Keithley 2470 User Manual

Model 2470
High Voltage SourceMeter Instrument User's Manual Section 6: Measure I-
V characteristics of FETs
2470-900-01 Rev. A / May 2019 6-11
SMU 2
:
INIT
*WAI
 Initiate the trigger model.
 Wait for the model to complete.
Pseudocode
vds = []
ids = []
for i = 2, 5 do:
 Create an empty array to hold
measured voltage values.
 Create an empty array to hold
measured current values.
 Set up a for loop from 2 to 5
(including 5).
Pseudocode
for SMU2
vds[i-1] = TRAC:DATA? 1 + 51*(i-2),
51*(i-1), "defbuffer1", SOUR
ids[i-1] = TRAC:DATA? 1 + 51*(i-2),
51*(i-1), "defbuffer1", READ
 Save the sourced and measured
values to the arrays vds and ids,
respectively. The readings from
each step are saved at each index
in the array.
Pseudocode
end for
 End the
for
loop.
Set up the application using SCPI commands in a linear sweep
In this example, the gate voltage steps from 2 V to 6 V in 1 V steps, the drain voltage sweeps from
0 V to 5 V in 51 steps, and the drain current is measured. The application retrieves each of 51
readings and source values from defbuffer1 and saves them in the arrays vds and ids,
respectively.
You send commands to either the sweeper (SMU 2) or the stepper (SMU 1). In the table, the
commands for the sweeper are shown with a light gray background. The commands for the stepper
are shown with a darker gray background. The light-brown shaded code represents pseudocode that
will vary depending on the programming environment you use. Each bulleted item in the Description
column describes a single line of code in the Commands column.
Send the following commands for this application:
SMU 1,
SMU 2, or
pseudocode
Commands Description
SMU 1
*RST
:SENS:FUNC "CURR"
:SENS:CURR:RANG:AUTO ON
:ROUT:TERM REAR
:SOUR:FUNC VOLT
:SOUR:VOLT:RANG 20
 Reset the instrument.
 Set to measure current.
 Set to measure with autorange
enabled.
 Set to use rear terminals.
 Set to source voltage.
 Set to 20 V source range.

Keithley 2470 Specifications

General

Brand	Keithley
Model	2470
Category	Power Supply
Language	English