Purpose: Find the optimum current range required to make a current measurement.

This function takes into account the measurement frequency, because a higher-than-normal current range is required at high frequencies. It also considers the maximum estimated voltage to avoid very large common-mode voltages. The actual current range is not changed.

Usage: IRange = Pstat.TestIERangeAC(Iac, Eac, Idc, Edc, Frequency)

  Iac REAL

Maximum absolute AC current.

  Eac REAL Maximum absolute AC voltage.
  Idc REAL Maximum absolute DC current.
  Edc REAL Maximum absolute DC voltage.
  Frequency REAL Measurement frequency.
  Range INDEX Resulting suggested current range.

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