Running Multiple EIS Tests with Multiple SMUs Simultaneously

You can run EIS tests with the same parameters on up to four SMUs simultaneously. To create a Cole-Cole plot and view the results of multiple EIS tests, run the EIS Test Multi Session with Plot VI.

Each SMU has one channel, so you can run up to four EIS tests simultaneously using EIS Test Multi Session with Plot VI.
Before you begin, create a compensation file for the EIS tests. If you plan to use a configuration file, create a configuration file.

Equipment

  • PXIe-4139 (40 W) or PXIe-4139 (20 W)
  1. Use the NI Example Finder to open EIS Test Multi Session with Plot VI.
    1. In the LabVIEW window, select Help » Find Examples.
      The NI Example Finder window loads.
    2. Select Toolkits and Modules » Battery Cell Quality » EIS Test Multi Session with Plot.vi.
      The front panel of the VI loads.
  2. On the front panel of the VI, select up to four SMUs from the HW Resource Name and Channels controls.
  3. Optional: If you want the SMUs to perform self-calibration, enable self-calibration on the front panel.
    Enable or disable self-calibration for each SMU running an EIS test.
    Notice Before allowing self-calibration, NI recommends disconnecting the DUT. Self-calibrating a connected DUT may damage your equipment or lead to inaccurate data.
  4. Enter EIS Test Parameters.
    OptionDescription
    Enter test parameters on the front panel of the VI.
    1. Configure the Frequency Sweep Characteristics. Each entry on the Frequency Sweep Characteristics array defines the parameters that the VI uses to generate a sine wave. Refer to Configuring the Frequency Sweep Characteristics for EIS Measurements for more information about each parameter.
      1. Select the number of tests.
      2. Select the Frequency (Hz). The number of arrays you select limits the frequency.
      3. Select the Current Amplitude (A).
      4. Select the Number of Periods.
    2. Select the Voltage Limit Hi (V).
    3. Select the Nominal DUT Voltage (V).
    4. Select the Compensation Method.
    5. Select the Power Line Frequency.
    Modify the block diagram of the EIS Test Multi Session with Plot VI to obtain test parameters using a configuration file.
    1. Locate Obtain Test Parameters on the block diagram.
    2. Change the Test Parameters Source In enum to File.
    3. Right-click the file path (use dialog) path control and select Browse for Path.
    4. Navigate to the location for the configuration file you created and select the configuration file.
  5. Click Run.
After running the VI, view the following results for each EIS test:
  • Cole-Cole plot—The impedance values at different frequencies.
    • The x-axis represents the real part of the impedance, which is the resistance.
    • The y-axis represents the imaginary part of the impedance, which is the reactance.
  • EIS run time—The measurement run time for each SMU.