Measure voltage on an externally-powered loop

You can use the HART terminals on the Trex unit to measure the voltage on an externally-powered device/loop.

Note: Use the HART + pwr terminals if you want the Trex unit to power the device and measure voltage. See Power a 2-wire transmitter.
Do not connect lead sets to the HART and HART + pwr terminals at the same time.
  1. Connect the lead set to the HART terminals on the Trex unit and to the externally-powered device.
  2. View the Measured Voltage section on the Loop Diagnostics screen.