Emerson AMS Trex Device Communicator User Manual page 140

Loop Diagnostics application
September 2021
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140
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Procedure
1. Connect the lead set to the HART + pwr terminals on the Trex unit and to the
transmitter.
Figure 4-14: Power a 2-wire transmitter
2. On the Loop Diagnostics screen, tap Trex Unit Power.
3. Tap Power Transmitter.
The Trex unit uses an internal resistor while powering the device.
4. Tap OK.
Loop Diagnostics is now powering the transmitter and measuring voltage and
current.
5. To stop powering the device, do one of the following:
• Tap Trex Unit Power to set the option to Off.
• Tap Exit.
• Remove the lead set from the Trex unit.
Power a 2-wire transmitter and measure
analog output
You can remove a 2-wire HART transmitter from a loop, use the Trex unit to power the
transmitter, and then measure the analog output.
If you try to apply power from the Trex unit when the device is externally-powered, the
Loop Diagnostics application prevents the Trex unit from supplying power. This protects
the Trex unit from damage.
CAUTION
Remove the USB cable from the Trex unit before connecting to a device.
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