Data is Noisier Than Expected When Using PXIe-4144/4145 CurrentLimitAutorange

Updated Jul 29, 2025

Reported In

Hardware

  • PXIe-4144
  • PXIe-4145

Issue Details

When I use CurrentLimitAutorange, I get a lot of noise and it behaves as if CurrentLimit and CurrentLimitRange to the maximum values. If I manually set CurrentLimit and CurrentLimitRange to very small values, I get the noise I expect.

Solution

The confusion here is that the CurrentLimitAutorange property is not the same as Measurement:Autorange property. CurrentLimitAutorange looks at the specified current limit and picks the smallest current range that is sufficiently large to handle that limit, so for example if you set a 5mA limit on a device that had 1mA, 10mA and 100mA ranges the hardware would operate in the 10mA range but it would not change ranges dynamically based on how much current is flowing at any particular time (that is what Measurement:Autorange does).

The PXIe-4144/4145 doesn't support Measurement:Autorange: Properties Supported by the PXIe-4144/4145 

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