Power and control current to a positionerFigure 4-6:
The Trex unit measures both voltage and current from the HART + pwr terminals.
Connect to an externally-powered positioner in-parallelFigure 4-7:
The Trex unit measures voltage from the HART terminals. Voltage measurements can be taken at various
points to identify voltage drops along the loop.
A. Current source
Loop Diagnostics application
132 User Guide
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