Power Measurements

Each channel of the PXIe-4139 has two synchronized ADCs that measure voltage and current. You can use NI-DCPower to measure power flowing to or from the PXIe-4139.

You can use the following VIs and functions to measure both current and voltage for both channels of the PXIe-4139.

  • niDCPower Measure Multiple VI or niDCPower_MeasureMultiple function
  • niDCPower Fetch Multiple VI or niDCPower_FetchMultiple function

Power can be computed as the product of the voltage and the current. If the power measurement is positive, the PXIe-4139 is sourcing power. If the power measurement is negative, the PXIe-4139 is sinking power.