Power a HART transmitterFigure 4-4:
The Trex unit measures both voltage and current from the HART + pwr terminals. An internal 167 Ohm
resistor is used when the Trex unit powers the device.
CAUTION!
Do not insert a resistor in parallel with either the HART + pwr or HART terminals on the Trex unit, or
in parallel with the device's communication terminals. This will interfere with the current
measurements and may prevent communication.
Measure voltage on an externally-powered HART transmitterFigure 4-5:
A. Voltage source
Loop Diagnostics application
User Guide 131
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