Fluke 1738/B - Single Phase IT; Split Phase

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Users Manual
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Single Phase IT
The logger has a galvanic isolation between the voltage inputs and
ground based signals like USB and mains input.
Example: Used in Norway and in some hospitals. This would be the
connection at a branch circuit.
Energy Study
Load Study (no voltage measurement)
Split Phase
Example: A North American residential installation at the service
entrance.
Energy Study
Load Study (no voltage measurement)