Generating Open LCR Compensation Data

Generating open LCR compensation data calculates corrections that you can then apply to your LCR measurements.

Note Complete this process only in the context of the overall compensation process described in Compensating an NI LCR Meter.
Note Before you begin, follow any instructions for preparing your cables in your cable documentation and fully assemble your LCR test setup.

The cable compensation data you apply affects the LCR compensation data you generate with this process. Apply a standard cable compensation or apply custom cable compensation data before performing this process.

Notice Changes to the physical layout and orientation of components of an LCR test system can affect your LCR measurements. Keep the physical layout of all components of your test system as consistent as possible between compensation and test deployment to ensure your compensation is as effective as possible.
Complete the following steps to generate open LCR compensation data:
  1. Leave the circuit open across the test fixture as shown.
    Figure 3. Compensation: Open Setup. Four-terminal pair (4TP) connection scheme shown.

    1378

    1. HI CUR
    2. HI POT
    3. LO POT
    4. LO CUR
    5. Connection between isolated shield conductors
  2. Reconfigure settings related to cable compensation to correspond to the cable compensation you performed, as follows:
    Cable Compensation OptionDescription
    Standard Cable Compensation Set Cable Length to the NI standard option you chose.
    Custom Cable Compensation
    1. Set Cable Length to the custom option you used.
    2. Set LCR Short Custom Cable Compensation Enabled in the same manner it was set when you applied the custom cable compensation.
    3. If you selected Custom (As Configured) for Cable Length, call Configure LCR Custom Cable Compensation and provide the custom cable compensation data you generated for the present point in your program to it.
  3. Call Perform LCR Open Compensation and supply any specific frequencies you want to compensate for.
    This function generates compensation data based on a default set of test frequencies and the additional frequencies you can specify. NI-DCPower interpolates compensation for frequencies other than these frequencies.
    Calling this function writes the open data to the onboard storage of the instrument. Data from only the most recently performed open LCR compensation is recorded in onboard storage.
    Note When you call this function, most NI-DCPower properties in the session are reset to their default values.
  4. Rewrite the values for any session properties that you need to maintain.
  5. Based on how many discrete sets of compensation data your application requires, manage the compensation data.
    Data RequiredDescription
    Single set No action required: onboard storage of the instrument already contains the open data.
    Multiple sets
    1. Measure the complex admittance, Y, of the circuit with Measure Multiple LCR or Fetch Multiple LCR.
    2. Calculate the conductance and susceptance from the complex admittance and keep track of the values.
    3. If relevant to your application, physically reorient your setup for the next compensation point.
    4. Repeat steps 2 through 5 for each discrete set of open LCR compensation data your application requires.
You have now generated open LCR compensation data for your setup. The associated corrections are not yet applied to your measurements.

Once you have completed this process, return to Compensating an NI LCR Meter to continue any other parts of the overall compensation process you want to perform.