Figure 4-6: Power and control current to a positioner
The Trex unit measures both voltage and current from the HART + pwr terminals.
Figure 4-7: Connect to an externally-powered positioner in-parallel
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
User Guide Loop Diagnostics application
September 2021
User Guide 135
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