In a 4-wire WYE-to-WYE (full) configuration, the Neutral
terminal on the NI 9242 measures the neutral-to-ground voltage
through the bottom transformer. You can use a lower ratio
transformer due to the typically low voltages on the Neutral
terminal. Ensure that you scale each NI 9242 channel reading
with the corresponding transformer ratio.
NI 9242 Getting Started Guide
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© National Instruments
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