Section 7: Increasing SMU current sourcing ability Model 2651A High Power System SourceMeter® Instrument User's Manual
The following script contains all the code necessary to perform an Rds(on) sweep up to 100 A using
two Model 2651A High Power System SourceMeter
®
Instruments and a Series 2600A System
SourceMeter
®
Instrument. This script:
• Initializes the TSP-Link
®
connection
• Configures the source-measure units (SMUs)
• Configures the trigger models of the two Model 2651A instruments
• Prepares the reading buffers
• Executes the test
• Stores the collected data in a format that can be copied from the instrument console and pasted
into a Microsoft
®
Excel
®
spreadsheet.
The script is written using Test Script Processor (TSP
®
) functions rather than as a single block of
inline code. TSP functions are similar to functions in other programming languages, such as
Microsoft
®
Visual C
®
or Visual Basic
®
, and must be called before the code contained in them is
executed. Because of this, running the script alone will not execute the test. To execute the test, run
the script to load the functions into test script memory and then call the functions. Refer to the
documentation for Test Script Builder or TSB Embedded for directions on how to run scripts and enter
commands using the instrument console.
The script contains comments that describe what is being performed by the lines of code and
document the functions in the script. Lines starting with node[2]. are commands that are being sent
to Model 2651A on node 2 through the TSP-Link interface. Lines starting with node[3]. are
commands that are being sent to the Series 2600A through the TSP-Link interface. All other
commands are executed on the master Model 2651A on node [1].
--[[
Title: Combining SMUs for 100A Example
Description: This script is designed to perform an Rds(on)sweep on a power
MOSFET device. It combines two 2651A SMUs in parallel to perform a current
sweep up to 100A. Data collected from the sweep is then returned in a
Microsoft Excel compatible format for plotting and analysis.
Equipment needed:
2x 2651A
1x 26xxA
2x TSP-Link Cable
TSP-Link Configuration:
-----------------------
Unit | Node #
2651A #1 | 1
2651A #2 | 2
26xxA | 3
Master Node (PC Interface): Node 1
]]
7-10 2651A-900-01 Rev. A / March 2011
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