Skip to content

SMU output on#

The test sources a voltage or current on the SMU output.

Description#

Sets the specified parameters in the SMU and then switches the output on in order to source a voltage or a current (depending on the Mode parameter). To perform a measurement add a SMU output measure test after the SMU output on test. To switch the output off add a SMU output off test after the SMU output measure test.

Input parameters#

Parameter Description
Device The smu whose output is switched
Mode The mode in which the SMU operates. Either Voltage for voltage source mode or Current for current source mode
Level [V/A] The level of the SMU. Depending on the Mode the level is in Volts or Amps
Range The range of the SMU. Either Auto or Fixed. *
Limit [A/V] The limit of the current or voltage output depending on the Mode

* Depending on the Mode parameter the fixed range is determined as follows (if the SMU supports the parameter):

Mode Parameter Value
Voltage Current source range Limit
Voltage Current measure range Limit
Voltage Voltage measure range Level
Current Voltage source range Limit
Current Voltage measure range Limit
Current Current measure range Level

Supported devices#

The following devices are supported by this test:

  • Keithley 2600 series SMU
  • Keithley 2400 series SMU
  • Keithley 2400 Graphical Series SMU
  • Keysight B2900B series SMU
  • Rigol DP 800 power supply
  • iseg EH series power supply

Example#

Goal:

Perform a voltage and current measurement to determine the resistance of a connected DUT.

flowchart LR
    A[SMU output on]--> B
    B[SMU output measure] --> C
    C[SMU output off]

Hardware setup:

Connect a supported SMU to the computer running Measmatic over TCP/IP. 

flowchart LR
    A(Measmatic) o---o |TCP/IP| B(SMU)

In the device manager add the SMU to the current test site configuration. Change the name, the IP address in the device properties of the device.

Connect a 100 ohm resistor between the high and low force and sense terminal (4 wire) of the SMU.

Measmatic setup:

  1. Add a SMU output on test to the test sequence by dragging and dropping a SMU output on test from the test picker into the test sequence. Set the Device in the SMU output on test to be the SMU added in the device manager. Set the Mode to Voltage, Level to 1V, Limit to 100mA, Range to Fixed and enable 4 wire option.
  2. Also add a SMU output measure test to the sequence after the SMU output on test and set the Device to the SMU.
  3. Add a Formula to SMU output measure test by going to the Output tab and clicking on the Add new formula button under the Calculations section. Change the name to Resistance and enter the following formula: Voltage / Current .
  4. Finally, the SMU output off test must be added to the test sequence after the SMU output measure test. Set the Device to the SMUs.
  5. Execute the test sequence by pressing the Run all tests button.

Under the Output tab of the SMU output measure test you will see the measured voltage, current and the calculated resistance.

See also: