Remote Control Of Fet Testing Using Tsp Commands - Tektronix Keithley SourceMeter 2450 User Manual

Section 7: Measuring I-V characteristics of FETs
SMU 1,
SMU 2, or
pseudocode
SMU 1
Pseudocode
SMU 2
Pseudocode
Pseudocode
for SMU 2
Pseudocode end for
SMU 1

Remote control of FET testing using TSP commands

The two example sequences of Test Script Processor (TSP
a drain family of curves on a FET using two 2450 instruments. One of the examples uses the trigger
model to generate the family of curves. The other example uses a linear sweep. You may need to
make modifications for operation in your programming environment.
The following TSP code is designed to be run from Keithley Instruments Test Script Builder (TSB).
TSB is a software tool that is available from tek.com/keithley. You can install and use TSB to write
code and develop scripts for TSP-enabled instruments. Information about how to use TSB is in the
online help for TSB and in the "Introduction to TSP operation" section of the Model 2450
Reference Manual.
To use other programming environments, you may need to make changes to the example TSP code.
By default, the 2450 uses the SCPI command set. You must select the TSP command set before
sending TSP commands to the instrument.
To enable TSP commands:
1. Press the MENU key.
2. Under System, select Settings.
3. Set the Command Set to TSP.
4. At the prompt to reboot, select Yes.
7-10
Commands
:SOUR:VOLT i
delay(0.5)
:INIT
*WAI
Read output queue
vds[i-1]=TRAC:DATA? 1, 51,
"defbuffer1", SOUR
ids[i-1]=TRAC:DATA? 1, 51,
"defbuffer1", READ
:OUTP OFF
Model 2450 SourceMeter® Instrument User's Manual
Description

Set the source level to the iteration
number of the loop.

Delay for 500 ms to allow for settling.

Trigger the sweep to start.

Wait for the operations to complete.

Wait for sweep to complete.

Receive each of 51 readings and
source values from the buffer and
save them in the arrays vds and ids,
respectively. The arrays start at index
one. Each point in the arrays contains
a list of values for each gate voltage.

End the for loop.

Turn the output off. NOTE: All of the
source and measure values can be
returned from the arrays vds and
ids.
®
) commands for this application generate
2450-900-01 Rev. E / August 2019