instrument_Examples/Series_2600/265xA/2651A_-_Power_FET_IGBT_IV_Curves.tsp

@@ -0,0 +1,231 @@
+--[[
+	Title:			IV Curves Example Script
+	Date:			12/23/2010
+	Description:	This script will perform a series of IV Curves on a
+	MOSFET or IGBT device and will return the data in a Microsoft Excel
+	compatible format for graphing and analysis.
+	
+	TSP-Link Configuration:
+	Node 1: 2651A
+	Node 2: 26xxA
+
+	Master Node: Node 1
+
+	Revision History:
+	12/23/2010 - Version 1.01
+	David Wyban
+	• Changed Timer 2 to be triggered from SOURCE_COMPLETE event to avoid
+	  issue with the first pulse in a sweep being shorter than the rest
+	• Added a line to turn on highc mode on the gate SMU for stability
+
+	12/6/2010 - Version 1.0
+	David Wyban
+	Initial Revision
+]]
+
+--[[
+	IV_Curves(gstart, gstop, gsteps, dstart, dstop, dsteps, pulseWidth, pulsePeriod, pulseLimit)
+	
+	Description:	This function will perform a series of pulsed sweeps
+	on a MOSFET or IGBT device to generate a series of IV Curves that
+	characterize the device.  Note: To avoid device	oscillations, a
+	series resistor on the gate terminal of the	device may be required.
+	
+	Parameters:
+		gstart:		The starting voltage of the gate sweep
+		gstop:		The ending voltage of the gate sweep
+		gsteps:		The number of steps in the gate sweep
+		dstart:		The starting voltage of the drain sweep
+		dstop:		The ending voltage of the drain sweep
+		dsteps:		The number of steps in the drain sweep
+		pulseWidth:	The width of the drain pulse in seconds
+		pulsePeriod:The time in seconds between the start of consecutive drain pulses in the sweep
+		pulseLimit:	The current limit in Amps of the drain pulse
+
+	Example Usage:
+		IV_Curves(5, 9, 5, 0, 10, 21, 300e-6, 30e-3, 50)
+--]]
+function IV_Curves(gstart, gstop, gsteps, dstart, dstop, dsteps, pulseWidth, pulsePeriod, pulseLimit)
+	reset()
+	tsplink.reset()
+
+	-- Configure the Drain SMU(2651A)
+	---------------------------------
+	smua.reset()
+	smua.source.func		= smua.OUTPUT_DCVOLTS
+	smua.sense				= smua.SENSE_REMOTE
+
+	smua.source.rangev		= math.max(math.abs(dstart), math.abs(dstop))
+	-- Select the source range that is large enough to fit all values of the sweep
+	smua.source.levelv		= 0 -- Sets the drain bias level
+	smua.source.limiti		= 5
+
+	smua.measure.rangev		= smua.source.rangev
+	smua.measure.rangei		= (pulseLimit == "off") and 50 or pulseLimit
+	-- Select a measure range large enough to fit pulses up to the current limit
+
+	smua.measure.autozero	= smua.AUTOZERO_ONCE
+	smua.measure.nplc		= 0.005
+	-- NPLC can be increased to improve measurement accuracy.
+	-- However, it should remain small enough to fit the measurement
+	-- within the width of the settled part of the pulse.
+	smua.measure.delay		= (pulseWidth - ((1/localnode.linefreq) * smua.measure.nplc)) - 20e-6
+	-- Set the measure delay so that the measurement is
+	-- taken at the end of the pulse before the falling edge
+
+	-- Timer 1 controls the pulse period
+	trigger.timer[1].count			= (dsteps <= 1) and 1 or (dsteps - 1)
+	-- If dsteps <= 1 then use 1 for the count else use dsteps - 1
+	trigger.timer[1].delay			= pulsePeriod
+	trigger.timer[1].passthrough	= true
+	trigger.timer[1].stimulus		= tsplink.trigger[1].EVENT_ID
+	trigger.timer[1].clear()
+
+	-- Timer 2 controls the pulse width
+	trigger.timer[2].count			= 1
+	trigger.timer[2].delay			= pulseWidth - 3e-6
+	trigger.timer[2].passthrough	= false
+	trigger.timer[2].stimulus		= smua.trigger.SOURCE_COMPLETE_EVENT_ID
+	trigger.timer[2].clear()
+
+	-- Configure Drain SMU(2651A) trigger model
+	smua.trigger.source.linearv(dstart, dstop, dsteps)
+	smua.trigger.source.limiti		= pulseLimit
+	smua.trigger.measure.action		= smua.ENABLE
+	smua.trigger.measure.iv(smua.nvbuffer1, smua.nvbuffer2)
+	smua.trigger.endpulse.action	= smua.SOURCE_IDLE
+	smua.trigger.endsweep.action	= smua.SOURCE_IDLE
+	smua.trigger.arm.count			= gsteps
+	smua.trigger.count				= dsteps
+	smua.trigger.arm.stimulus		= 0
+	smua.trigger.source.stimulus	= trigger.timer[1].EVENT_ID
+	smua.trigger.measure.stimulus	= 0
+	smua.trigger.endpulse.stimulus	= trigger.timer[2].EVENT_ID
+	smua.trigger.source.action		= smua.ENABLE
+
+	-- Configure TSP-Link Triggers
+	tsplink.trigger[1].clear()
+	tsplink.trigger[1].mode			= tsplink.TRIG_SYNCHRONOUSM
+	tsplink.trigger[1].stimulus		= smua.trigger.ARMED_EVENT_ID
+	-- TSP-Link Trigger 1 is used by the 2651A to command the 26xxA
+	-- to step the gate and for the 26xxA to report to the 2651A
+	-- that it has completed the step.
+
+	tsplink.trigger[2].clear()
+	tsplink.trigger[2].mode			= tsplink.TRIG_FALLING
+	tsplink.trigger[2].stimulus		= smua.trigger.SWEEP_COMPLETE_EVENT_ID
+	-- TSP-Link Trigger 2 is used by the 2651A to command the 26xxA that
+	-- it has completed the drain sweep and that the 26xxA continue.
+
+	-- Prepare the Drain SMU (2651A) reading buffers
+	smua.nvbuffer1.clear()
+	smua.nvbuffer1.collectsourcevalues	= 1
+	smua.nvbuffer2.clear()
+	smua.nvbuffer2.collectsourcevalues	= 1
+
+
+	-- Configure the Gate SMU(26xxA)
+	--------------------------------
+	node[2].smua.reset()
+	node[2].smua.source.func		= node[2].smua.OUTPUT_DCVOLTS
+	node[2].smua.sense				= node[2].smua.SENSE_REMOTE
+	node[2].smua.source.levelv		= 0
+	node[2].smua.source.limiti		= 100e-3
+	node[2].smua.measure.delay		= 300e-6	-- Give gate 300us to settle
+	-- Do not need to configure any additional measure settings.
+	-- Timing is not critical on the gate so autorange will do.
+
+	node[2].smua.source.highc		= 0
+	-- If you find the gate to be unstable even with a gate resistor in place
+	-- changing highc to 1 can improve stability.
+
+	-- Configure Gate SMU(26xxA) Trigger Model
+	node[2].smua.trigger.source.linearv(gstart, gstop, gsteps)
+	node[2].smua.trigger.source.limiti		= 100e-3
+	node[2].smua.trigger.measure.action		= node[2].smua.ENABLE
+	node[2].smua.trigger.measure.iv(node[2].smua.nvbuffer1, node[2].smua.nvbuffer2)
+	node[2].smua.trigger.endpulse.action	= smua.SOURCE_HOLD
+	node[2].smua.trigger.endsweep.action	= smua.SOURCE_IDLE
+	node[2].smua.trigger.count				= gsteps
+	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].tsplink.trigger[2].EVENT_ID
+	node[2].smua.trigger.source.action		= smua.ENABLE
+
+	-- Configure Model 26xxA TSP-Link Triggers
+	node[2].tsplink.trigger[1].clear()
+	node[2].tsplink.trigger[1].mode			= node[2].tsplink.TRIG_SYNCHRONOUSA
+	node[2].tsplink.trigger[1].stimulus		= node[2].smua.trigger.MEASURE_COMPLETE_EVENT_ID
+
+	node[2].tsplink.trigger[2].clear()
+	node[2].tsplink.trigger[2].mode			= node[2].tsplink.TRIG_FALLING
+
+	-- Prepare the Gate SMU (26xxA) reading buffers
+	node[2].smua.nvbuffer1.clear()
+	node[2].smua.nvbuffer1.collectsourcevalues	= 1
+	node[2].smua.nvbuffer2.clear()
+	node[2].smua.nvbuffer2.collectsourcevalues	= 1
+
+	-- The SMUs are configured and ready to run the test
+
+	-- Outputs on
+	node[2].smua.source.output		= 1	
+	smua.source.output				= 1
+
+	-- Start the 26xxA's trigger model
+	node[2].smua.trigger.initiate()
+
+	-- Start the 2651A's trigger model
+	smua.trigger.initiate()
+
+	waitcomplete()	-- Wait until the sweeps are complete	
+
+	-- Outputs off
+	smua.source.output				= 0	
+	node[2].smua.source.output		= 0
+
+	-- Return the data
+	PrintIVcurveData(gsteps, dsteps)
+end
+
+
+--[[
+	PrintIVcurveData(gsteps, dsteps)
+	
+	Description:	This function will output the data collected by
+	the IV_Curves() function in a Microsoft Excel compatible format.
+	For each step of the gate, this function will output three
+	columns containing the drain sweep data as well as the gate data
+	in the first row.
+	
+	Parameters:
+		gsteps:	The number of steps in the gate sweep
+		dsteps:	The number of steps in the drain sweep
+
+	Example Usage:
+		PrintIVcurveData(5, 21)
+--]]
+function PrintIVcurveData(gsteps, dsteps)
+	line1 = ""
+	line2 = ""
+	for i = 1,gsteps do
+		line1 = line1 .. string.format("Vgs = %0.2f\t%g\t%g\t",
+							node[2].smua.nvbuffer1.sourcevalues[i],
+							node[2].smua.nvbuffer2[i],
+							node[2].smua.nvbuffer1[i])
+		line2 = line2 .. "Source Value\tVoltage\tCurrent\t"
+	end
+	print(line1)
+	print(line2)
+	for i = 1, dsteps do
+		line = ""
+		for j = 1, gsteps do
+			line = line .. string.format("%g\t%g\t%g\t",
+							smua.nvbuffer1.sourcevalues[(j - 1) * dsteps + i],
+							smua.nvbuffer2[(j - 1) * dsteps + i],
+							smua.nvbuffer1[(j - 1) * dsteps + i])
+		end
+		print(line)
+	end
+end