Procedure
1.
Connect the lead set to the
HART + pwr
terminals on the Trex unit and to the
transmitter.
Power a 2-wire transmitter
Figure 4-14:
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.
4.7
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.
Loop Diagnostics application
User Guide
137
Summary of Contents for AMS Trex
Page 1: ...User Guide Rev 3 August 2017 AMS Trex Device Communicator User Guide ...
Page 8: ...Contents vi User Guide ...
Page 130: ...Field Communicator application 122 User Guide ...
Page 186: ...Fieldbus Diagnostics application 178 User Guide ...
Page 198: ...Technical specifications 190 User Guide ...
Page 206: ...Glossary 198 User Guide ...
