NI-9244 Line to Line Measurement Gives Incorrect Value

Updated Jun 5, 2018

Reported In

Hardware

  • NI-9244

Other

NI-9244

Issue Details

I am following the connection diagram found on the Getting Started Guide for a Line to Line Measurement, but I am having an incorrect or unexpected measurement.

Solution

As seen on page 24 of the Geting Started Guide, to convert a Line-Neutral Measurement to a Line-Line Measurement, you need to calculate the difference between the analog input channel's readings.

Additional Information

This behavior is due to the internal connection of this device, which takes measurements respect to an internal reference, as seen in page 4 of the NI-9244 Datasheet.
 

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